First, the hazard characteristics of cotton bollworm larvae eat food buds, flowers, fruit-based, but also harm the tender stems, leaves and buds. When the buds are victimized, the leaves open and turn yellow-green and fall off after 2 to 3 days. Young fruit is often eaten empty or causes rot and falls off. Although the result was only eaten part of the flesh, it was due to boring in the pedicle to facilitate the decay of rain and bacteria.
Second, control methods
1. Prevent and control agricultural plowing before winter and flood the land to reduce overwhelming insect sources. According to the insect report, in the spawning period of cotton bollworms, pruning and destroying eggs were burnt.
2, biological control of adult spawning peak 3 to 4 days after spraying Bt emulsion, HD-1 l Bacillus thuringiensis or nuclear polyhedrosis virus, so that the larvae died of disease, continuous spray 2 times, the best control effect.
3, chemical control can be used 2.5% Kung Fu EC 5000 times, or 4.5% Beta-cypermethrin 3000 ~ 3500 times, 10% Bromofluthrin EC 1000 times, or 20% of cypermethrin (Brithrin Fungidronate) 3000 times cream, or 2.5% deltamethrin 2000 times, or 20% fenvalerate 2000 times spray.
Shanghai J.Shine Co.,Ltd , https://www.jshinechem.com