Can gnaw at the branches and leaves of Datura
Control with 2000 fold solution of 40% dimethoate emulsion.
It is easy to damage leaves in summer.
It is controlled by 90% times of 800 fold of the pesticide, and is avoided by rotation with Solanaceae crops.
One of the most common diseases of Datura is leaf damage.
Like other diseases, they will live through the winter on the diseased body, and when the temperature is appropriate in the second year, conidia will continue to infect by means of wind and rain transmission. July and August are the peak period of the disease, and the most serious period is high temperature and rainy.
At the early stage, the leaves turn light brown, round, and at the later stage, they turn gray brown or brown. When the environment humidity is high, black mold can be produced.
Planting should be reasonably dense, ventilation and ventilation should be paid attention to, and drainage should be conducted in time after rain.
Clearing the garden after harvest and burning the diseased leaves;
Before and at the beginning of the disease, spray 50% of 1000 fold solution of abamectin or 65% of 500 fold solution of wettable zineb
The infected plants' leaf veins turn yellow, then turn brown gradually, wither from the edge of the leaf, the veins remain green, the leaves turn yellow gradually from the bottom to the top, the diseased stem is dissected horizontally, and the vascular bundle is dark brown. Some are only 1 ~ 2 branches. Serious illness can not result.
① rotate. ② if necessary, water 50% thiophanate methyl or carbendazim wettable powder 600-700 times.
