First, rotten fruit caused by rotten rot. Cotton rot, also known as brown rot, mainly affects immature fruits. Firstly, a smooth brownish-brown spot appeared on the top of the fruit or fruit shoulder. Sometimes there was a small amount of white mold. Afterwards, concentric ring-shaped spots gradually formed, and the color changed to dark brown. The subcutaneous pulp also turned brown, and the entire fruit rotted and fell off later.
Prevention and control measures: timely removal of diseased fruit, bring out of field treatment; pay attention to pruning, improve ventilation and light conditions in the field; in the early stage of disease, spray 25% Rhodiola sp. 800 to 1000 times and 75% chlorothalonil 600 to 800 times in time. Or 70% mancozeb 400 to 600 times liquid, spray once every 7 to 10 days, even spray 3 to 4 times.
Second, rotten fruit caused by soft rot. Soft rot often occurs on green fruits. The skin of the disease remains intact, but the internal flesh is rapidly rotted and has a bad odor and is easy to fall off. After drying, it forms a white, stale fruit.
Prevention and control measures: Early pruning and squatting, avoiding rainy weather or pruning before the dew has dried; timely controlling pod pests and insect pests, reducing insect damage; before the onset or early onset, promptly use 150 to 200 ppm agricultural streptomycin solution or 70% addicts Pine 1000 times spray control.
Third, anthrax caused by rotten fruit. Anthracnose mainly invaded immature fruits, and the diseased part was born with water-stained and transparent small spots. It was brown after expansion, slightly depressed, with concentric ring patterns, dense black spots on it, and secreting pale red viscous material, and finally the entire disease. Rotten or shedding.
Prevention and control measures: timely harvesting of fruit, timely removal of disease; before onset or early onset, timely use 70% mancozeb 400 to 600 times, 75% chlorothalonil 600 to 800 times, 50% carbendazim 800 times or 80% of anthrax 800 times spray control.
Fourth, Fusarium fruit rot caused by rotten fruit. Fusarium fruit rot mainly damages mature fruits. The diseased part begins to look pale, and then turns brown. There are no obvious edges. After spreading, it spreads throughout the whole fruit. When the humidity is high, the diseased part produces densely reddish cotton-like mycelium, causing fruit rot. .
Prevention and control measures: timely removal of the disease, and centralized treatment; prevent the contact between the fruit and the ground; spraying 50% DT500 times liquid or 36% thiophanate-methyl suspension 500 times before the fruit is colored.
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