author(s)
Kavita Kumawat, BL Jat and Rekha Kumawat

abstract
The present investigation was conducted to study the Seasonal Incidence of Thrips, Thrips tabaci on Onion at Horticulture farm, Department of Entomology and Laboratory during December to May (Rabi) of 2008-09. The incidence of thrips on onion was commenced in the third week of February (3.66 thrips / plant) and reached to it’s peak in the last week of March (40.32 thrips / plant). Whereas, the predator, Coccinella septumpunctata Linn. was commenced in the last week of February (0.10 / plant plant) and reached to maximum in the last week of March (3.40 / plant), thereafter, declined and completely disappeared in the last week of April. The correlation studies revealed that the thrips population had non significant positive correlation with the temperature and non significant negative with the relative humidity whereas; the population of predator C. septumpunctata was significantly positively correlated with thrips population (0.949).