Just sprinkle the granules around the plant, cover with soil, and water in. The root system absorbs the material in 1 to 4 days and carries it through the entire plant. Sucking insects are killed when they start to feed on the plant. Especially useful on birch trees, roses and shrubs. Effective control of aphids or plant lice, birch leaf miner, lace bugs, leafhoppers, webworm, thrips, and whiteflies. One application lasts 6 to 8 weeks.