Vol. 11, Special Issue 10 (2022)

Author(s):
Dilip Makwana and Mitul Karkar

Abstract:
The investigation was carried out on Study of yield losses and Correlation between population of major sucking pests with weather in Bt cotton during Kharif 2011-2012 at instructional farm, JAU, Junagadh. The data revealed that significantly higher seed cotton yield 2038.82 kg/ha was recorded from protected plots, while the yield of 1312.70 kg/ha was recorded from unprotected plots. The yield increased in protected plots over unprotected plots was 726.12 kg/ha. The result clearly indicated that by providing protection with effective pesticides against cotton sucking pests, 726.12 kg/ha yield loss can be saved. The infestation of aphid on cotton commenced during the 3^rd week of September and reached at a peak during the 2^nd week of December. Jassid population had highly significant positive correlation with maximum temperature, morning relative humidity and afternoon relative humidity, while non-significant negative correlation occurred with minimum temperature, rainy days. The incidence of thrips on cotton was found to be active from 2^nd week of August to 4^th week of January. The incidence of whitefly on cotton commenced during the 2^nd week of August and reached at a peak level in 1^st week of November. Mealy bug population had highly significant positive correlation with maximum temperature and non-significantly positive correlation with minimum temperature, morning relative humidity and afternoon relative humidity.