The relationship between the different temperatures and the development period of the greenhouse whitefly, Trialeurodes vaporariorum and the tobacco whitely, Bemisia tabaci (Homoptera: Aleyrodidae) and their parasitoid, Encarsia formosa (Hymenoptera:

摘要

The relationship between the different temperatures and the development period of the paiasitoid, Encasria formosa Gahan (Hymenoptera: Aphelinidae) which associated with the greenhouse whitefly, Trialeurodes vaporariourm (Westwood) (Homoptera: Aleyrodidae) and the tobacco whitefly, Bemisia tabaci (Cenn) (Homopteta: Aleyrodidae) under laboratory conditions. The results indicated that the parasitoid and its host were affected by the different temperatures. The development period of T. vaporariorum was67, 23 and 19 days at 20,29, 26.4 and 3.3.5 °C, respectively. The development peiiod of the parasitoid, E formosa when associated with T, vaporariorum from egg stage to adult was 46, 21, 3 days at 19.61, 24.41, 21 20 °C, respectively. While, the development period of the whitefly B. tabaci was 80, 22,12 days at 18,25 9 and 35,36 °C, respectively. The development of the parasitoid associated with B. tabaci from egg to adult was 49, 20 and 28 days. The optimal temperature for the development of E. formosa was 27 °C and the depuration was 3 days when the parasitoid associated with T vaporariorum. These results agree with the findings of the pervious studies.