In recent years, mulberry has become the main pest of summer and autumn mulberry fields, August-September is the peak period of damage, there are the following technical difficulties in the prevention and control of production, need to take targeted measures.
Difficulties in control (1) The mulberry in the normal year has 5 to 6 generations a year, and there will be overlapping generations after the end of July. The harm will continue uninterrupted from August to September, and it will cause harm to the whole plant, eventually causing damage to the entire mulberry field. (2) Mulberry larvae begin to harm the silkworm rolling after 3rd instar, and it is difficult for the liquid to come into contact with the body. (3) In July-September, the mulberry height is generally more than 2 meters, and it is difficult to apply pesticides with a backpack sprayer. (4) There are few safe drugs for the sericulture season.
Technical Measures (1) Grasp the appropriate period. After the mulberry hatched, it was administered within 4 to 5 days before the third instar larvae. At this time, the larvae were concentrated on the buds on the top of the mulberry tree. There was no leaf hiding, and the small drug resistance was weak. It was the best time for medicine. . The survey was conducted every 2 days in late July. The top buds of mulberry trees were observed before 8 o'clock in the morning. If the top buds had filaments around them, the buds were not in the correct shape. In general, there were insects in the buds and they were found in the entire mulberry field. When the top buds of insects reached 10% or more, they began to use drugs. Due to the severe overlap of mulberry generations, spraying once every 8 to 10 days after the first spraying to control hazards. (2) Use a suitable sprayer. In the appropriate period of control, the use of backpack sprayer top spray can achieve control purposes. If combined with the control of other pests, it is best to use a mister or other highly sprayed medicine to achieve the desired control effect. (3) Rational selection of drugs. In the mulberry garden that does not support mid-autumn autumn silkworms, dichlorvos, phoxim, and prochlorphyctin may be used; in mid-autumn autumn silkworms, dichlorvos and phoxim may be used for patching, and the leaves must be tested before feeding to ensure the safety of silkworms. (4) Remove the leaf. For the mulberry larvae's habit of rolling leaves after 3rd instar, timely removal of leaf leaves can effectively reduce the population of larvae.
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