Prevention and control of diseases and insect pests of Chenxiang

Seedling wilt the disease occurs in the seedling bed and causes the seedlings to wilt and die. Old nursery bed, poor drainage, dense planting and easy to develop.

Prevention and treatment methods: disinfect the seedling bed before ① planting, reasonable close planting; pull out the diseased plants in time at the initial stage of ② and drench the soil with 70% dimethazone 1000-1500 times and 50% carbendazim 800 times 2 times 3 times, with an interval of 7-10 days each time.

Anthracnose damage leaves, the initial brown dots, and then expand into a round, oval to irregular spots, some of the disease spots are wheel-shaped, serious leaves fall off. It is easy to occur when the rain is wet and the dew is heavy.

Prevention and treatment: at the initial stage of the disease, 80% anthrax 600 times 700 times or 75% chlorothalonil 400 times 600 times 2 times 3 times, each time at an interval of 7 days.

Leaf curlers do harm between summer and autumn every year. The larvae roll up the leaves and eat the mesophyll, which weakens the photosynthesis and affects the normal growth.

Control method: ① artificial killing: timely cutting off rolled leaves, concentrated and deep burying to reduce insect pests. ② insecticide control: 25% chlordimeform can be diluted 500 times before leaf rolling or egg incubation, or sprayed with 80% dichlorvos EC 800~l000, once every 5 to 7 days for 2 consecutive 3 times. Longicorn beetle larvae eat xylem from the stem, branch or stem base, and die when the tree trunk is seriously damaged.

Prevention and control methods:

① artificially kills eggs and larvae; when ② finds wormholes, use a syringe to inject 80% dichlorvos 800 to 1000 times, and then seal with yellow mud. Beetles often harm young buds, tender shoots and flowers during shoots and flowering. Prevention and control method: kill or spray 80% dichlorvos 1000 times liquid to control.