Since July, the weather in most parts of Guangxi has continued to be hot, and the growth of mulberry trees and leaves has accelerated. At the same time, the generation cycle of mulberry garden pests is shortened and the generations are increased, and if it is not prevented and controlled in time, it will cause greater harm to the mulberry garden, which is not conducive to the development of sericulture in the second half of the year. Therefore, it is necessary to pay attention to observing the occurrence of diseases and insect pests in mulberry garden, and carry out timely prevention and control work according to the autumn silkworm leaf plan and the insect situation of mulberry garden to ensure that autumn silkworms use leaves.
First, the occurrence of mulberry tree diseases and insect pests
According to the analysis of insect information reporting data of the Mulberry Tree Disease and Pest Observation Station of Guangxi Sericulture Technology Promotion Station, the current mulberry garden diseases and insect pests are mainly mulberry borer hazards, mainly elderly larvae and pupae, and the next generation of mulberry borer hatching peak is expected to be in mid-August. At the same time, there are a small number of mulberry thrips that are endangered. In order to ensure the quality of leaves for autumn silkworm breeding, mulberry borers should be prevented and controlled in a timely manner, and attention should be paid to observing the dynamics of mulberry thrips in mulberry gardens and timely prevention and control.
Second, prevention and control methods
1. Prevention and control of mulberry borer
Mulberry borer control to grasp the time of medication, should be sprayed before the 3-instar larvae (that is, before the damage of leaf curls), focusing on spraying the top of the new shoots where the larvae are concentrated, conventional pesticides have 80% of dichlorvos 800 to 1000 times, and the safety interval of silkworms is 5 to 7 days.
2. Prevention and control of mulberry thrips
Hanging yellow and blue plates in mulberry gardens to trap mulberry thrips can play a role in monitoring and reducing the harm of mulberry thrips. The agent is sprayed with 80% dichlorvos 800 times liquid, 50% mulberry insect net 1000 times or 50% octinophos 1000 times liquid, and the safety interval of silkworms is 5 to 7 days. When spraying, align the back of the leaf with the degree of dripping of the liquid.
3. Precautions
1. Due to the recent high temperature, we should pay attention to safety protection when spraying, and it is recommended to spray in the morning and evening when the temperature is low to prevent personnel from being poisoned.
2, to achieve fine fog spraying, comprehensive and uniform, to improve the prevention and control effect.
3. It is best to use special pesticides in mulberry garden, grasp the residual period of pesticides, and ensure the safety of leaves.
【Source: Guangxi Sericulture Technology Promotion Station】
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