Lucerne aphid

Investigations on population dynamics of lucerne aphid were carried out under field condition during 2018-19 at Instructional Farm, Junagadh Agricultural University, Junagadh. The activity of aphid, Aphis craccivora was commenced from 2nd week of February and remained upto 3rd week of March having peak during 4th week of February in lucerne crop. Simultaneously, higher population of lady bird beetles was observed during 4th week of January to 3rd week of March and showed significantly highly positive correlation with aphid population.

5p trinhthamhodang11 27-04-2021 12 1   Download

Studies on predatory potential of larva and adult of H. octomaculata on A. pisum was carried out under laboratory conditions during January 2018 to April 2018.The results showed that the first, second, third and fourth instar larva consumed an average of 15.72 ± 2.66, 25.72 ± 4.79, 53.58 ± 10.93 and 88.94 ± 14.79 aphids, respectively. The total larval consumption was 183.96 ± 17.97 aphids during its total developmental period when reared on A. pisum. The mean daily consumption of first, second, third and fourth instar larva was 12.09 ± 3.03, 14.11 ± 3.36, 21.61 ± 5.60 and 25.38 ± 4.

7p caygaocaolon3 27-02-2020 17 0   Download