Pest control of Pseudostellaria heterophylla in Zherong

It occurs in April-May, endangering the leaves, and the light invades the lower leaves, and then gradually spreads upward, resulting in dead spots on the leaves, and in severe cases, the plants die.

Prevention and control methods:

(1) After harvesting, clean up the dead branches and leaves thoroughly and burn them centrally;

(2) Strict crop rotation is not suitable for continuous cropping;

③ Spray 1: 1: 100 bordeaux mixture at the initial stage of onset, and spray 1 time every 10 day for 2-3 consecutive times;

④ In severe cases, spray 50% carbendazim 500- 1000 times or 70% thiophanate 800 times for 7- 10 days, 2-3 times in total.

(2) Root rot

At the early stage of the disease, the fibrous roots first turn brown and rot, and then gradually spread to the main roots. After taproot disease, the whole root will rot in severe cases. In July and August, the weather is hot and humid, and the disease is serious; In addition, the water in the field is rotten, which is very serious.

Prevention and control methods:

(1) Drain in time after rain;

(2) Before planting, soak the root tuber in 25% carbendazim solution 200 times for 65438+/-00 minutes, dry it and plant it;

③ The diseased plants were watered with 50% carbendazim 800 ~ 1000 times solution or 50% thiophanate methyl 1000 times solution at the onset stage.

(3) Viral diseases

The leaves of infected plants are flower-leaf-shaped, the plants shrink and the leaves curl, which seriously affects the growth and development.

Prevention and control methods:

(1) Select disease-free plants for seed retention;

(2) increasing the application of phosphorus and potassium fertilizer to enhance the disease resistance of plants;

③ Pay attention to the prevention and control of poisonous and harmful organisms.

(4) Underground pests include grubs, grubs, cutworms, etc. They are controlled by conventional methods.