Thumbnail Image

Thesis

Browse

20171
Reset filters
Subject: Entomology × Author: Ngangom, Uma Devi × End date: 2019 × Start date: 2017 × Thesis Type: Ph.D ×
Reset filters

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    ThesisItemOpen Access
    Studies on bases of resistance in chickpea against gram pod borer Helicoverpa armigera (Hübner)
    (Punjab Agricultural University, Ludhiana, 2017) Ngangom, Uma Devi; Ravinder Singh
    Studies on bases of resistance in chickpea against gram pod borer H. armigera (Hübner) were conducted during rabi 2014-15 and 2015-16. Nine interspecific chickpea genotypes were evaluated under field and laboratory conditions. The test genotype, GLW 32 had recorded significantly lowest egg numbers 1.61 and 1.26 and larval populations 1.35 and 1.12 per five plants, lowest pod damage 8.17 and 4.49 per cent, lowest PRSR of 2 and highest grain yield of 1209.67 and 1277.00 kg/ha, during 2014-15 and 2015-16, respectively. Significantly highest larval and pupal duration and lowest survival were also observed in GLW 32 whereas, test genotypes GLW 8 and GLW 42 were on par with it during both the cropping years. Genotype GLW 32 recorded the lowest leaf damage score, lowest larval and pupal weight during 2014-15 and 2015-16 under detached leaf bioassays. Trichome density and length of non-glandular trichome on leaves showed non-significant and significant but negative correlation with number of eggs, larval population, larval weight, larval survival, per cent pod damage and PRSR. Total phenols, flavonol, o-dihydroxyphenols and tannins were found to be significantly but negatively correlated whereas, total soluble sugars was positively correlated with larval population, larval weight, per cent larval survival, per cent pod damage and PRSR. Among all the interspecific test genotypes, GLW 32 showed best performance biophysically as well as biochemically. So, we can use this genotype in breeding programe to develop resistant variety against H. armigera.