At present, the high humidity in the field is conducive to the occurrence and harm of celery sclerotinia, and farmers should pay attention to observation, early detection, early prevention and control, and reduce losses.

First, the hazard characteristics

Sclerotinia disease can damage the leaves, petioles, and stems of celery. Generally, the first disease of the leaves begins with a dark stain, and the surface of the white mold layer is dense when wet. Then spread downward causing petiole and stem disease. The affected area was brown water-stained, and soft rot formed when the humidity was high. White hyphae grew on the surface. Finally, the stalks rotted into fibrous shapes. The stalks were hollow, forming rat worm-like black sclerotia.

Second, the incidence of the law

The pathogen spreads by wind and rain, infects the old leaves whose life is weakened, and the diseased leaves and leaves touch the strong leaves and stems to spread the mycelium. 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. Drainage is poor, and the incidence of partial nitrogen fertilizer is heavy.

Third, control methods

1. Agricultural control. Implement more than three years of rotation. Seed disinfection before sowing. Drain the water in time to reduce the humidity in the field. The diseased leaves were removed from the fields in a timely manner, concentrated deep, and prevented from spreading.

2. Chemical control. Spray 70% thiophanate-methyl wettable powder 600 times, 50% carbendazim wettable powder 500 times or 65% texasin wettable powder 1000 times in the initial stage of disease, spraying once every 5-7 days. Prevention 2-3 times. The above pesticides are used alternately to avoid drug resistance.

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