Classification and Control of Three Kinds of Diseases and Pests of Vegetables

In recent years, bacterial wilt, blight, and root-knot nematodes in vegetables have become more common in greenhouses. Their common symptoms are that they can cause wilting of damaged vegetable plants. Many vegetable farmers cannot distinguish them correctly, resulting in blind drug use and not only wasting The financial and material resources, more importantly, have delayed the good time for treatment, which has affected the growth of vegetables and even caused death.

First, the symptoms

Bacterial wilt and blight of vegetables are all infectious diseases. After the plants are damaged, the color of the vascular bundles gradually turns brown. In the early stage of damage, the leaves of the plants are wilted at noon, returning to normal sooner or later, and continuing to wilt at later stages. The diseased stems were cut and placed in a transparent glass filled with clear water. If there was bacterial wilt that overflowed with mucous, there was no mucous spillage and the yellow leaves on the lower part of the plant were blight. In the early stage of root knot nematode damage, the shoots grew poorly, the leaves were smaller than the normal leaves, the roots in the underground were reduced, beaded tumors were formed on the roots, and the pear-shaped white females were hidden in the root tissue. Inside.

Second, control methods

Blight disease occurs in severe vegetables such as cucumbers, etc., can be grafted with black pumpkin, zucchini, etc. to control. After the onset of bacterial wilt, we must reduce the humidity in the field and avoid flooding and flooding, and apply 77% of WP or 25% of WPWP to 1500 to 2500 times of liquid, each dose of 200 Ml. Root knot nematodes can be used to apply 1.8% of avermectin EC 1500 to 2000 times, about 250 ml per strain, every 10 to 15 days, once, and irrigation 3 times.

Author: Qu Hui Qin

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