Prevention of eggplant Verticillium wilt

Field symptoms of eggplant Verticillium wilt often occur after fruiting on the pod, and the disease analysis increases sharply in the fruit stage. At the early stage of disease, the middle and lower leaves of the plant chlorosis or chlorosis on the middle and lower leaves, and gradually develop upwards, so that half of the branches and leaves become yellow and dead, and the fruit is not rigid. Therefore, it is also called half crazy. In severe cases, the whole plant withered and the leaves dried off and became light stalks. Peeling the roots and stems of the cortex reveals that the vascular bundle has turned brown and is also known as black heart disease.

The cause of eggplant Verticillium wilt is a soil-borne disease, and soil-borne bacteria are the main source of pathogens. Verticillium dahliae, mycelium, chlamydospore, and pseudosclerotia are winterized in the soil along with the diseased plant residue, and generally can survive for 6-8 years. The pathogens mainly invade from root wounds and can also invade from the radicle and root hairs and propagate in the vascular bundles of plants. Therefore, cultivating or continuous cropping, the soil contains more bacteria, and the disease is heavy.

In addition, temperature is also an important factor affecting the occurrence of diseases. The general temperature of 20-25 °C is conducive to disease. From the time of eggplant colonization to the flowering stage, the more days the daily average temperature is below 15°C, the earlier the disease becomes heavier. The temperature is above 28°C and the disease is suppressed.

Soil heavy weight, saline-alkali soil, double cropping, partial nitrogen fertilization, roasting roots, planting roots, planting too thin, planting seedlings at midday sun, soil cracking, etc. In particular, watering on a cold day can easily cause an outbreak of Verticillium wilt.

Prevention and control methods to prevent the occurrence of eggplant verticillium wilt disease, when transplanting can be applied microbial agent 20-30 kg; after the onset of seedlings after the onset of gold micro-purpose multi-purpose 800 g, according to the 300-fold dilution of single plant irrigation In combination with irrigating roots, foliar sprays should also be carried out. Before the onset of disease, thiazole zinc 400 times and 6000 times liquid natural wolfberry Shuofeng 481 should be sprayed on the leaves, sprayed once every 8 to 10 days, and sprayed 2-3 times. For eggplants that have already undergone Verticillium wilt, roots that have started to rot should be set aside in time. For eggplants that have just begun to show signs of wilting, 300 times more gold micro-purpose or thiazole zinc 400 times can be applied to the roots. ; can also be used 50% copper chloride 300 times copper or 60% calcium dimethoate aluminum 500 times Irrigation root.

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