PJB-2024-505
EFFICACY OF DIFFERENT INSECTICIDES ON CANOLA GENOTYPES AGAINST APHID LIPAPHIS ERYSIMI Under FIELD CONDITIONS
haiderabbas
Abstract
An experiment was conducted at the New Developmental Research Farm, The University of Agriculture, Peshawar, Pakistan, to study the population trend and assess the efficacy of different insecticides on canola genotypes against Lipaphis erysimi under field conditions. Results showed that maximum mean population of 66.42 aphid plant-1 was recorded on canola genotype WY-48, while lowest mean population of aphid i-e (41.80) aphid plant-1 was recorded from Rokhana variety. Similarly, mean population of aphid showed that aphids appeared initially at1.44 aphid plant-1 during the first week of January and peaked to 173.11 aphid plant-1 during 8th week (26-February) post emergence; however, after 8th week it start declining and this trend continued for till 13th week (02-April). At the seedling stage, flowering and pod stages Bifenthrin, Neem Oil and Thiamethoxam treatments showed the highest efficacy in reducing aphid populations across most Genotypes and time intervals. Specifically, Bifenthrin treatment significantly reduced number of aphids in HC-09 Genotype at all observed time intervals (1 DAT, 3 DAT, 7 DAT and 14 DAT). Similar positive outcomes were recorded in the WY-48 Genotype. Regarding sub-branches, Bifenthrin treated Genotypes i-e HC-09, WY-48 and Rokhana showed significantly maximum sub-branches in all three canola Genotypes. Neem Oil and Thiamethoxam treatments resulted in comparatively lower sub-branch counts, with Neem Oil displaying the lowest sub-branch development among the insecticide treatments. Similarly, Bifenthrin treated HC-09, WY-48 and Rokhana yielded the highest pod counts for all Genotypes followed by Thiamethoxam. On the other hand, control group in each genotype exhibited significantly lower pod numbers for all genotypes. Data regarding Yield (kg/ha) revealed that Bifenthrin treated all genotypes (HC-09, WY-48 and Rokhana) yielding the highest quantities. Thiamethoxam treatments also led to relatively high yields, while the control group exhibited notably lower yield. Bifenthrin treatments constantly displayed positive impacts on sub-branch development, pod formation, and yield across all canola Genotypes, followed by Thiamethoxam treatments. Neem Oil treatments were ineffective in promoting sub-branch and pod development, and yield.
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