Summary of common seedling diseases and insect pests in spring

Spring is not only the season of recovery of all things, but also the season of high incidence of diseases and insect pests. Today, the editor summarized several prevention and control methods of diseases and insect pests that are most likely to occur in spring, hoping to be helpful to the prevention and control of seedling diseases and insect pests in spring.

Insect pests-scale insects

Main harm: scale insects mainly harm oleander, yellow poplar, holly, camphor and other seedlings.

Prevention and control methods:

1. Improve ventilation and light transmission conditions. Combined with pruning, the branches and leaves of diseases and insects will be cut off, centralized treatment, and reduce the source of insects.

two。 Drug control: it can be sprayed with 28% Cobao EC 1200 times or 40% Lesbon EC 800 times plus 10% imidacloprid 1000 times.

Insect pests-- yellow poplar silk borer

Main harm: melon seeds, yellow poplar, sparrow tongue and other seedlings.

Prevention and control methods:

1. Prevention and control should be carried out as soon as the harm is first seen. The overwintering larvae of the yellow poplar silk borer, Chilo suppressalis, on the seedlings should be checked at the beginning of March. It is found that the larvae are budding and should be controlled in time.

two。 Drug control: the drug can be sprayed 2500 times with 40% toxic silk EC or 25% cypermethrin EC.

Insect pests-aphids

Main harm: big leaf yellow poplar, red leaf plum, peach, begonia, pyracantha, crape myrtle, rose, oleander and other seedlings.

Prevention and control methods:

Drug control: 10% imidacloprid or 10% Jinshi 1500 times solution.

Insect pests-- longicorn beetles

Main harm: red leaf plum, plum blossom, peach blossom and other seedlings.

Prevention and control methods:

1. Deal with seriously damaged seedlings in time, prune them reasonably and strengthen seedling management.

two。 Drug prevention and treatment: plug the hole with 40% poison silk or 80% dichlorvos EC 30 times.

Disease-powdery mildew

Main harm: crape myrtle, peach, rose, narrow leaf ten meritorious service, big leaf yellow poplar and other seedlings.

Prevention and control methods:

1. Powdery mildew in spring should be based on the principle of "prevention first and comprehensive control".

two。 Maintain the growing environment of seedlings should be ventilated and ventilated

3. It was found that the diseased leaves should be cleared in time and sprayed comprehensively, and 1600 times solution of trimethoprim could be used for control, spraying once every 7 days and controlling 2 Mel continuously for 3 times.