Vol. 11, Special Issue 8 (2022)

Author(s):
AT Raval and AH Barad

Abstract:
An experiment was conducted under field conditions at Anand Agricultural University, Anand during Rabi, 2020-21 to study the effect of different weather parameters on occurrence and abundance of mustard aphid infesting radish. The incidence of aphids on radish crop was observed from December, 2020 to January, 2021. The incidence was initiated during the second week of December (49^th SMW) in Rabi, 2020. Initially, its population was low (8.2 aphids per 3 leaves), which was gradually increased in its numbers and attained peak level (71.6 aphids per 3 leaves) during second week of January (2^nd SMW). Then after, population was gradually decreased toward the maturity of the crop. Aphid population showed positive correlation with morning relative humidity, evening relative humidity and wind speed. It showed significantly negative correlation with the maximum temperature. Whereas, negative correlation with minimum temperature, morning vapour pressure, evening vapour pressure and bright sunshine hours.