Prevention and cure of spot blight of celery in greenhouse
The disease mainly damages the leaves, followed by the petioles and stems. The old leaves first became ill. The lesions were light brown in oily spots. The edges were obvious. Afterwards, they developed into irregular spots. The color changed from light yellow to grayish white, and the edges were dark reddish brown. There is a yellow halo around the spot. Petiole, stem lesions brown, slightly concave depression, scattered black dots in the middle, when dry leaves dry rotten.
To control celery spot blight, attention should be paid to balanced fertilization. Basal fertilizer should be applied with fully decomposed organic fertilizer. Topdressing fertilizer should increase phosphorus and potash fertilizer, control the amount of nitrogen fertilizer, pay attention to supplementing trace fertilizer, and enhance plant resistance. When flooding, flood irrigation is not allowed. In the early stage of disease, use 70% mancozeb WP 600 times, or 50% carbendazim WP 600~800 times, 7~10 days, continuous control 2~3 times, better Control effect. In case of high humidity or rainy weather, aerosol or dust can be used for prevention or control, or 45% of chlorothalonil smoke agent per acre can be used to smoke 250 grams.
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