Varietals variability of winter rapes (Brassica napus L.) for their susceptibility to green aphid, Myzus persicae Sulzer) (Homoptera: Aphididae)
2015
Sarwar, M. (Nuclear Inst. of Agriculture, Tandojam (Pakistan)) | Sattar, M. (Nuclear Inst. of Agriculture, Tandojam (Pakistan))
The green aphid, Myzus persicae (Sulzer), is an important and serious insect pest of oilseed crops, therefore, field experiments were conducted to determine the resistance of 30 rape genotypes (Brassica napus L.) against this pest grown during 2 consecutive crop seasons. The pest tolerance of rape genotypes was assessed by quantitative traits such as number of aphids on each infested genotype and mean dry weight of seeds per genotype. Studies on the susceptibility of various trailed rape genotypes to the pest invasion, showed the differences in overall rates of aphids development and seed yield. Among the entire rape genotypes tested, W-97-0.75/11 and Hyola-42 were comparatively resistant to aphids pest, and showed low attack and increased seeds yield. The most pest population accommodating and yield suffering genotypes were Can-5-4 and Abasin-10. Experiments showed a marked mode of damage inflicted by aphids on rape B. napus plants tested, and the pest incidence was least on early sown crop compared to late sown that can be an effective management decision to reduce the risk of damage. With the availability of this information on host plant resistance and pest damage, the future strategies could be focused on the creation of virtual immunity in winter rapes against pests for development of new high yielding varieties.
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