Answer: Root-knot nematode disease is a common destructive disease in celery fields in sunlight greenhouses. The lighter ones reduce the yield by 20% to 60%, and the severer ones will never harvest. Solar greenhouse is difficult to rotate and stubble due to the limited conditions. It is one of the most troublesome greenhouse diseases for vegetable farmers.

The prevention and control of celery root-knot nematode disease should be based on prevention. Firstly, choose the stubble field that has not grown vegetables for many years to establish a solar greenhouse; secondly, choose disease-free plots for celery seedlings and treat them to prevent celery seedlings; The main control drugs are avermectin and thiazophos. The dosage is 2000-3000 grams per 10% thiazophos particles at the time of transplantation. During the growth period, 1.8% azectomycin 3000-4000 times solution can be used, 500 per plant. Root irrigation can better control celery root-knot nematode disease and ensure the benefits of celery.

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