ABSTRACT
The present study was conducted to assess the incidence of defoliator pests of groundnut in three different staggered sowings. The experiment was laid with three treatments and seven replications which was carried out at RARS (Regional Agricultural Research Station), Palem, Nagarkurnool district, Telangana state which is having hot and dry climate. The data has been correlated with various weather parameters, including Maximum temperature, Maximum temperature, RH-I and RH-II. The variety K-6 was grown in three staggered sowings (D1: 1st Oct; D2: 15th Oct; D3: 1st Nov). There was a less population of leaf miner during D1 the correlation studies revealed that tobacco caterpillar showed a non-significant negative correlation with the Tmax ºC (r= -0.233) and a significant positive correlation with Tmin ºC (r= 0.370) and RH-? (r=0.640). whereas gram caterpillar showed a positive significant correlation to Tmax (r= 0.256) and Tmin (r= 0.097) and a negative significant correlation towards RH-? (r= -0.186) and RH-? (r= -0.501).
ABSTRACT
The experiment on population dynamics against leafhopper and thrips of castor,a field experiment was conducted during 2021 & 2022 on castor (Ricinus communis) at Regional Agricultural Research Station Palem, PJTSAU. The studies on population dynamics of leafhopper (Empoasca flavescens) revealed thatthe activity of leafhoppers was moderate to heavy with maximum of 120.8 leafhoppers/3 leaves/plant was recorded during the second fortnight of December (52 SMW, 24th-31st Dec). Leafhopper population had non-significant and negative correlation with maximum temperature (r = -0.24 and r = -0.29, respectively), whereas it had significant assocation and negative correlation with minimum temperature, morning relative humidity, evening relative humidity as well as rainfall (r = - 0.64 - 0.50, r=-0.61 and - 0.52, respectively). Thrips infestationwas observed from October first fortnight (40 SMW 1st Oct -7th Oct) to December second fortnight (52 SMW, 24th-31st Dec) with peak infestation 31.1 thrips/spike.Thrips population had non-significant and negative correlation with maximum temperature ( r = -0.29), whereas it had significant assocation and negative correlation with minimum temperature, morning relative humidity, evening relative humidity as well as rainfall (r = - 0.68, r= -0.55, r=-0.63 and, r=- 0.49 respectively). Leafhopper and thrips has significant association and positive correlation with sunshine hours (r=0.55 & r=0.51).