Indian Journal of Entomology

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Nine genotypes of garlic were evaluated for their reaction to Thrips tabaci Lindeman under natural infestation and for host plant traits. Amongst genotypes, UHF G12-2 exhibited resistant reaction; G-282 and PGS-204 were found to be moderately resistant and G- 384, G-189, Bhima purple, PGVK-07 and G-304 were susceptible. The relationship between infestation and among leaf angle (r = -0.897**) and total phenol content (r= -0.836**) showed a significant negative correlation. Leaf damage revealed a weak negative correlation with leaf angle (r= -0.483) and total phenol content (r= -0.303). The plant height and number of leaves revealed a significant negative correlation with thrips damage (r= -0.796*) and nonsignificant negative one with thrips density. Total chlorophyll content showed a non-significant negative correlation with thrips density (r= -0.278) and damage (r= -0.597). Thus, the garlic cultivar UHF G 12-2 could be a promising genotype with resistance/ tolerance, having higher phenol content, total chlorophyll and bulb yield.

Keywords

Thrips tabaci, Allium sativum, Varietal Resistance, Biochemical Resistance, Biophysical Traits, Antixenosis, Antibiosis, Tolerance, Susceptible, Phenol, Chlorophyll, Bulb Yield.
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