Abstract: Probing and feeding behaviors of the whitefly Bemisia tabaci B biotype on cabbage (Brassica oleracea L. var. caqitata), summer squash (Cucurbita pepo L.) and hot pepper (Capsicum annuum L.) were recorded respectively using electrical penetration graph (EPG) technique. The results showed that the adaptability of the whitefly varied with plant species, i.e., cabbage>summer squash>hot pepper. Out of 25 individuals recorded on each host plant species, 24, 19 and 15 individuals reached phloem while 22, 10 and 1 individual(s) had sustained sap ingestion on cabbage, summer squash and hot pepper, respectively. Before they reached the phloem (the first period), the percentage of whitefly non－probing were 9.59%, 23.55% and 36.97% respectively on host plant species in the same order as above. After they reached the phloem (the second period), whiteflies behaved similarly in terms of four parameters on cabbage and summer squash. In the third period, new probes after 1st sustained ingestion on cabbage leaves (4.73) were obviously less than on summer squash (13.40). Observations on the probing and feeding behaviors of free whiteflies confirmed the EPG results as above:  the percentages of whiteflies stayed on leaves within 60 min were 100%, 88% and 28% on cabbage, summer squash and hot pepper, respectively.  

Key words: Bemisia tabaci B biotype, host plants, EPG, probing and feeding behaviors