The Life History of Chrysanthemum Thrips, Thrips Nigropilosus Uzel (Thripidae:Thysanoptera) and an Evaluation of the Effects of Temperature on Its Life Cycle

The biology of Thrips nigropilosus Uzel was studied in a laboratory. The life history was examined at 20° C as well as the effect of temperatures on its life cycle at 12, 20, 25 and 30°C with fixed 70% r.h. The thrips pass through egg, two larval instars, prepupae and pupae to become adults. The development of these pre-adults occur on the pyrethrum plants except that prepupal and pupal stages occur in the soil. The emerged adults display sexual dimorphism, with lower ratio of male to female (2:11) and adult longevity range of 1–21 days.