author(s)
Satish Tirkey, Vikram Tigga and Ashwani Kumar

abstract
Observation for incidence of thrips and natural enemies of the thysanopteran pest were recorded in each meteorological week until harvesting of crop. Thrips population was analyzed Initial incidence of the chilli thrips was noticed on the 37^th standard week (September third week) with an average population of 0.32 insect / plant. The chilli thrips, Scirtothrips dorsalis population increased and gradually reached the peak level of 6.75 insect / plant at 45^th standard week (November second week). At that time, average maximum temperature was 37.77 ^oC and minimum temperature was 21.42 ⁰C, average morning relative humidity was 86.28% and evening 45.42%. There after declined trend was observed due to fall of maximum and minimum temperatures as optimum weather condition are decreasing. The natural enemies observed were two species of Coccinellid beetle and Spider. Similarly, incidence of the most commonly found natural enemies consisting of coccinellid beetle was recorded low as 0.92/plant 38^th standard week (September fourth week) to maximum of 5.87/plant 44^th standard week during (first week of November). When the average temperature, relative humidity and weekly total rainfall were average maximum temperature was 36.34 ^oC and minimum temperature was 26.71 ⁰C, average morning relative humidity was 85.14% and evening relative humidity 48.14% and weekly total rainfall 0.0 mm respectively. After which the pest population gradually decreased. Populations of spider were found to be low as 0.42/plant 39^th standard week (September five week) to maximum during 46^th standard week (November second week) 3.74/plant. When the average temperature, relative humidity and weekly total rainfall were average maximum temperature was 38.71 ^oC and minimum temperature was 25.74 ⁰C, average morning relative humidity was 83.85% and evening relative humidity 50.28% and weekly total rainfall 0.0 mm respectively. Population fluctuation of thrips and spider was found positively correlated with temperature and negatively correlated with total rainfall. Other abiotic factors (relative humidity, rainfall) were found non-significant with the incidence of thrips and spider population.