Abstract
A study was conducted to identify a resistance source against sesame leaf webber and capsule borer,Antigastra catalaunalis (Dup.) among 43 sesame genotypes under field and laboratory conditions. The reaction of genotypes was categorized using 0 to 9 scoring methodology. The genotypes KMR 14 and TKG 22 were found as moderately resistant with the score of 3 and grade 5 while SI 250, ES 22 and UMA were rated to be resistant with the score 1.6 and grade 3. Among 23 genotypes tested for biophysical (non-preference) and biochemical basis (antibiosis) of resistance three genotypes viz., ES 22, UMA, SI 250 and KMR 14 were identified as less preferred for oviposition with the lowest number of eggs laid on UMA. The egg laying of A. catalaunalis was positively correlated with the trichome density on the leaf. The low growth index of A. catalaunalis in the resistant genotypes ES 22, SI 250 and UMA indicates the presence of antibiosis mechanism in the genotypes. Hence, these genotypes could be used as resistant source in hybridization programmes for transferring leaf webber and capsule borer resistance. Key words: Sesame genotypes, screening, non-preference, antibiosis, Antigastra catalaunalis.
Highlights
Sesame (Sesamum indicum Linn.) from familyPedaliaceae, is an old and important oilseed crop being cultivated in tropics, subtropical region of India and other parts of world
The infestation of A. catalaunalis was observed from early vegetative phase to pod maturation phase and none of the genotypes were free from attack by the leaf webber and capsule borer
Singh (2002) reports that the ovipositional preference of A. catalaunalis was nil on the genotype
Summary
Sesame (Sesamum indicum Linn.) from familyPedaliaceae, is an old and important oilseed crop being cultivated in tropics, subtropical region of India and other parts of world. The present study aimed at identifying the probable source of resistance to A. catalaunalis in diverse sesame genotypes. Nehru College of Agriculture and Research Institute, Karaikal, Puducherry, India to study their susceptibility and resistance level against the leaf webber and capsule borer A. catalaunalis.
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