The pests and diseases of mulberry seedlings mainly include gray mold and anthracnose, and the pests mainly include small tigers, cockroaches and mulberry caterpillars.
First, gray mold: gray mold is a fungal disease caused by semi-known bacteria, similar to the muddy disease in forestry. The virus is severely affected in the case of low temperature and humidity, high air humidity, and heavy and humid soil. The affected mulberry tree has lesions at the base, which is initially oil-impregnated, and then turns brown. When wet, the lesions are rot-like. When dry, they are easily broken from the lesions. The mulberry seedlings are prone to gray-white villi-like mold layers. Gray mold.
Control methods: 1. Choose land. Do not use low-lying, wet belts with heavy viscous and inconvenient drainage. 2. Strengthen the management of seedlings. Pay attention to ditch drainage to low-lying, poorly drained mulberry fields to reduce the occurrence of pests and diseases. 3. Chemical control. In the early stage of the disease, 50% of the thiophanate 500 times solution or 70% of the thiophanate-methyl WP 1200-1000 times or 800-1000 times of the root rot- ing effect is 80-100%, which has no adverse effect on the silkworm.
2. Anthracnose disease: Mulberry anthracnose is a fungal disease caused by the pathogen of anthracnose. It spreads quickly. The warrior causes a large number of seedlings to die. The seedlings are prone to high temperature and humidity, and the disease occurs. The roots of the roots produce short-line lesions. The spot is bright red or auburn, and the leaf edge and tip of the leaf produce a small amount of lesions. The serious damage period is when the seedlings grow two true leaves.
Control methods: 1. Before and after the two true leaves, use 25% carbendazim powder 500 times or 70% methyl thiophanate WP 1000 times, spray once every two days. 2, strengthen the management of seedlings, low-lying and wet mulberry, pay attention to ditch drainage, reduce humidity. 3, seedling rotation. 4. Remove the pathogens and find that the diseased plants are collected and burned to prevent infection.
Third, è¼è›„: è¼è›„ is a generation in a year, the wintering adults begin to move in March-April, biting the seeds that have just been sowed and germinated in the soil, or biting the young stems and roots into a chaotic pattern, causing the seedlings to gradually wither Withered and dead, causing lack of seedlings; the activity of excavating tunnels often separates the young roots of the mulberry trees from the soil, causing death from water loss.
Control methods: 1. Deeply plowing and mulching before planting, and eliminating a large number of earthworms. It is not advisable to use unfertilized manure and fresh horse manure when applying bottom fertilizer to avoid trapping the cockroaches. 2, artificial killing. When the seedlings are arched to the fresh tunnel, the topsoil is shoveled, and the round hole is found. After the tunnel is dug, you can catch the shovel or dig some small pits around the seedlings after planting. Put a small amount of fresh horses and cow dung in the pit. Hay, open the hay the next morning to catch the cockroach. 3. Chemical control. Use 90% trichlorfon 250g, use hot water to make 30 times liquid, add 20 kg of fried bran, mix well, add water to make tofu-like bait, apply soil poisoning to kill pests.
4. Small tigers: Small tigers are also called silkworms and silkworms. Four generations a year. The leaves were taken before the 3rd instar, and the young stems of the mulberry seedlings were bitten after the 3rd instar. The most serious damage was when the mulberry seedlings grew to 8 true leaf.
Control methods 1. Select the land, eliminate the weeds, and intensively cultivate. 2, chemical control, before the seedlings with 25% of trichlorfon powder 2.5 kg per mu, or 90% crystal trichlorfon 800 times or 50% phoxim 1000 times liquid spray. 3, poison bait trap. 50 kg of fresh grass or kale can be chopped and added with 90% trichlorfon 0.5 kg to mix with water, 25 kg per acre. 4, manual capture. Generally, the seedlings are checked in the morning, and the new broken head is found to be damaged.
First, gray mold: gray mold is a fungal disease caused by semi-known bacteria, similar to the muddy disease in forestry. The virus is severely affected in the case of low temperature and humidity, high air humidity, and heavy and humid soil. The affected mulberry tree has lesions at the base, which is initially oil-impregnated, and then turns brown. When wet, the lesions are rot-like. When dry, they are easily broken from the lesions. The mulberry seedlings are prone to gray-white villi-like mold layers. Gray mold.
Control methods: 1. Choose land. Do not use low-lying, wet belts with heavy viscous and inconvenient drainage. 2. Strengthen the management of seedlings. Pay attention to ditch drainage to low-lying, poorly drained mulberry fields to reduce the occurrence of pests and diseases. 3. Chemical control. In the early stage of the disease, 50% of the thiophanate 500 times solution or 70% of the thiophanate-methyl WP 1200-1000 times or 800-1000 times of the root rot- ing effect is 80-100%, which has no adverse effect on the silkworm.
2. Anthracnose disease: Mulberry anthracnose is a fungal disease caused by the pathogen of anthracnose. It spreads quickly. The warrior causes a large number of seedlings to die. The seedlings are prone to high temperature and humidity, and the disease occurs. The roots of the roots produce short-line lesions. The spot is bright red or auburn, and the leaf edge and tip of the leaf produce a small amount of lesions. The serious damage period is when the seedlings grow two true leaves.
Control methods: 1. Before and after the two true leaves, use 25% carbendazim powder 500 times or 70% methyl thiophanate WP 1000 times, spray once every two days. 2, strengthen the management of seedlings, low-lying and wet mulberry, pay attention to ditch drainage, reduce humidity. 3, seedling rotation. 4. Remove the pathogens and find that the diseased plants are collected and burned to prevent infection.
Third, è¼è›„: è¼è›„ is a generation in a year, the wintering adults begin to move in March-April, biting the seeds that have just been sowed and germinated in the soil, or biting the young stems and roots into a chaotic pattern, causing the seedlings to gradually wither Withered and dead, causing lack of seedlings; the activity of excavating tunnels often separates the young roots of the mulberry trees from the soil, causing death from water loss.
Control methods: 1. Deeply plowing and mulching before planting, and eliminating a large number of earthworms. It is not advisable to use unfertilized manure and fresh horse manure when applying bottom fertilizer to avoid trapping the cockroaches. 2, artificial killing. When the seedlings are arched to the fresh tunnel, the topsoil is shoveled, and the round hole is found. After the tunnel is dug, you can catch the shovel or dig some small pits around the seedlings after planting. Put a small amount of fresh horses and cow dung in the pit. Hay, open the hay the next morning to catch the cockroach. 3. Chemical control. Use 90% trichlorfon 250g, use hot water to make 30 times liquid, add 20 kg of fried bran, mix well, add water to make tofu-like bait, apply soil poisoning to kill pests.
4. Small tigers: Small tigers are also called silkworms and silkworms. Four generations a year. The leaves were taken before the 3rd instar, and the young stems of the mulberry seedlings were bitten after the 3rd instar. The most serious damage was when the mulberry seedlings grew to 8 true leaf.
Control methods 1. Select the land, eliminate the weeds, and intensively cultivate. 2, chemical control, before the seedlings with 25% of trichlorfon powder 2.5 kg per mu, or 90% crystal trichlorfon 800 times or 50% phoxim 1000 times liquid spray. 3, poison bait trap. 50 kg of fresh grass or kale can be chopped and added with 90% trichlorfon 0.5 kg to mix with water, 25 kg per acre. 4, manual capture. Generally, the seedlings are checked in the morning, and the new broken head is found to be damaged.
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