Seasonal Incidence of Insect Pests of Mustard (Brassica juncea L.) and their Correlation with Weather Parameters

Seasonal incidence of mustard insect pests and their correlation with weather parameters during Rabi, 2021-22 revealed that aphid Lipaphis erysimi (Kalt.),infestation began from 51 st standard meteorological week (SMW) and reached at peak (126.20 aphid 10 cm -1 terminal shoot) on 4 th SMW while the painted bug, Bagrada hilaris (Kirk.)infestation was observed twice during the cropping season.First infestation was recorded in 45 th SMW (0.60 bugs plant -1 ) and second infestation occurred from 8 th SMW to 10 th SMW (5.13 bugs plant -1 ).The peak activity of the flea beetle, Phyllotreta cruciferae (Goeze) was noticed on 4 th SMW (0.93 beetles plant -1 ) whereas the leaf webber, Crocidolomia binotalis Zell.infestation reached to peak (2.87 larvae plant -1 ) on 6 th SMW.The mustard aphid exhibited a noteworthy negative correlation with minimum temperature, whereas it demonstrated a distinctly positive correlation with morning relative humidity (RH).Flea beetle and leaf webber were significantly negative correlated with minimum temperature.Painted bug was significantly positive with maximum temperature while significantly negative correlated with evening RH.