Abstract: The broad mite,Polyphagotarsonemus latus(Banks),can stick to the greenhouse whitefly，Trialeurodes vaporariorum for longdistance dispersal.Cage experiment revealed that the phoresy of P.latus by whitefly is their biological characteristics,not the stress response to adverse environment.The ANOVA analysis showed:18～25℃ and 50%～75% RH were suitable for the phoresy,which coincide with their favorable living condition.High temperatures(32～39℃)speeded up sticking,but rate of phoresy decreased rapidly after 2 h.Effect of illumination on rate of phoresy was little.With mite density rising,both rate of phoresy and mite number on a whitefly increased obviously.85% of the phoretic mites clasped tarsi and tibia of the whitefly in a way of metapodosoma warping at an angle of about 45°.Examination by phase contrast microscope showed that the broad mite thrusted its stylet into the leg of the whitefly.Therefore the relationship between them still needs further research.

Key words: Polyphagotarsonemus latus, Trialeurodes vaporariorum, phoresy, environmentfactors