بررسي ويژگي هاي زيستي تريپس پياز THRIPS TABACI )THYS: THRIPIDAE( روي خيار فلفل و بادمجان در شرايط آزمايشگاهي

Life history parameters of Thrips tabaci (Thys.: Thripidae) on cucumber, sweet pepper and eggplant under laboratory conditions

Onion thrips, Thrips tabaci Lindeman, is one of the most important pests of vegetables and ornamentals all over the world. Its role has been proved in the transmission of different viruses to several plants. in this study, life history parameters of T. tabaci were calculated on three host plants, cucumber, sweet pepper and eggplant. Experiments were conducted at 25 ± 1°C, 60 4 10% R.H. and photoperiod of 16: 8 (L: D) hours. The results showed that host plants affect life history of onion thrips significantly. Intrinsic rate of population increase (rm) was 0.296, 0.158 and 0.234 female on female per day on cucumber, sweet pepper and eggplant respectively. Other parameters like A. (finite rate of increase) were 1.334, 1.171 and 1.264; T (mean generation time) were 14.879, 19.092 and 16.779; DT (doubling time) were 2.343, 4.384 and 2.956 days. Finally, R0 (net reproductive rate) was 81.581, 20.461 and 51.141 female/female in one generation. With regard to highly significant effect of host plants on life history parameters of onion thrips, it is probable that this problem could be used for control of onion thrips on sweet pepper more effectively than on cucumber and eggplant.