What is Verticillium?

Verticillium wilt is a more serious vascular disease. Its pathogens are mainly Verticillium dahliae Kleb and Verticillium alboatrum. Fungus.

[huáng wi bìng]

Verticillium wilt is a more serious vascular disease. Its pathogens are mainly Verticillium dahliae Kleb and Verticillium alboatrum. Fungus.

The suitable growth temperature of Verticillium nigra is lower than that of Verticillium dahliae. There are many reports on solanaceous plants and chief plants; and because Verticillium dahliae is extremely extensive, its ability to adapt to high temperature and severe temperature changes is strong, so it is mainly used on many plants infected with Verticillium wilt, such as cotton. Verticillium dahliae were reported.

Chinese name

Verticillium wilt

Alias

Cyanosis

Latin name

CYANOSIS

English name

greensickness

door

Deuteromycotina

Branch

Acetospidae

Genus

Verticillium

Open field cultivation, from about 1 month after planting, symptoms appeared on the ground and continued to develop until the end of harvest. Initially, the lower leaves partly wilted and the leaf edges curl up. After 2-3 days, the diseased area changed from yellowish white to yellow. The edge of the leaf is discolored more and wedge-shaped with the leaflet as the center. Next, the discolored area gradually expanded, the whole leaflet became yellow, and slowly browned and died. When the disease is aggravated, the upper leaves also die and die in turn, which causes the lower leaves to wither. As a result, the height of diseased plants is reduced, and fruit set and growth of fruit are significantly affected. The petiole of the diseased plant was neat and neat, and the brown part of the duct was visible.

In Japan, in addition to tomato, eggplant, green pepper, and white melon are also affected. Melons, grass poems, okra, cabbage, radishes, butterbur, angelica, thorns, old beans, soybeans, chrysanthemums, roses, etc., are widely hosted. The pathogen has different systems for the pathogenicity of tomato, and is divided into three pathogenic types. In addition to hyphae, conidia and sclerotia are also formed. Sclerotia are persistent organs generated by spore division of hyphae. They are produced in large numbers on diseased plants and overwinter in the soil in the form of sclerotia. These sclerotia spread with the residue of diseased plants through wind and rain, and spread to the surroundings. In addition, infected seedlings can also bring the germs to non-affected areas. When the seedlings are transplanted, the sclerotia germinates out of the germination tube to grow hyphae, and the plant is infected by the root apex and the wound. The bacteria that invade the plant mainly multiply in the duct, hinder the rise of water and produce toxins, causing the plant to wither.

The temperature of the disease is about 25 , and the disease is easy to happen when the temperature reaches 22 28 . Therefore, the summer and autumn tomato cultivation in the mountain area and the open field cultivation in the flatland are more common. The incidence rate of tomato cropping fields and plots with high rotation frequency of eggplant, strawberry and soil angelica were higher. The damage is particularly serious when the bed is not thoroughly disinfected. Currently, many resistant varieties are on sale. At the same time, care must be taken to avoid continuous cropping of tomato or rotation with eggplant, and to disinfect the soil in time. For disease-prone plots, soil or cultivate resistant varieties should be disinfected.

I. Eliminate sporadic wards, control minor wards, and transform severe wards

Second, seed disinfection

Third, health cultivation. Reduce the number and concentration of organophosphorus pesticides such as phoxim and methamidophos to prevent damage to cotton plants and reduce their disease resistance. Do not use partial or excessive nitrogen fertilizers, do a good job of combined application of nitrogen, phosphorus, and potassium, and pay attention to increasing potassium fertilizers to improve disease resistance. Improving the ecological environment of cotton fields makes the soil temperature of cotton fields higher, but the humidity should not be too large. Avoid flooding with large water to reduce the incidence.