What is the reason for the blackening of tomato leaves? Recently, some netizens came to e-mail to inquire about the blackening of leaves in tomato planting. Zhengdao Fertilizer Network consulted relevant experts and summarized the possible reasons. The possibility of tomato ash leaf spot is more likely. The disease is mainly caused by leaves and fruits. At the beginning of the disease, the leaf surface is covered with dark round or irregular small spots, and the posterior along the veins expands to the periphery, showing an irregular shape. The middle part gradually fades to grayish to taupe, the lesions are slightly concave, and the smaller, extremely thin, late Easy to rupture, perforate or fall off.
According to experts, tomato gray leaf spot disease can be enhanced by applying bio-organic compound fertilizer and phosphorus-potassium fertilizer, and spraying foliar fertilizer to enhance its disease resistance. When breeding, you can choose resistant varieties. In order to prevent gray leaf spot when planting tomatoes, you can use "Steam" 50ml + "garlic oil" 15-20ml, once every 3-5 days, after the fight, turn to prevent. Preventive medication, fast net 30ml with water 15kg spray, the speed of the attack with 50ml plus garlic oil 15ml with water 15kg spray.
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