The yellow caterpillar is a leaf-feeding pest, and its damage to louse is extremely serious. With the continuous expansion of the cultivated area in recent years, its damage has also increased. I. Harmful conditions: The yellow caterpillars are mainly eaten by larvae. The first-instar larvae have a clustered nature, and the second-instar larvae begin to disperse, and the food intake increases greatly after the third instar. It has been observed that larvae mainly cause damage to the leaves of new shoots. Every time a new shoot is picked, there will be a period of rise of the population. With the maturity of the leaf, the amount of insects in the field will also decrease. The damage of yellow caterpillars on perennial old trees is mainly due to the tender leaves at the top of litchi strips. Sometimes mature larvae may injure the larger leaves. When a large number of yellow caterpillars occurred, the new leaves of the victims were all eaten. The old leaves only had leaf veins, which caused the tree vigor to weaken, and the yield dropped sharply. Second, the law of occurrence: Occurrence of yellow caterpillar four generations a year, the first generation is from early May to mid-June; the second generation is from late June to early August; the third generation is from mid-August to mid-September; the fourth generation is From late September to late October. It enters the wintering period after October. Cockroaches are evergreen fruit trees. They shoot many new shoots a year. Each new shoot is a culmination of a yellow caterpillar. Every year, there are spring shoots, summer shoots, autumn shoots, early summer shoots before summer shoots, and early autumn shoots before autumn shoots. Therefore, the peak period of the damage of yellow caterpillars coincides with the shoot period of new shoots. Third, prevention and control technology: 1. Pesticide control: There are two points to be noted in the chemical control. First, the selection of pollution-free pesticides ensures the quality and health of the fruit. The second is that adult fruit trees are different from young seedlings. The first generation of larvae of the yellow caterpillar is positively mature fruit of adult eucalyptus, so it is not appropriate to control it. The focus of young seedlings is to control the first generation of larvae of the yellow caterpillars, with 5% rotenone EC 1000 times or 2.5% Uranus EC 3000 times. 2. Biological control: The natural enemies of the yellow caterpillar are mainly thigh bees, lumba bees, gold wasps, and cynomolgus bees. Trichius bees, L. militaris mainly parasitize the yellow caterpillars; gold wasp parasitic second-instar larvae. In production, attention should be paid to the protection and use of natural enemies, maintaining the balance of ecosystems and controlling the occurrence of Trichoplusia. 3. Manually removing larvae: The first-instar larvae of C. sinensis have clusters of harmful habits. This habit should be used in production. Manual removal of first-instar larvae and reduction of insect sources can have a multiplier effect. Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone
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