Evaluation of okra genotypes for resistance to shoot and fruit borer earias vittella (Fabricius)

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dc.contributor.advisorRam Singh
dc.contributor.authorSultani, Mahbob Shah
dc.date.accessioned2016-11-18T14:45:15Z
dc.date.available2016-11-18T14:45:15Z
dc.date.issued2008
dc.description.abstractThirty genotypes of okra, Abelmoschus esculentus (L.) Moench were evaluated for field resistance during 2007 to shoot and fruit borer, Earias vittella (Fabricius). On the basis of observation recorded on infestation level of fruits on number basis seven genotypes, two resistant (HB-03-29-7B and HBT-1-19-1-1-2), two moderately resistant (HB-03-14-11 and HB-03-26-1), one highly susceptible (HBT-1-18-1-C-1) and two popular varieties (Varsha Uphar and HBH-142) were selected for elaborate studies under field and laboratory conditions. The resistant genotypes showed significantly (P<0.05) less fruit infestation both on number and weight bases than the susceptible one. Number of eggs laid per fruit did not differ significantly among the genotypes, thereby, conforming no oviposition antixenosis in resistant genotypes. The impact of trichome density (r= 0.671) and length (r= 0.871) were positive and significant. Survival of larvae was less on fruit blocks (67.00-82.66%) and on whole fruits (33.01-51.66%) of resistant genotypes, viz. HBT-1-19-1-1-2 and HB-03-29-7B in comparison to that of highly susceptible genotype HBT-1-18-1-C-1 (82.66% and 51.66%), respectively.. Longer larval period (15.33 -14.66 days), pupal period (9.66 and 10.33 days), lowest pupal weight (0.07 and 0.08 mg) and lowest per cent adult emergence (93.00 - 93.33%) were observed on fruit blocks of resistant genotypes than on highly susceptible (HBT-1-18-1-C-1) (10.33 days, 8.66days, 0.11mg and 96.33%), respectively. Longer developmental periods (larval and pupal) and lower larval survival and adult emergence on resistant genotypes suggest antibiosis mechanism of resistance. The influence of trichome density and length and thickness of pericarp did not cause any significant impact on larval duration of shoot and fruit borer. There was significant adverse effect of whole fruit pericarp on larval survival, likewise, phenol (r= -0.493), phosphorous (r= -0.546) and tannin (r= -0.738) of fruits of resistant genotypes manifested adverse effect on larval survival. These compounds showed positive relationship with larval and pupal periods. Adult emergence also showed significant (P < 0.05) negative relationship with tannin (r=-0.726). The adverse effects of resistant genotypes were found on various food consumption and utilization indices of E. vittella larvae.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/86359
dc.language.isoenen_US
dc.publisherCCSHAUen_US
dc.subEntomology
dc.subjectregeneration, planting, biological phenomena, biological development, developmental stages, vegetative propagation, fruits, pigeonpeas, hybrids, genetic processesen_US
dc.these.typeM.Sc
dc.titleEvaluation of okra genotypes for resistance to shoot and fruit borer earias vittella (Fabricius)en_US
dc.typeThesisen_US
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