Prevention and treatment of peanut leaf spot
Peanut brown spot occurs early, and occurs early in the flowering period; black spot occurs later, and occurs only in the next pinning period. The main reasons for the occurrence of leaf spot disease in peanuts are closely related to the short rotation period, high temperature and high humidity environment, weak disease resistance, poor sandy soil strength, and insufficient fertilization.
First, the prevention and treatment of peanut leaf spot disease:
1. Rotation. Peanut implements a dry and dry rotation, and it works better with rice. Peanuts on dry slopes and dry land crops such as corn, sweet potatoes, and cassava rotate. In a round of 2 years, it can reduce the damage of peanut leaf spot.
2. Improve the soil. Improve the cultivation conditions, increase organic manure fertilizer, improve the soil, and enhance the disease resistance of peanuts.
3. Chemical control. Peanut leaf spot includes peanut brown spot and black spot. During the fruit enlargement period, when the diseased leaf rate reaches 10% in the field, it should be sprayed and controlled in time. The commonly used agents are 50% carbendazim 600 times, 99% daytime hymexazol 3000 times, 70% thiophanate-methyl 600 times 6000 times times silicone silicone spray, saving labor-saving, prevention and control effect is remarkable.
Second, the identification of peanut bacterial wilt and prevention of symptoms:
Peanuts are most susceptible to the disease at the early flowering stage. At the beginning of the diseased plant, the first and second leaves of the main stem tip were wilted and wilted. The leaves were delayed in the morning and the leaves were folded ahead of time in the afternoon. After 1 or 2 days, the whole plant or one leaf of the diseased plant withered from top to bottom and faded in color, appearing green and green, and the late diseased leaves became brown and dry. Diseased plants are easy to pull up, their main root tips, stalks, and fruit pods are dark brown and rot. The nodules are dark green. The vascular bundles of the diseased stems were dark brown in color, and the white mucus overflowed under the moisturizing of the cross section.
Control methods
1. Agricultural control: Select high-yield, disease-resistant varieties and make a reasonable rotation. Where there are water sources, the rotation of crops should be carried out with good control effect; the dry land can be used for 3 to 5 years of rotation with melons and grass crops to avoid continuous cropping with solanaceae, leguminous, sesame and other crops. Peanuts in the drylands, for short-term irrigation before sowing, can cause a large number of deaths of the bacteria.
The use of formula fertilization techniques, Shizu base fertilizer, application of phosphorus, potassium fertilizer, appropriate nitrogen fertilizer, spraying Tianda 2116, promote steady long hair and peanuts. Lime can be applied to acidic soils to reduce soil acidity and reduce disease occurrence.
2. Seed dressing: Before sowing, use Tianda 2116 dipping and dressing special-purpose 50g watered 750g, mix peanuts 20kg, do not boring species.
3. Spraying: After the peanuts emerge out of the seedlings, the mu is sprayed with 72% of agricultural streptomycin 4000 times and 10% of the world's high 2500 times. To increase the efficacy, it can be blended with Tianda 2116 Zhuangmiaoling 600 times liquid. Tianda silicone 6000 spray, better effect.
First, the prevention and treatment of peanut leaf spot disease:
1. Rotation. Peanut implements a dry and dry rotation, and it works better with rice. Peanuts on dry slopes and dry land crops such as corn, sweet potatoes, and cassava rotate. In a round of 2 years, it can reduce the damage of peanut leaf spot.
2. Improve the soil. Improve the cultivation conditions, increase organic manure fertilizer, improve the soil, and enhance the disease resistance of peanuts.
3. Chemical control. Peanut leaf spot includes peanut brown spot and black spot. During the fruit enlargement period, when the diseased leaf rate reaches 10% in the field, it should be sprayed and controlled in time. The commonly used agents are 50% carbendazim 600 times, 99% daytime hymexazol 3000 times, 70% thiophanate-methyl 600 times 6000 times times silicone silicone spray, saving labor-saving, prevention and control effect is remarkable.
Second, the identification of peanut bacterial wilt and prevention of symptoms:
Peanuts are most susceptible to the disease at the early flowering stage. At the beginning of the diseased plant, the first and second leaves of the main stem tip were wilted and wilted. The leaves were delayed in the morning and the leaves were folded ahead of time in the afternoon. After 1 or 2 days, the whole plant or one leaf of the diseased plant withered from top to bottom and faded in color, appearing green and green, and the late diseased leaves became brown and dry. Diseased plants are easy to pull up, their main root tips, stalks, and fruit pods are dark brown and rot. The nodules are dark green. The vascular bundles of the diseased stems were dark brown in color, and the white mucus overflowed under the moisturizing of the cross section.
Control methods
1. Agricultural control: Select high-yield, disease-resistant varieties and make a reasonable rotation. Where there are water sources, the rotation of crops should be carried out with good control effect; the dry land can be used for 3 to 5 years of rotation with melons and grass crops to avoid continuous cropping with solanaceae, leguminous, sesame and other crops. Peanuts in the drylands, for short-term irrigation before sowing, can cause a large number of deaths of the bacteria.
The use of formula fertilization techniques, Shizu base fertilizer, application of phosphorus, potassium fertilizer, appropriate nitrogen fertilizer, spraying Tianda 2116, promote steady long hair and peanuts. Lime can be applied to acidic soils to reduce soil acidity and reduce disease occurrence.
2. Seed dressing: Before sowing, use Tianda 2116 dipping and dressing special-purpose 50g watered 750g, mix peanuts 20kg, do not boring species.
3. Spraying: After the peanuts emerge out of the seedlings, the mu is sprayed with 72% of agricultural streptomycin 4000 times and 10% of the world's high 2500 times. To increase the efficacy, it can be blended with Tianda 2116 Zhuangmiaoling 600 times liquid. Tianda silicone 6000 spray, better effect.
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