Prevention and control of diseases and insect pests in walnut trees

There are many kinds of diseases and insect pests in walnut trees, and the control methods are different. Diseases include rot, black spot, branch blight, brown spot, powdery mildew, anthracnose and so on, which can be prevented by spraying stone-sulfur mixture before budding or flowering. Insect pests are raised-limb moth, Jibai dirty lamp moth, horned spot ancient poisonous moth, cloud spot longicorn beetle, grass paramecium, small gibberellin, aromatic bark moth and so on, which should be sprayed before the occurrence of insect pests.

What are the diseases and insect pests of walnut trees?

The diseases of walnut trees include rot, black spot, branch blight, brown spot, powdery mildew, anthracnose and so on.

The main results are as follows: 1. Walnut rot mainly harms the cortex of the trunk, the disease is at its peak in spring and autumn, and the damage is the most serious from mid-April to late May. In general, walnut trees with extensive management, barren soil layer, poor drainage, insufficient fertilizer and water, weak trees or suffer from freezing injury and salt injury are easy to be infected with this disease.

2. Black spot of walnut: it mainly harms leaves, new shoots and fruits. The pathogen generally overwinters in branches or buds, and the bacterial liquid secreted in spring is transmitted by wind and rain.

3. Walnut limb moth: most of them began to damage from June to July, mainly harming fruits and leaves, the pericarp blackened and began to sunk, causing early fruit drop, high soil moisture and serious weeds.

Second, how to control the diseases and insect pests of walnut trees?

1. Walnut rot: do not apply nitrogen fertilizer, increase phosphorus and potassium fertilizer to improve the disease resistance of the plant; do a good job of ventilation and humidity reduction, reduce or avoid leaf dew; appropriate irrigation, rainy days or afternoon should not be watered to prevent frost injury. Spraying stone-sulfur mixture before the occurrence of the disease can control the disease; remove the remains of diseased plants, diseased fruits, diseased leaves and diseased branches in time during the onset of the disease, and thoroughly remove the diseased leaves and remains after pulling seedlings.

2. Black spot of walnut: protect the tree general on the trunk and branches after defoliation, hinder the reproduction of germs on the tree; for the trimming mouth and wound, smear the callus anticorrosive film in time to prevent the invasion of bacteria and Rain Water pollution; for diseased trees, timely spraying chemical control.

3. Walnut limb moth: in late autumn or early spring, turn deeply the soil under the canopy to destroy the winter cocoon; in the peak spawning period of adults and the early hatching period of larvae, spray fenitrothion or phoxim to destroy the larvae before fruit decay; spray phoxim before adult Eclosion or when individual adults begin to Eclosion, poison unearthed adults.