To elucidate the effects of soil NPK-fertilization on the relationship between host plant and sweet-potato whitefly (Bemisia tabaci) , infestation and development of whitefly on potted cucumber plants under different fertilizer treatments were investigated. Results show that soil NPK-fertilization has significant effects on larval duration, survival rate of old nymphs and nymph size ; non-significant effects on survival rate of whitefly egg and young nymphs. Adult whitefly prefers treated cucumber plants with medium concentration of nitrogen ...