As its name suggests, the larvae have brown stripes, prefer to lie diurnal and nocturnal, have strong phototropism, hide underground during the day, and come out at night to eat. It is mainly larval infestation that likes to gather together to nibble on young citrus leaves. The development temperature of the twill moth is 29 ~ 30 ° C, and it will appear in large quantities during the general high temperature season, which is seriously harmful. Adults begin to lay eggs in late April, with the most severe in June-September.
Twill moths are highly resistant and are difficult to eliminate with chlorpyrifos or avermectin alone. Moreover, the older the insect age, the stronger the drug resistance, and the best period for the elimination of twill moths before the 3rd instar; control methods:
1. The agent can choose methylene salt, 30% insect mite nitrile, 12% beetle mite nitrile, Thuringiensis and so on.
2. You can hang black light or frequency vibration insecticidal lamp to trap adult insects. If you see that there are egg blocks in the leaves, you should remove them in time.
Notes:
1. Adult insects have phototropism, it is recommended to spray in the evening to control larvae, spray 2 times, according to the weather conditions interval of 6 to 10 days
2, because the larvae will hide on the ground, spray the tree body at the same time to spray the ground also wet, but also pay attention to the ground medicine