Aphids are herbivores that feed on plant’s sap and are widespread throughout the globe. To assess the factors affecting the infestation of Aphis gossypii (Glover) and to use antixenosis a trial was conducted using 5 okra genotypes (Sabz Pari, Advanta, Durga, Kaveri, and Shandar) during spring, 2017 at “Agriculture Research Institute” (ARI) Tarnab, under Random Complete Block Design (RCBD) in field and Completely Randomized Design (CRD) in lab with 3 and 8 replications, respectively. Weekly data gathering for mean percent infestation of A. gossypii on each genotype to note variation among genotypes. The aphid infestations (2.5 Aphid leaf-1) recorded on Shandar was higher than others and lowest (2.0 Aphids leaf-1) was recorded on Durga. Initially the infestation was lesser (0.5) but with time it reaches to peak (3.62) on 1st May and then gradually declined to least (2.0 aphid leaf-1) in the 10th week. A statistically significant negative relationship existed between aphid abundance and crop yield. In the antixenosis trial, the Durga variety showed significant antixenosis resistance towards aphids after 12, 24, and 48 hours. Furthermore, the maximum yield of Durga variety (8.3 Tons (t)/ha) and the least yield (5.2 tons/ha) Shandar was obtained. Relating to aphid infestation and yield, the Durga variety performed exceptionally well. It is concluded from the results that the varieties showing antixenosis resistance towards insects must be recommended to not only reduce insect attacks but also to enhance yield.
Received: Oct 03, 2022; Accepted: Dec 12, 2022; Published: Dec 31, 2022
Raza, M. M.,
& Muhammad, F.
Factors Responsible for Resistance in Okra against Aphid, Aphis Gossiypii Glover (Homoptera: Aphididae),
Journal of Bioresource Management, 9