Seasonal abundance of major insect pests and Integrated Pest Management of brinjal shoot and fruit borer, Leucinodes orbonalis Guenee
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Date
2021-07-29
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ANDUAT, Kumarganj, Ayodhya
Abstract
The present investigation entitled “Seasonal abundance of major insect pests and Integrated Pest Management of brinjal shoot and fruit borer, Leucinodes orbonalis Guenee” has been proposed to be carried out at Students’ instructional Form of A.N.D.U.A. & T., Kumarganj, Ayodhya (U.P.) d Kharif season, 2019 and 2020. The maximum and minimum shoot infestation 31.85 and1.32 per cent was observed during 43rd SW and 35th SW of Kharif season, 2019, respectively. The maximum and minimum shoot infestation 36.84 and 0.80 per cent was recorded during 43rd SW and 35th SW Kharif season, 2020, respectively. The maximum and minimum fruit infestation 34.26 and 2.35 per cent was recorded during 46th SW and 39th SW Kharif season, 2019, respectively. The maximum and minimum fruit infestation 38.24 and 2.12 per cent was observed during 46th SW and 39th SW Kharif 2020 respectively.
Spider highest mean population 3.42 spider/plant was noticed at fruiting stage followed by flowering stage (1.73 spider/plant), vegetative stage (1.12 spider/plant) and seedling stage (1.01 spider/plant) respectively, during Kharif 2019 and Kharif 2020. Ladybird beetle highest pooled mean population 4.99 beetles/plant was observed at fruiting stage followed by flowering stage (4.73 beetles/plant), vegetative stage (3.32 beetles/plant and seedling stage (1.75 beetles/plant) respectively, during Kharif 2019 and Kharif 2020.Shoot infestation per cent revealed a highly significant negative correlation with the minimum temperature (r= -0.465 and -0.951), non-significant negative correlation with maximum temperature (r= -0.044 and -0.281), during Kharif 2019 and 2020, non-significant negative correlation with relative humidity (r= -0.147) and (r= -0.139) and rainfall (r= 0.322) and (r= 0.254) showed non-significant with positive correlation during Kharif season, 2019 & Kharif season, 2020.
Average duration of L. orbonalis from egg to adult emergence on brinjal during 2019 and 2020 at 30 ºC and 60% RH in case of male was ranged 21-27 and 21-27 days with a mean of 24.15 ±0.828 and 25.70 ± 0.613 days respectively. Average duration of L. orbonalis also showed that the total life cycle during 2019 and 2020 at 30 ºC and 60% RH in case of female was ranged 23-31 and 23-31 days with a mean of 26.68 ±0.914 and 27.77± 0.283 days respectively.
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