M Sivarama Krishna, Dr. Y Rama Reddy and Dr. E Chandrayudu

A field trial was conducted to study the impact of weather parameters on seasonal dynamics of insect pests in Bt and non Bt cotton during the years 2018 and 2019 at Regional Agricultural Research station, Nandyal. During the year 2018 results indicated that in both the test hybrids leafhoppers crossed Economic threshold level during 39^th to 45^th standard weeks and attained peak during 40^th and 41^st standard weeks. With regard to pink bollworm population and fruiting body damage both the test hybrids attained peak during 52^nd standard week. During the year 2019 Peak population of leafhoppers were recorded during 43^rd to 46th standard weeks in both the test hybrids (6.02 to 11.8/3 leaves), with regard to fruiting body damage both the test hybrids attained peak during 51^st standard week (56 to 68%). Correlation of abiotic factors with sucking pests in cotton during the both seasons revealed that leafhopper population had shown significant positive relation with temperature maxium (0.678) whereas minimum temperature had shown positively non-significant relation (0.512), rainfall and relative humidity had shown negatively non sigficant relation with leafhopper population.

DOI: 10.22271/phyto.2020.v9.i6j.13023

Pages: 696-701  |  894 Views  397 Downloads