Abstract: According to the method of indoor net cover catch insect to detect the selection index greenhous whitefly [Trialeurodes vaporariorum (Westwood)] to host plants, the number of distribution and the amount spawning of greenhouse whitefly on host plants, and measured the content of chlorophyll and leaf thickness of host plants. The results showed that the greenhouse whitefly had obvious selectivity difference to different host plants, greenhouse whitefly preference for the host were string beans, cowpea, cabbage, zucchini, tomato, no-string beans, cabbage without balls, rape, cucumber. The suitable host plants included pepper, Physalis pubescens, cherry radish, lettuce, okra, Dutch bean, endive, Shanghai green, mantang red radish, pea, color pepper, lettuce, chrysanthemum coronarium, spinach, Chinese cabbage, green amaranth with round leaves. The non-hobby host palnts were leeks, coriander and celery. Greenhouse whiteflies were more likely to land on the plant leaves with pubescence. The total of greenhouse whitefly was connected with the content of chlorophyll in the host plants, and no correlation with the thickness of host plant’s foliage.

Key words: greenhouse whitefly[Trialeurodes vaporariorum(Westwood)], host selectivity, hobby host, chlorophyll, leaf thickness, leaf hairs