Cotton aphid damage symptoms: cotton aphid inserted into the back of the cotton leaf or the tender part of the tissue sucking juice, the affected leaves curled to the back, the surface of the leaves is honeydew (greasy) excreted by aphids, and often mold. After cotton damage, the plants were short, the leaves became smaller, the number of leaves decreased, the roots shortened, the buds were postponed, the number of buds and bells decreased, and the bolls were delayed.
Control methods: 1, pesticide control. Soak the seeds with phorate, use 1kg of 75% phorry emulsifiable concentrate per 100 kg of dry cotton, pour 50 liters of warm water from 55 °C to 60 °C into the cement mixing tank, pour in the medicinal product, and then pour the cotton into the mixing. After the drug is sucked dry, the shovel can be shovel for 24 hours, and then it can be sown; phoxim, omethoate spray; use dioxin to kill scorpion.
Symptoms of red bollworm: 1, bud, flower damage. Break in from the top of the flower bud, leaving a large hole in the needle tip. The larvae eat the stamens in the buds, and some of the buds are eaten and shed. Some do not fall off and still flower, but the flowers are poorly developed and some of the petals stick and twist. 2, Qingling was killed. Intrusion from the base, the pupil is healed soon, and irregular protrusions are formed on the inner wall of the bell shell. Older green bells are damaged, and there are worms on the inner wall of the shell. The larvae invade and eat cottonseed. The murdered cotton boll was soaked by rain and the bell chamber became a deadlock. 3. Seeds are killed. The kernels are eaten and become empty shells with wormholes.
Control method: chemical control. The hydrolysin is 2.5% mu active ingredient 0.5g ~ 1g, the kungfu chrysanthemum is 1g per acre, and the carbaryl is diluted 1:250 times.
Helicoverpa armigera damage symptoms: 1, the second generation (buds and buds) is harmful. The larvae of the growing point damage the leaflet buds around the center of the heart into a nick, with fine worms, and the leaves are deformed after unfolding; the growth point is often destroyed, causing the top of the cotton stem to stop growing, growing from the top of the leaf stalks at the top. The long branches, which are basically not long flower buds, make the whole cotton become light stalk cotton with only long leaves and stalks, which is commonly known as "public cotton". The top tender leaves were eaten into many small perforations.
Lei was killed. The larvae are hidden in the eucalyptus leaves for feeding young buds, and there are worms at the pupils; the buds of the buds are opened and quickly fall off.
The flower was killed. The stamens and styles of the flowers are eaten; the base of the ovary is intruded, and the flowers are often not ringing.
2. The third and fourth generations (the bell period) are harmful. There is a pupil at the base of the cotton boll, and there is worm feces near the orifice. Most of the larvae that are foraging are exposed outside the bell; the mottled boll is easy to be sore and shed when it is raining, and the damaged part that does not fall off becomes a zombie, and the bud is the same.
Control methods: 1. Agricultural control: (1) Poplar moths; (2) Corn sorghum traps; (3) Field tillage management and farming operations to reduce the density of insects.
2, biological control: (1) the application of microbial pesticides to control cotton bollworm. (2) Protect the use of natural enemies. There are many natural enemies of Helicoverpa armigera, such as the parasitic larvae of Trichogramma, the parasitic larvae, the parasitic larvae, the grasshoppers, the ladybugs, the small buds, the spiders and other predators and larvae. The harm of the insects has a good effect.
3, chemical control method: 25% hydrogen bromide 1000 times ~ 1500 times, phoxim, dichlorvos 1000 times control three generations of cotton bollworm can choose 40% Huifeng No. 1 emulsifiable oil 50 ml / acre, 25% fast killing spirit 60 ml / acre, 4.5% cypermethrin and 50% phoxim emulsifiable concentrate spray or rotate. 1 to 4 days after the hatching of cotton bollworms is suitable for prevention and control, and should be timely prevented.
Symptoms of sunflower and sunflower mites: mainly the disk and seeds of sunflower and wild chrysanthemum plants. Adults appeared in the middle and late July, and the emergence period was from the end of July to the beginning of August (the flowering period of sunflower). Adults crouched on the disk to feed on nectar and mated to lay eggs. The spawning period is in early August, and the egg period is 3 days to 5 days. The larvae have 4 instars, and the 1st and 2nd instar larvae eat the tubular flowers. After 3rd instar, the seeds are eaten along the gaps of the sunflower seeds, and the seeds are partially or completely eaten to form empty shells or deep stalks. , bite the disk into a lot of tunnels. When the larva is harmed, the silky nets adhere to the insect feces and debris on the flower plate, which is like a silk felt. The damaged disk is rotted and moldy after rain, which seriously reduces the yield and quality.
Control methods: 1, autumn and winter irrigation can be a large number of wintering cockroaches into the soil, reducing the amount of overwintering insects. 2. Chemical control. In the less damaging area, you can spray 90% trichlorfon 500 times to 1000 times liquid on the flower disk in the larval stage (around early August). Heavier areas should be dominated by adult control and combined with larvae. In the late stage of July and early August, the adult phobia agent is smoked or stalked with dichlorvos (80% dichlorvos immersed in sorghum stalks and inserted into the field), and then applied again every 3 to 5 days (according to the amount of insects). At the peak of larvae (upper and mid-August), spray 90% of trichlorfon 500 times to 1000 times.
Brown spot disease is a symptom: the lesions on the leaves of cotyledons and seedlings are nearly round, brown, with a yellow halo on the periphery, grayish white on the back of the lesions, polygons on the leaves of adult plants, brown, yellow halo. There are many small black spots on the lesions, which are conidia of the bacteria. The lesion can peel off the perforation when it is raining and wet. In severe cases, the lesions can meet and the entire leaf is dead.
Control methods: 1. Deeply turn the ground, eradicate the self-produced seedlings, etc., and remove the sick plants. 2, the initial stage of the disease, the bottom leaves, diseased leaves, while spraying 50% carbendazim WP 500 times solution or 70% methyl thiophanate WP 10,000 times solution, even spray twice, 10 days apart.
Soybean soybean sclerotium disease symptoms: the upper part of the damaged plant begins to develop from the lower part of the main stem of the plant. The lesion is water-stained, irregular, light brown or nearly white, and can surround the stem and go up and down. Spread, the disease department is often dead, it can also cause the stem to break. When wet, the diseased part is flocculent white hyphae, which produces black rat fecal sclerotia, the diseased stem pith becomes empty, and the sclerotia occupies its space. Longitudinal tearing of the stem cortex during post-drying. When the leaves are damaged, they are dark cyan water stains, rot, and sometimes flocculent hyphae.
Prevention and treatment methods: Comprehensive prevention and control should be adopted to eliminate the primary infection source.
1. The ward must avoid continuous cropping or crop rotation or sunflower or rape. It has obvious effects when it is rotated with grass crops for more than one year. 2. The diseased field should be turned deep after harvesting, and the sclerotia of the topsoil should be turned into the soil; the residual stems should be removed or burned in time to reduce the bacterial source. The soybeans are cultivated in time to prevent the sclerotia from sprouting or forming a sac. Pay attention to the silt and cure the land, and level the land to prevent the accumulation of water and water. 3. Eliminate the mixed sclerotia in the seeds. 4, after the sclerotia sprouts from the soil to the formation of the ascending sac, the spraying of 50% keering WP on the soil surface, about 30 grams to 60 grams per acre, adding 40 kg to 50 kg of water spray. Or use 50% carbendazim wettable powder 100 grams per acre or 50% sclerotin WP 50 grams, 50 kg of water also has a good effect, but the surface effect of spraying plants after the onset is poor.
Symptoms of soybean gray spot disease: mainly damage the leaves of adult plants, and can also infect seedlings, stems, pods and seeds. Semi-circular or round brown lesions appear on the cotyledons of seedlings born from diseased grains. The lesions on the leaves of the adult stage are initially green round spots, and gradually develop into frog eye spots with marginal brown, central gray or taupe, so it is also known as frog eye disease. Irregular lesions can also form in the later stages. In the wet area, the gray part of the central part of the lesion on the back of the leaf is a conidia of the pathogen. In severe cases, the lesions are covered with foliage, the lesions merge, and the leaves die. The stems are spindle-shaped or elliptical, and the pods are round or elliptical. Because the pods are hairy, it is difficult to see the mildew. The lesions on the grain are similar to the leaf spots, mostly round frog eyes.
Control method: chemical control. 1. In the area where the seedling stage is moist and rainy, mix with 50% Fumeishuang or 50% carbendazim, 0.3 kg per 100 kg of seeds; 2. For susceptible varieties, grow dense bean fields, in the early stage of the disease or Pods and kernels are susceptible to spraying during the disease to control lesions on the kernel. Commonly used agents are 40% carbendazim suspension or 50% carbendazim WP, 100 grams per acre, or 50% methyl thiophanate 100 grams, plus water 80 kg to 100 kg spray. According to the development of the disease, the interval is 7 days to 10 days, a total of 2 to 3 times.
Peanut root knot nematode disease symptoms: the underground parts of peanuts can be invaded. When the roots begin to grow, the larvae invade from the root end. Repeated invasion of the larva causes the entire root to form a braided "sessile root".
Control methods: 1, agricultural control. Deeply change the soil, increase the application of organic fertilizer, and enhance the disease resistance of peanuts.
2. Chemical control. 3% of Keweiwei granules were applied to 5 kg of granules and 10 kg of 3% methyl isosulfur granules to treat the soil. It is also possible to use seed coating agent No. 4, seed dressing with 2% seed amount, medium disease incidence of disease index of 50% to 60% and weighting of 70% to 80%, and alternate use of 6% iron gram of 1 kg per mu. , or 10% gram of phosphorus 2 kg, the above granules are evenly spread in the ditch, sowing the soil. In dry years, water should be ditched and then sown.
Symptoms of dwarf virus disease: the diseased plant is short, the long-term atrophy is not long, the internode is short, the height of the plant is often 1/3 to 2/3 of the healthy plant, the single leaf becomes smaller and thicker, the leaf color is darker, and the result is less. Small, like soybean granules, some of the husks are cracked, revealing purple-red small seed kernels, and the fibrous roots and nodules are obviously scarce.
Control methods: 1. Select seed kernels with full grain, strictly remove the diseased, small and discolored seeds to reduce the initial infection of the field. 2, 50% captan 300 times solution, or 15% powder rust 1500 times solution spray.
Symptoms of rust: mainly occur on the leaves, and can also infect the petioles, stems and stems. In the onset of the leaves, the needle-sized yellowish lesions first appeared, and then gradually expanded into reddish-brown protrusions, and the epidermis was longitudinally split, revealing a reddish-brown powdered summer spore heap. The spore heap is yellowish brown with a pale yellow color and is finally brown. There is a less obvious yellow halo around the lesion. The lesion on the leaf has more back than front. Most of the damaged plants began to develop from the bottom leaves, gradually spread upward, the leaves turned yellow, and finally dried up, and the whole plant died.
Control method: spray 75% chlorothalonil WP 500 times solution, or 50% thiram, thiram iron 400 times solution, 1500 times solution, or 30% pediatric emulsifiable oil 30 ml to 60 ml per mu. Re-spray after heavy rain.
Symptoms of peanut mites: Peanut mites are concentrated on the back of the heart and young leaves, tender stems and young shoots. After flowering, the flower buds and fruit needles absorb juice. The damaged plants grow short, and the leaves are curled up, which affects flowering and results. In severe cases, the stems and leaves turn black, and the mites discharge a lot of "nectar"
, causing mold parasites, heavy can cause plants to die.
Control method: chemical control. Spray: 40% to 1500 times solution of 40% dimethoate emulsion, or 50% malathion or 50% chlorpyrifos 1000 times solution, or 50% phosphorus amine 3000 times to 5000 times solution. Use 50% ridiculous fog, 8 grams to 10 grams per acre, 40 kg to 50 kg of water spray, good control effect, and can protect natural enemies; dusting: mastering the second time before the 锄, the early and evening leaves closed When done, spray 1.5% dimethoate powder, or 2.5% trichlorfon powder, or 1.5% methyl powder.
Corn corn borer is a symptom of damage: corn borer is harmed by larvae. The first-instar larvae feed on young leaves to form ribs and mosaics. After 3 years of age, the larvae invaded into the stalk, which was harmful to the flower buds, tassels and ears. The nutrient and water transport of the damaged corn was blocked, the growth was weak, the stems were easy to fold, and the ears were poorly developed, which affected the fruiting. The larva damages the cotton into the tender stem, causing the upper part to die, and the cotton bolls cause ringing, decay and deadlock.
Control method: Summer corn is controlled once at the end of the heart. When the ear rate of the ear is 10% or 100%, and the ear filament has 50 heads, it should be prevented immediately.
The granules can be prepared by mixing granules with 500% of 50% parathion emulsifiable concentrate and appropriate amount of water, and mixing with 25 kg of sieved (25 mesh to 60 mesh) cinder or sand granules. At the end of the corn leaf stage, 1 gram to 2 grams of granules per granule is applied. In addition, insecticidal bis- or hydrobromide, or monocrotophos may be used.
Symptoms of corn borer: Corn borer clusters in the heart of the corn seedlings, sucking and sucking. As the plant grows concentrated on the new leaves, it is harmful. The booting stage is more dense in the flag leaf and on the leaf sheath. While sucking corn sap, while excreting a lot of honeydew, covering the honeydew on the leaf surface affects photosynthesis, it is easy to cause mold parasitism, the damaged plant grows weak, dysplasia, and yield declines.
Control methods: 1. Agricultural control. (1) Eliminate the weeds in the field to reduce the source of insects; (2) Remove the tassels of the central buds and reduce the amount of insects. 2. Chemical control. Apply granules. Use 50 ml of 40% dimethoate, 0.5 kg of water, mix 15 kg of sand, and sprinkle 1 g per acre. Use 50% anti-Pu Wei WP, 6 g ~ 10 g per acre, spray 60 kg ~ 75 kg of water, or use 50% omethoate EC 50 ml, add water 50 kg ~ 75 kg. 75 kg of liquid per acre.
Maize small spot disease is a symptom of the disease: corn leaf spot can occur from the seedling stage to the mature stage, and the disease is severe after the male is sucked. Mainly harmful to the leaves, but also harmful leaf sheath and eucalyptus leaves. There are many lesions on the leaves. Initially water-immersed, later turned yellow brown or reddish brown, the edge color is darker, elliptical, round or oblong, the size is 5 ~ 10 × 3 ~ 4 mm, the lesions are often connected to each other into pieces, forming Larger dead spots. Rainy and humid weather, sometimes dark brown mold layer can be seen on the lesions. Most of the leaves from the lower part of the plant first develop, spread upward and expand.
Control methods: 1. Strengthen cultivation management. The soil is deeply ploughed with high temperature and fattening to kill the bacteria. Apply sufficient fertilizer to increase the phosphate fertilizer, re-apply the flare fertilizer, and timely irrigate irrigation. Strengthen corn field management and enhance corn disease resistance. 2. Chemical control. Before and after the heading of the corn, the medicine is sprayed before the disease expands. When spraying, first remove the bottom diseased leaves, use 50% carbendazim WP, 75% chlorothalonil WP, 50% carbendazim WP, 40% ozyl emulsifiable concentrate, etc., add 500 times of water Spraying; or 70% methyl thiophanate, 65% daikon zinc WP can be sprayed 500 times to 800 times, 50 kg to 70 kg per acre, 7 days to 10 days, a total of two or three times.
Control methods: 1, pesticide control. Soak the seeds with phorate, use 1kg of 75% phorry emulsifiable concentrate per 100 kg of dry cotton, pour 50 liters of warm water from 55 °C to 60 °C into the cement mixing tank, pour in the medicinal product, and then pour the cotton into the mixing. After the drug is sucked dry, the shovel can be shovel for 24 hours, and then it can be sown; phoxim, omethoate spray; use dioxin to kill scorpion.
Symptoms of red bollworm: 1, bud, flower damage. Break in from the top of the flower bud, leaving a large hole in the needle tip. The larvae eat the stamens in the buds, and some of the buds are eaten and shed. Some do not fall off and still flower, but the flowers are poorly developed and some of the petals stick and twist. 2, Qingling was killed. Intrusion from the base, the pupil is healed soon, and irregular protrusions are formed on the inner wall of the bell shell. Older green bells are damaged, and there are worms on the inner wall of the shell. The larvae invade and eat cottonseed. The murdered cotton boll was soaked by rain and the bell chamber became a deadlock. 3. Seeds are killed. The kernels are eaten and become empty shells with wormholes.
Control method: chemical control. The hydrolysin is 2.5% mu active ingredient 0.5g ~ 1g, the kungfu chrysanthemum is 1g per acre, and the carbaryl is diluted 1:250 times.
Helicoverpa armigera damage symptoms: 1, the second generation (buds and buds) is harmful. The larvae of the growing point damage the leaflet buds around the center of the heart into a nick, with fine worms, and the leaves are deformed after unfolding; the growth point is often destroyed, causing the top of the cotton stem to stop growing, growing from the top of the leaf stalks at the top. The long branches, which are basically not long flower buds, make the whole cotton become light stalk cotton with only long leaves and stalks, which is commonly known as "public cotton". The top tender leaves were eaten into many small perforations.
Lei was killed. The larvae are hidden in the eucalyptus leaves for feeding young buds, and there are worms at the pupils; the buds of the buds are opened and quickly fall off.
The flower was killed. The stamens and styles of the flowers are eaten; the base of the ovary is intruded, and the flowers are often not ringing.
2. The third and fourth generations (the bell period) are harmful. There is a pupil at the base of the cotton boll, and there is worm feces near the orifice. Most of the larvae that are foraging are exposed outside the bell; the mottled boll is easy to be sore and shed when it is raining, and the damaged part that does not fall off becomes a zombie, and the bud is the same.
Control methods: 1. Agricultural control: (1) Poplar moths; (2) Corn sorghum traps; (3) Field tillage management and farming operations to reduce the density of insects.
2, biological control: (1) the application of microbial pesticides to control cotton bollworm. (2) Protect the use of natural enemies. There are many natural enemies of Helicoverpa armigera, such as the parasitic larvae of Trichogramma, the parasitic larvae, the parasitic larvae, the grasshoppers, the ladybugs, the small buds, the spiders and other predators and larvae. The harm of the insects has a good effect.
3, chemical control method: 25% hydrogen bromide 1000 times ~ 1500 times, phoxim, dichlorvos 1000 times control three generations of cotton bollworm can choose 40% Huifeng No. 1 emulsifiable oil 50 ml / acre, 25% fast killing spirit 60 ml / acre, 4.5% cypermethrin and 50% phoxim emulsifiable concentrate spray or rotate. 1 to 4 days after the hatching of cotton bollworms is suitable for prevention and control, and should be timely prevented.
Symptoms of sunflower and sunflower mites: mainly the disk and seeds of sunflower and wild chrysanthemum plants. Adults appeared in the middle and late July, and the emergence period was from the end of July to the beginning of August (the flowering period of sunflower). Adults crouched on the disk to feed on nectar and mated to lay eggs. The spawning period is in early August, and the egg period is 3 days to 5 days. The larvae have 4 instars, and the 1st and 2nd instar larvae eat the tubular flowers. After 3rd instar, the seeds are eaten along the gaps of the sunflower seeds, and the seeds are partially or completely eaten to form empty shells or deep stalks. , bite the disk into a lot of tunnels. When the larva is harmed, the silky nets adhere to the insect feces and debris on the flower plate, which is like a silk felt. The damaged disk is rotted and moldy after rain, which seriously reduces the yield and quality.
Control methods: 1, autumn and winter irrigation can be a large number of wintering cockroaches into the soil, reducing the amount of overwintering insects. 2. Chemical control. In the less damaging area, you can spray 90% trichlorfon 500 times to 1000 times liquid on the flower disk in the larval stage (around early August). Heavier areas should be dominated by adult control and combined with larvae. In the late stage of July and early August, the adult phobia agent is smoked or stalked with dichlorvos (80% dichlorvos immersed in sorghum stalks and inserted into the field), and then applied again every 3 to 5 days (according to the amount of insects). At the peak of larvae (upper and mid-August), spray 90% of trichlorfon 500 times to 1000 times.
Brown spot disease is a symptom: the lesions on the leaves of cotyledons and seedlings are nearly round, brown, with a yellow halo on the periphery, grayish white on the back of the lesions, polygons on the leaves of adult plants, brown, yellow halo. There are many small black spots on the lesions, which are conidia of the bacteria. The lesion can peel off the perforation when it is raining and wet. In severe cases, the lesions can meet and the entire leaf is dead.
Control methods: 1. Deeply turn the ground, eradicate the self-produced seedlings, etc., and remove the sick plants. 2, the initial stage of the disease, the bottom leaves, diseased leaves, while spraying 50% carbendazim WP 500 times solution or 70% methyl thiophanate WP 10,000 times solution, even spray twice, 10 days apart.
Soybean soybean sclerotium disease symptoms: the upper part of the damaged plant begins to develop from the lower part of the main stem of the plant. The lesion is water-stained, irregular, light brown or nearly white, and can surround the stem and go up and down. Spread, the disease department is often dead, it can also cause the stem to break. When wet, the diseased part is flocculent white hyphae, which produces black rat fecal sclerotia, the diseased stem pith becomes empty, and the sclerotia occupies its space. Longitudinal tearing of the stem cortex during post-drying. When the leaves are damaged, they are dark cyan water stains, rot, and sometimes flocculent hyphae.
Prevention and treatment methods: Comprehensive prevention and control should be adopted to eliminate the primary infection source.
1. The ward must avoid continuous cropping or crop rotation or sunflower or rape. It has obvious effects when it is rotated with grass crops for more than one year. 2. The diseased field should be turned deep after harvesting, and the sclerotia of the topsoil should be turned into the soil; the residual stems should be removed or burned in time to reduce the bacterial source. The soybeans are cultivated in time to prevent the sclerotia from sprouting or forming a sac. Pay attention to the silt and cure the land, and level the land to prevent the accumulation of water and water. 3. Eliminate the mixed sclerotia in the seeds. 4, after the sclerotia sprouts from the soil to the formation of the ascending sac, the spraying of 50% keering WP on the soil surface, about 30 grams to 60 grams per acre, adding 40 kg to 50 kg of water spray. Or use 50% carbendazim wettable powder 100 grams per acre or 50% sclerotin WP 50 grams, 50 kg of water also has a good effect, but the surface effect of spraying plants after the onset is poor.
Symptoms of soybean gray spot disease: mainly damage the leaves of adult plants, and can also infect seedlings, stems, pods and seeds. Semi-circular or round brown lesions appear on the cotyledons of seedlings born from diseased grains. The lesions on the leaves of the adult stage are initially green round spots, and gradually develop into frog eye spots with marginal brown, central gray or taupe, so it is also known as frog eye disease. Irregular lesions can also form in the later stages. In the wet area, the gray part of the central part of the lesion on the back of the leaf is a conidia of the pathogen. In severe cases, the lesions are covered with foliage, the lesions merge, and the leaves die. The stems are spindle-shaped or elliptical, and the pods are round or elliptical. Because the pods are hairy, it is difficult to see the mildew. The lesions on the grain are similar to the leaf spots, mostly round frog eyes.
Control method: chemical control. 1. In the area where the seedling stage is moist and rainy, mix with 50% Fumeishuang or 50% carbendazim, 0.3 kg per 100 kg of seeds; 2. For susceptible varieties, grow dense bean fields, in the early stage of the disease or Pods and kernels are susceptible to spraying during the disease to control lesions on the kernel. Commonly used agents are 40% carbendazim suspension or 50% carbendazim WP, 100 grams per acre, or 50% methyl thiophanate 100 grams, plus water 80 kg to 100 kg spray. According to the development of the disease, the interval is 7 days to 10 days, a total of 2 to 3 times.
Peanut root knot nematode disease symptoms: the underground parts of peanuts can be invaded. When the roots begin to grow, the larvae invade from the root end. Repeated invasion of the larva causes the entire root to form a braided "sessile root".
Control methods: 1, agricultural control. Deeply change the soil, increase the application of organic fertilizer, and enhance the disease resistance of peanuts.
2. Chemical control. 3% of Keweiwei granules were applied to 5 kg of granules and 10 kg of 3% methyl isosulfur granules to treat the soil. It is also possible to use seed coating agent No. 4, seed dressing with 2% seed amount, medium disease incidence of disease index of 50% to 60% and weighting of 70% to 80%, and alternate use of 6% iron gram of 1 kg per mu. , or 10% gram of phosphorus 2 kg, the above granules are evenly spread in the ditch, sowing the soil. In dry years, water should be ditched and then sown.
Symptoms of dwarf virus disease: the diseased plant is short, the long-term atrophy is not long, the internode is short, the height of the plant is often 1/3 to 2/3 of the healthy plant, the single leaf becomes smaller and thicker, the leaf color is darker, and the result is less. Small, like soybean granules, some of the husks are cracked, revealing purple-red small seed kernels, and the fibrous roots and nodules are obviously scarce.
Control methods: 1. Select seed kernels with full grain, strictly remove the diseased, small and discolored seeds to reduce the initial infection of the field. 2, 50% captan 300 times solution, or 15% powder rust 1500 times solution spray.
Symptoms of rust: mainly occur on the leaves, and can also infect the petioles, stems and stems. In the onset of the leaves, the needle-sized yellowish lesions first appeared, and then gradually expanded into reddish-brown protrusions, and the epidermis was longitudinally split, revealing a reddish-brown powdered summer spore heap. The spore heap is yellowish brown with a pale yellow color and is finally brown. There is a less obvious yellow halo around the lesion. The lesion on the leaf has more back than front. Most of the damaged plants began to develop from the bottom leaves, gradually spread upward, the leaves turned yellow, and finally dried up, and the whole plant died.
Control method: spray 75% chlorothalonil WP 500 times solution, or 50% thiram, thiram iron 400 times solution, 1500 times solution, or 30% pediatric emulsifiable oil 30 ml to 60 ml per mu. Re-spray after heavy rain.
Symptoms of peanut mites: Peanut mites are concentrated on the back of the heart and young leaves, tender stems and young shoots. After flowering, the flower buds and fruit needles absorb juice. The damaged plants grow short, and the leaves are curled up, which affects flowering and results. In severe cases, the stems and leaves turn black, and the mites discharge a lot of "nectar"
, causing mold parasites, heavy can cause plants to die.
Control method: chemical control. Spray: 40% to 1500 times solution of 40% dimethoate emulsion, or 50% malathion or 50% chlorpyrifos 1000 times solution, or 50% phosphorus amine 3000 times to 5000 times solution. Use 50% ridiculous fog, 8 grams to 10 grams per acre, 40 kg to 50 kg of water spray, good control effect, and can protect natural enemies; dusting: mastering the second time before the 锄, the early and evening leaves closed When done, spray 1.5% dimethoate powder, or 2.5% trichlorfon powder, or 1.5% methyl powder.
Corn corn borer is a symptom of damage: corn borer is harmed by larvae. The first-instar larvae feed on young leaves to form ribs and mosaics. After 3 years of age, the larvae invaded into the stalk, which was harmful to the flower buds, tassels and ears. The nutrient and water transport of the damaged corn was blocked, the growth was weak, the stems were easy to fold, and the ears were poorly developed, which affected the fruiting. The larva damages the cotton into the tender stem, causing the upper part to die, and the cotton bolls cause ringing, decay and deadlock.
Control method: Summer corn is controlled once at the end of the heart. When the ear rate of the ear is 10% or 100%, and the ear filament has 50 heads, it should be prevented immediately.
The granules can be prepared by mixing granules with 500% of 50% parathion emulsifiable concentrate and appropriate amount of water, and mixing with 25 kg of sieved (25 mesh to 60 mesh) cinder or sand granules. At the end of the corn leaf stage, 1 gram to 2 grams of granules per granule is applied. In addition, insecticidal bis- or hydrobromide, or monocrotophos may be used.
Symptoms of corn borer: Corn borer clusters in the heart of the corn seedlings, sucking and sucking. As the plant grows concentrated on the new leaves, it is harmful. The booting stage is more dense in the flag leaf and on the leaf sheath. While sucking corn sap, while excreting a lot of honeydew, covering the honeydew on the leaf surface affects photosynthesis, it is easy to cause mold parasitism, the damaged plant grows weak, dysplasia, and yield declines.
Control methods: 1. Agricultural control. (1) Eliminate the weeds in the field to reduce the source of insects; (2) Remove the tassels of the central buds and reduce the amount of insects. 2. Chemical control. Apply granules. Use 50 ml of 40% dimethoate, 0.5 kg of water, mix 15 kg of sand, and sprinkle 1 g per acre. Use 50% anti-Pu Wei WP, 6 g ~ 10 g per acre, spray 60 kg ~ 75 kg of water, or use 50% omethoate EC 50 ml, add water 50 kg ~ 75 kg. 75 kg of liquid per acre.
Maize small spot disease is a symptom of the disease: corn leaf spot can occur from the seedling stage to the mature stage, and the disease is severe after the male is sucked. Mainly harmful to the leaves, but also harmful leaf sheath and eucalyptus leaves. There are many lesions on the leaves. Initially water-immersed, later turned yellow brown or reddish brown, the edge color is darker, elliptical, round or oblong, the size is 5 ~ 10 × 3 ~ 4 mm, the lesions are often connected to each other into pieces, forming Larger dead spots. Rainy and humid weather, sometimes dark brown mold layer can be seen on the lesions. Most of the leaves from the lower part of the plant first develop, spread upward and expand.
Control methods: 1. Strengthen cultivation management. The soil is deeply ploughed with high temperature and fattening to kill the bacteria. Apply sufficient fertilizer to increase the phosphate fertilizer, re-apply the flare fertilizer, and timely irrigate irrigation. Strengthen corn field management and enhance corn disease resistance. 2. Chemical control. Before and after the heading of the corn, the medicine is sprayed before the disease expands. When spraying, first remove the bottom diseased leaves, use 50% carbendazim WP, 75% chlorothalonil WP, 50% carbendazim WP, 40% ozyl emulsifiable concentrate, etc., add 500 times of water Spraying; or 70% methyl thiophanate, 65% daikon zinc WP can be sprayed 500 times to 800 times, 50 kg to 70 kg per acre, 7 days to 10 days, a total of two or three times.
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】
FLU A&B Antigen Detection Kit (Colloidal Gold Method) is an in vitro rapid qualitative test Detection of influenza A and B nucleoprotein antigens directly from the nose swabs and nasopharyngeal swab samples collected from patients with symptoms and signs of respiratory infection. It is designed to aid in the rapid identification of influenza A and B virus infections.
home flu test kit,flu test kits,flu testing kit,rapid flu test kit,flu home test kit
Yong Yue Medical Technology(Kunshan) Co.,Ltd , https://www.yonyue.com