Vol. 10, Special Issue 7 (2021)

Author(s):
Saravana Kumar P, N Ganapathy, N Muthukrishnan, S Mohan Kumar, G Karthikeyan and R Swarna Piriya

Abstract:
Field trials were conducted at Tamil Nadu Agriculture University, Vegetable orchard to evaluate the thirty three okra genotypes against whitefly and yellow vein mosaic virus under field and glasshouse condition. The result revealed the highest mean number of whitefly was recorded on EC 359995 (11.08/plant) while the minimum mean whitefly population was observed on EC 305607 (1.83/plant) followed by EC 306703 (2.10/plant), EC 014026 (2.29/plant) and EC 305741 (2.57/plant). The result indicated that EC 305740 and EC 359995 genotypes showed the morphological traits long and broader leaf size positively correlated to whitefly population development. The result indicated that trichome density positively correlated with the whitefly population development. The genotype EC 359995 showed highest trichome density were recorded on adaxial (48.50 trichomes / cm²), abaxial (103.75 trichomes / cm²) and mid rib (60.17 trichomes / cm²). The genotype AE 65 showed minimum trichome density on adaxial (17.25 trichomes / cm²), abaxial (34.67 trichomes / cm²) and mid rib (24.62 trichomes / cm²). The genotype EC 359995, EC 306703, CO 1 and AE 65 showed high whitefly population and high yield produce tolerance effect in high yielded genotype.