Symptoms The occurrence of cotton bolls in the late Yellow River Basin and the cotton fields in the Yangtze River Basin occurred from time to time. It was observed that cotton bolls and anthrax-infested cotton bolls mainly occurred on the cotton bolls. The surface of the cotton bolls had a layer of gray fluffy mildew, and the bolls caused severe dry rot. .
Disease analysis Botrytis cinerea Pers. ex Fr. said Botrytis cinerea, a fungus belonging to the genus Fungi. Conidiophore stalks are slender, numerously clustered, branched, dark brown, apically 1-2-branched, clustered conidia on top of branches into grape spikes, stem size 960-120016-22 (μm); The molecular spores are colorless and the short ovals gather into a heap, gray, 12-189-13 (μm) in size, and bacteria can form sclerotia.
Transmission pathways and disease conditions are mainly wintered by sclerotia in the soil or by hyphae and conidia on the diseased body. The conditions are suitable for the following year. The sclerotium is germinated to produce mycelia, conidiophores, and conidia. The conidiospores fall off after ripening, and are transmitted through air, rain, or dewdrops, and agricultural operations. Germination occurs when germ tubes sprout from the host. Or senescent organs and dead tissue invade, after the onset of disease in the disease and then produce conidia for reinfection. The bacteria is a weak parasite that can rot on organic matter. Developmental optimum temperature 20-23 °C, the highest 31 °C, the lowest 2 °C. For the humidity requirements, the relative humidity of air is more than 85% or the relative humidity of the microclimate of cotton field is higher than 90%, which is conducive to the occurrence and epidemic of the disease.
Control methods (1) Proper close planting should not be too dense. (2) Strengthen field management, timely weed control, timely drainage after rain, and prevent moisture from staying in cotton fields. (3) Begin spraying 40% polysulfide suspension or 50% carbendazim WP or 60% anti-mildew ultrafine powder 600 times, 50% mixed sulfur suspension or 70% thiophanate-methyl Wet powder 500-600 times liquid, 50% quick-inking WP or 50% acetaminophen wettable powder 1500-2000 times liquid, 90% aluminum triethylphosphonate wettable powder 800 times liquid plus 50% acetaminophen WP 2000 times, 50% acetaminophen WP 2000 times, 50% thiophanate-methyl WP 1000 times, every 7-10 days, every time good liquid spray 65 -75L, total 2-3 times. The area where resistance to the above fungicides can be used can be changed to 65% tokamycin wettable powder 1000 times solution (Wanhao Ling 1@#) or 50% polymyxin WP 800 times solution (Wanhao Ling 2@# ). Every 10-15 days, control 1 or 2 times.
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