Occurrence and control of burdock disease

1. Aphid adult nymph occurs in seedling stage and bud stage, absorbs juice, stems, leaves, flowers and fruits can be damaged, affecting the normal growth and development of plants.

Control method: When it occurs, spray 40% dimethoate 800 times solution, 8% dichlorvos emulsion 2 000 times solution or lime tobacco water.

2. The larvae of Noctua viridis eat leaves, causing notches and holes, affecting the normal growth and development of plants.

Control methods: 50% phosphorus amine emulsifiable concentrate 1 500 times or 90% trichlorfon 800 times spray, spray once every 7-10 days, several times in succession.

3, leaf spot disease in July, August, high humidity and rainy season more often occur, in the lower leaves appear irregular yellow-green spots, then become pale brown, can make all leaves dry off.

Control method: Discovered diseased leaves, immediately removed and burned, spraying 1:1:150 Bordeaux mixture at the initial stage, once every 5-7 days, for 2-3 consecutive times.

4. Powdery mildew is easy to occur when it is wet and ventilated. After the disease, there is a layer of gray-white powder on both sides of the leaves, and black spots are born, and finally all dry and fall off.

Control method: pay attention to field ventilation and light transmission, remove diseased leaves and burn them, spray Baume 0.3-0.5 degree stone sulfur mixture, once every 7-10 days, for 3-4 times continuously.