Dong Xin and Dong Yanbin A: According to the relevant situation reflected by the fruit farmers, combined with the comprehensive analysis of the photos taken, the author believes that this is a typical symptom of grape coal pollution. This disease is also called grape soot, coal spot disease, fly fly disease, which is more common, not only affects the photosynthesis of grape branches and leaves, causing the plant to grow weak, but also when the fruit grows to begin to soften, in fruit Small black spots appear on the surface, which are scattered like fly and feces, which significantly reduces the quality of the fruit. The disease occurs on the leaves, petioles, branches, cobs and fruit granules of the grapes. It is dark brown spots at the beginning of the disease. The lesions are continuously enlarged and then joined together to cover the entire leaf. There are also obvious small black spots on the new shoots and green fruit, and the fruit is not corrupt. The disease begins to develop after the flowering of the grapes until the grapes are harvested. The pathogen is called the genus Pseudomonas, and the fungus of the fungus. The pathogens are overwintered on the host by hyphae and conidia. When the temperature is appropriate in the spring of the next year, they are spread by airflow, rainwater, insects, etc., and are repeatedly parasitized on the surface of the plant. The growth temperature of the pathogen is 20-25 °C, and the suitable temperature for mycelium formation is 25 °C. Under the conditions of poor climate, excessive rainfall, canopy closure in the vineyard, and high humidity, the disease is likely to occur more seriously. Insects that secrete honeydew, such as aphids, scale insects, and spotted wax mites, are also closely related to the disease. Control method: 1. Select resistant varieties, timely remove the residuals of the diseased plants in the park, concentrate on destruction, and reduce the source of bacteria. 2. During the dormant period of the grape, spray 5 Boss sulphur sulphur mixture or 21% peroxyacetic acid water solution 300 times to eliminate the overwintering bacteria source. 3. Do a good job of pest control, spray 5.7% full kill one end (avermectin + special effects) EC 750 times liquid, ~ medicine more treatment, high efficiency and low toxicity, the effective period of up to 15 to 20 days. 4. Chemical spray control: 50% Sino-American Yefu (chlorobromoisocyanuric acid) wettable powder 750 times liquid, 80% Dingjia (full complex mancozeb) wettable powder 900 times liquid, 70% US Baolu (Prozin carbendazim) WP 1000 times solution. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone
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Grapes have a coal pollution
Question: Recently, the greenhouse growers in Daming County, Bengbu City consulted: more than 20 acres of grapes that had just entered the fruiting stage, a small black spot resembling smoked on the leaves, the edges of the lesions were not clear, and they were wiped by hand. Rubbing is easy to fall off, and people who have asked several pesticides in the market can't tell what disease they are, how should they be prevented?