Impact of different weather parameters on seasonal abundance of major sucking pests and natural enemies in bt cotton Matre Y.B.*, Zanwar P.R., Sonawane C.K., Lad A.G. Vasantrao Naik Marathwada Krishi Vidyapeeth, College of Agriculture, Department of Entomology, Parbhani - 431 402, Maharashtra, India *Corresponding authors' E-mail : yogesh.matre111@gmail.com
Online published on 20 December, 2024. Abstract During present studies major sucking pests namely aphids, leafhopper, thrips and whiteflies were observed infesting early growth stage and remained entire crop duration. There were three population peaks of aphids during 2019 and peak incidence was noticed in 33rd Standard Meteorological Week (SMW) (68.80 aphids per three leaf), however the peak incidence of aphids during 2020 observed in 36th SMW. Where as leafhopper Amrasca biguttula biguttula reached its peak population (15.40 per three leaves) in 37th and (11.70 per three leaves) in 35th standard meteorological week in 2019-20 and 2020-21. The thrips population maximum population (19.50 thrips per three leaf) was recorded on 42nd SMW in the years 2019-20 and (32.45 thrips per three leaf) was recorded in 43rd SMW in the years 2020-21, however whitefly reached its peak population in 41st SMW with a population (28.50 whiteflies per three leaves) in the years 2019-20 and (34.65 whiteflies per three leaves) was recorded in 42nd SMW in 2020-21. Aphids and leafhopper are the positive correlation with rainfall, temperature, relative humidity and evaporation and negative correlation with min temperature, wind speed and BSS, However maximum temperature, relative humidity showed positive correlation with thrips, Scirtothrips dorsalis and whitefly, Bemisia. tabaci population the rainfall is favorable the activity of thrips whereas the whitefly were unaffected by rainfall. Top Keywords Amrasca biguttula biguttula, Aphids, Cotton, Lady bird beetle, Leafhopper, Thrips, Weather parameters, Whitelfy. Top |