The initial diagnosis is a threat to thrips. Adults and nymphs of thrips damage the epidermis of the plant's heart and buds by sucking mouthparts and draw juice. After the leaves were damaged, many fine and long-gray white spots were formed. When the leaves were severe, the leaves were yellow.
Prevent methods: 1, remove weeds, strengthen fertilizer and water management, so that plants grow vigorously, reduce disease. 2, chemical control can be sprayed 1500 times Wan Ling liquid, can also be used 50% Dimethoate EC 1000 times, 10% Chrysanthemum EC 1500 times.
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