Sclerotinia sclerotiorum can harm leaves, petioles and stems. The first leaf is usually diseased, with dark stains, and a dense layer of white mold on the surface when wet. Then spread downward causing petiole and stem disease. The victim’s site was brownish water-stained. When the speed was high, soft rot was formed. White hyphae grew on the surface. Finally, the stalk tissue rotted and hollowed in the fibrous stem, forming black sclerotia of mouse excrement. Farmers must pay high attention to the disease. Early detection, early prevention, and loss reduction.
The law of onset: ascospores spread by wind and rain, invade the old leaves of weak life, sick leaves and robust leaves, stem contact can spread hyphae. High temperature and humidity are conducive to the occurrence and epidemic of the disease. It is easy for celery to connect with fleas or cruciferous vegetables that are prone to sclerotinia. Poor drainage during the rainy season, with a heavy nitrogen fertilizer.
Control methods: spraying 70% thiophanate-methyl wettable powder 600 times, 50% carbendazim wettable powder 500 times, or 65% triamcinolone wettable powder 1000 times in the early onset, 5-7 days Spray 1 time, continuous control 2 to 3 times. The above pesticides are used alternately to avoid drug resistance.
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