B型烟粉虱在甘蓝、西葫芦和辣椒上的刺吸取食行为

利用刺吸电波技术（EPG）记录了B型烟粉虱Bemisia tabaci在甘蓝Brassica oleracea L. var. caqitata、西葫芦Cucurbita pepo L.和辣椒Capsicum annuum L.上的刺吸取食波形。结果表明，3种寄主植物的适合度为甘蓝>西葫芦>辣椒。在所观察的25头烟粉虱中，到达甘蓝、西葫芦和辣椒韧皮部的个体数分别为24、19和15，其中持续吸食头数为22、10和1。在第一阶段（从刺吸开始到第一个E(pd)1出现），烟粉虱在甘蓝、西葫芦和辣椒3种植物上非刺探时间所占比例分别为9.59%、23.55%和36.97%，三者差异显著； 在第二阶段（从第一个E(pd)1出现到第一次韧皮部持续吸食），烟粉虱在甘蓝和西葫芦上所考察的4个指标无显著差异； 在第三阶段（从第一次韧皮部持续吸食至记录结束），烟粉虱在甘蓝上第一次韧皮部持续吸食后的刺探次数（4.73）显著低于在西葫芦上的刺探次数（13.40）。在自由状态下，烟粉虱60 min内在甘蓝、西葫芦和辣椒上留存粉虱的百分比分别为100％、88％和28％，这进一步验证了上述依据EPG记录得到的结果。

Probing and feeding behaviors of the whitefly Bemisia tabaci (Gennadius) B biotype on three host plants

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.