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Volume 4, Issue 1      January-March, 2016

EFFECT OF DIFFERENT BRASSICA VEGETABLES ON BIOLOGY AND DEMOGRAPHIC PARAMETERS OF BREVICORYNE BRASSICAE (HOMOPTERA: APHIDIDAE) UNDER LABORATORY CONDITIONS
 

Muhammad Asif Aziz1, Muhammad Irfan1, Imran Bodlah1 and Muhammad Hanif2

1Department of Entomology, 2Department of  Mathematics and Statistics

Pir Mehr Ali Shah, Arid Agriculture University, Rawalpindi 

ABSTRACT 

Biological and demographic parameters of cabbage aphid, Brevicoryne brassicae (L.) were studied on four different Brassica hosts; Cabbage, Broccoli, China cabbage, and Knol khol under laboratory conditions. Age-stage, two-sex life table studies showed significantly higher intrinsic rate of increase (rm) and finite rate of increase (λ)  on China cabbage followed by Broccoli and Cabbage. Performance of cabbage aphids remained comparatively low on Knol khol in terms of intrinsic rate of increase (rm), finite rate of increase (λ) and net reproductive rate. Total duration of immature stages was significantly longer on Knol khol than Cabbage and China cabbage, however, adult pre-reproductive period showed non-significant variation. Reproductive period, adult longevity and female fecundity upon all the studied plant species were significantly different. The minimum fecundity and adult longevity were observed on Knol khol. The probability of surviving nymph to adult female was 0.25, 0.35, 0.50 and 0.60 on Cabbage, Knol khol, Broccoli and China cabbage, respectively. The gross reproductive rate, life expectancy and age stage reproductive values were also minimal on Knol khol. On the basis of present life table studies, China cabbage remained the most susceptible host followed by both Broccoli and Cabbage while Knol khol proved to be the most unsuitable host. Present studies confirm Knol khol as comparatively more resistant against cabbage aphid and suitable to be cultivated as important vegetable crop in Pothwar region of Punjab.

Keywords: Brevicoryne brassicae, Brassica, life table, development, fecundity, age-stage two-sex

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