Effect Of Host Plants On Development Of Bemisia Tabaci And Delphastus Catalinae

The development, survival and reproduction of Bemisia tabaci (Gennadius) on four species of host plants [tobacco (Nicotiana tabacum L.), poinsettia (Euphorbia pulcherrima Willd), golden dewdrop (Duranta repens L.), Chinese hibiscus (Hibiscus rosa-sinensis L.) ] were studied in different temperatures. The inhabit and feeding preference of adult B. tabaci to four species of host plants were studied. The preference of adult B. tabaci to the odour of four species of host plants were tested by using Y-tube olfactory. Moreover, the development, survival, reproduction and predatory quantity, also and starving endurance of Delphastus catalinae on three species of host plants (cauliflower, tobacco, golden dewdrop) were studied. We successfully reared Delphastus catalinae by using B. tabaci hosting on three species of host plants (cauliflower, tobacco, golden dewdrop).The main results obtained were as follows:1. B. tabaci developes not well on four species of host plants at 36℃. The development duration of B. tabaci on four species of host plants become short with temperature increasing from 16℃to 31℃. Reared on tobacco, Chinese hibiscus, golden dewdrop and poinsettia, the development duration from egg to larva of B. tabaci are 13.88, 19.48, 20.69 and 22.11 days at 31℃respectively. From 26℃to 31℃, the total survival rate from egg to adult are highest on four kinds of host plants., with the highest (62.63 % ) on tobacco and the lowest (44.89% ) on poinsettia. The longevity and reproduction of adult B. tabaci are highest on four species of host plants at 26℃, with the longest (female:27.33days, male:20.33days) on tobacco and the lowest(female: 10.75days, male:10.50days)on Chinese hibiscus. The average numbers of eggs laid by per female are highest on four species of host plants at 26℃, with the highest (337.80) on tobacco and the lowest (57.20) on Chinese hibiscus. Tobacco and golden dewdrop are the best host plants for mass rearing of B. tabaci at 26℃, and the population trend index of B. tabaci on four species of host plants were 117.95 on tobacco, 107.86 on golden dewdrop, 37.86 on poinsettia and 16.24 on Chinese hibiscus respectively. The physique difference of B. tabaci is not obvious on four host plants.2. The inhabit and feeding preference of adult B. tabaci to four species of host plants are 38.72% on tobacco, 37.88% on golden dewdrop, 18.44% on poinsettia and 4.96% on Chinese hibiscus respectively. B. tabaci could be attracted by the odour of four plants, and the difference is obvious between different kinds of plants.3. The differences of development, survival, reproduction, physique size and predatory quantity of D. catalinae are not obvious reared on three species of host plants(cauliflower, tobacco, golden dewdrop), but the total survival rate of D. catalinae from egg to adult on cauliflower(73.33%) and on golden dewdrop(75.00%) are higher than that on tobacco(61.67%). The predatory quantity of larva D. catalinae becomes high with instar increasing, and the adult females are better than the adult males on predatory quantity.