The major diseases in tomato growing in solar greenhouses include leaf mold, gray mold, late blight, and wilt disease. Vegetable farmers should pay attention to prevention and control.

First, leaf mold

Symptoms: The disease is mainly harmful to the tomato leaves. The yellowish chlorotic spots are not obvious in the outline of the newborn. The back of the lesions is grayish white, with dense gray edges on the edges, middle grayish yellow to browny mildew, and severe diseased leaves curling from the lower part to the upper part. Withered, the bacteria can also infect stems, flowers, and fruits.

Control methods: Proper isolation of nursery and tomato production sites to prevent infection at seedling stage; Strengthen ventilation and reduce moisture at night; Use 75% chlorothalonil powder 600 times solution or 70% Mancozeb WP in the initial stage of disease. 500 Double liquid spray control, alternate medication, 7 days, continuous medication 3-4 times.

Second, gray mold

Symptoms: The disease is harmful to the stems, leaves, and fruits of the tomatoes. The skin of the fruit begins to appear gray and white. When the disease is wet, the disease director produces a grayish-green to brownish brown moldy layer. After the fruit loses water, it becomes ossified. The leaves were yellowish-brown in color, with ridges in the middle, drooping leaves that were sick, and brown molds on the lesions when wet. Control methods: pay attention to ventilation; water the day before the watering, increase the amount of air after pouring; thoroughly clear the diseased leaves before flowering, timely removal of fruit after flowering, carried to the shed to bury; first fruit before flowering, with 45 % of chlorothalonil smoke agent smoke, 300-400 grams of acres.

Third, late blight

Symptoms: The leaves develop dark brown, water-soaked lesions, then spread to the stems, causing the seedlings to wilt. The pathogenesis of adult plants begins with the tips of leaves and leaves.

Control methods: The diseased plants were found to remove diseased leaves, diseased fruits or pullouts in a timely manner; sprayed with 75% chlorothalonil 600 times solution or 72.2% Prec 800 time solution.

D. Fusarium wilt

Symptoms: After the onset of the disease, the roots, stems, and leaves of the tomato were damaged, and the leaves on one side of the stem turned yellow. Finally, the whole plant was brown.

Control methods: results increase ventilation and reduce soil moisture later in the experiment; Skeprick was diluted 600 times before planting or after planting and before the expected period of disease, and the roots were irrigated once every 7 days. The number depends on the condition.

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