There are many reasons for the rolling of tomato leaves. The main ones are the following: 1. Viral diseases: Viral diseases are generally transmitted by insecticidal insects such as aphids and whiteflies. The susceptible plants are dwarf and the leaves are curled. In severe cases, the leaves only have leaf veins but no mesophyll. Prevention and control: In addition to the selection of antiviral strains and the implementation of crop rotation, in the initial stage of disease, 1000 times potassium permanganate is sprayed to cure both diseases such as viral diseases and soft rot, and virus A(K) can also be added to 50 kg of clear water. 100 grams, 50 grams of green Fenwei and 25 to 30 grams of a net again, made of mixed liquid spray control, spray once every 6 to 7 days, and even spray 2 or 3 times. 2, hormone harm: 2,4-D and chlormequat and other hormones used too much or too high, the tomato leaves or growing points will be bent, the new leaves can not be normal expansion, leaf edge distortion, stem bulge The color becomes lighter. Prevention: Natural alizarin 3000 times can be used to prevent and cure. 3, Astragalus membranaceus damage: the leaves become narrow, stiff upright, shrinkage or distortion, and finally bald tip. Prevention: can be used 1.8% alfreddine 3000 times or 20% of the net to prevent death spray 2000 times spray, spray every 6 to 7 days, and even spray 2 or 3 times. 4. Phosphorus deficiency: The diseased plant had purple backs, brown spots on the leaves, the lower leaves rolled up, the old leaves turned yellow, and the dark brown leaves were dead. In general, the low temperature of tomato seedlings will affect the absorption of phosphorus, and soil acidity or stickiness can also lead to phosphorus deficiency in plants. Prevention: Apply phosphate fertilizer, spray 0.3% potassium dihydrogen phosphate. 5. Magnesium deficiency syndrome: In the first inflorescence expansion period, the old leaves in the lower part of the diseased plant become chlorotic, yellowing occurs between the veins, and then it expands upwards to form the yellowing leaves, and the leaves with severe leaves or leaf margins are rolled up. Prevention: Increase nitrogen, phosphorus, potassium vegan fertilizer or foliar spray magnesium sulfate 50 to 100 times liquid.
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