Incidence study of yellow mite and thrips and their natural enemies in relation to weather parameters on chilli
Arka Samanta, Koushik Sen and Indranil Basu
The present field experiment was conducted to study the incidence of yellow mite and thrips and their natural enemies and their interaction with the abiotic factors during 2012-13 at District Seed Farm (AB Block) of BCKV, West Bengal. The results revealed that the maximum mean mite population/leaf (7.25) was recorded on 02/05/2013 and the minimum population (3.54 mites/leaf) was registered on 17/04/2013. Highest mean thrips population (6.15/leaf) was recorded during 11/04/13 and 02/05/13 whereas the minimum population of thrips (1.85/leaf) was recorded on 17/04/13. The mean population of coccinellids maintained throughout the observation dates in variable number ranging from 0.25 to 2.05/plant whereas the mean spider population ranges from 0.58 to 1.40/plant respectively. Population fluctuation of yellow mite, thrips and spiders was found positively correlated with mean temperature and negatively correlated with total rainfall. Other abiotic factors (mean relative humidity, wind speed and bright sunshine) were found non-significant with the incidence of yellow mite, thrips and spider population. In case of coccinellids, none of the abiotic factors exerted influence on the population builds up in chilli ecosystem.