Application
1. Root Drenching: pymetrozine has good systemic activity. It can be transported in both xylem and phloem within plants. During planting, use a 1000-fold dilution of 25% pymetrozine wettable powder for root drenching. It effectively controls aphids, planthoppers, and whiteflies, with a residual effect of about 50 days.
2. Spraying: For controlling vegetable aphids, whiteflies, rice planthoppers, and leafhoppers, apply 15-20 grams of 50% pymetrozine water-dispersible granules per mu. After application, the insects die slowly after feeding, averaging about 60% mortality by 3 days post-application, and over 95% by 7 days. The residual effect lasts more than 25 days.