Introduction to the occurrence characteristics of grape black pox
The pathogen overwintered mainly as sclerotia on the disease spots of new shoots and tendrils. In the next spring, when the temperature was higher than 2 ℃ and the high temperature lasted for more than 24 hours, a large number of conidia were produced from the sclerotia, which were transmitted to the green young parts of grapes by Rain Water, and the conidia produced germ tubes in water and were quickly fixed to the substrate, which led to primary infection after germination. The disease is serious in areas with many Rain Water and high humidity, and it is easy to grow or mature due to low-lying orchards, poor drainage, poor ventilation and light penetration or partial application of nitrogen fertilizer, and young grape tissues, such as young leaves, ear grains or new shoots, are susceptible to the disease in the early stage of growth.
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Introduction to the symptoms of grape black pox
It is a fungal disease, which mainly harms the green tender parts of grapes, such as young fruits, leaves, petioles, pedicels, shoots and so on. Black pox disease can occur from sprout to late growth stage. Serious young fruit infection in spring and summer appears dark brown halo, like "bird's eye", disease spot can be connected into large spot, later spot hardening or cracking.
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Introduction to the prevention and control of grape black pox
1. Eliminate the source of bacteria. After falling leaves in autumn, the fallen leaves and diseased ears are removed and buried deeply, and the old bark scraped off should be burned immediately. When the grape bud scales sprout in spring, spray Baume 3-5 degree stone sulfur mixture + 0.3% pentachlorophenol sodium. 2. Strengthen the cultivation and management. Combined with summer pruning, carefully cut off diseased branches, diseased leaves and diseased fruit.
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