FIELD SCREENING OF CERTAIN GENOTYPES AGAINST MAJOR PESTS OF BLACKGRAM AND THEIR MANAGEMENT WITH INDIGENOUS PRODUCTS AND NEWER INSECTICIDES P. PRASHANTHI B.Sc.

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dc.contributor.advisorCHIRANJEEVI, Ch.
dc.contributor.authorPRASHANTHI, P
dc.date.accessioned2020-02-05T10:49:28Z
dc.date.available2020-02-05T10:49:28Z
dc.date.issued2018
dc.descriptionD5762en_US
dc.description.abstractThe present investigation on “Field screening of certain genotypes against major pests of blackgram and their management with indigenous products and newer insecticides” was carried out in the Agricultural College Farm, Bapatla during kharif and rabi, 2017-18 with an aim to identify the resistant blackgram genotypes against major insect pests and to know the efficacy of indigenous products and newer insecticides against insect pests and influence on natural enemies. Twenty five blackgram genotypes were assessed for the incidence of insect pests viz., whiteflies, thrips and spotted pod borer and correlated with morphological and bio chemical characters of the genotypes in both the kharif and rabi 2017-18. The genotypes, KU-17-114 and KU-17-130 recorded minimum population of whiteflies (1.59 and 3.70 per plant respectively), thrips (1.10 and 0.86 per plant respectively) and minimum per cent pod damage by spotted pod borer (8.72% and 10.69% pod damage/ plant respectively) and hence grouped as low preferred blackgram genotypes for these insect pests. The blackgram genotype, KU-17-114 having low preference for the insect pests has recorded higher trichome density (43.33 trichomes/ cm2), higher amount of total phenol content (12.34 and 10.35 mg, during vegetative and reproductive stages, respectively) and lesser quantity of total sugars (33.86 and 26.24 mg, during vegetative and reproductive stages, respectively) whereas, the highly preferred genotypes, KU-17-111 and KU-17-116 have recorded less trichome density (12.59 and 11.48), low phenol content (6.13 and 10.91 at vegetative stage, 5.72 and 8.43 at reproductive stage) and high amount of total sugars (66.56 and 54.85 at vegetative stage, 42.63 and 39.87 at reproductive stage) respectively. xv The pest infestation was significantly and negatively correlated with trichome density and total phenol content whereas, positively correlated with total sugars. Management studies, with indigenous products and newer insecticides revealed that spinosad 45 SC @ 0.3 ml/L was significantly superior in reducing the whiteflies (55.74% during kharif and 59.87% during rabi, 2017-18) and thrips (58.49% during kharif and 62.73% during rabi, 2017-18) population followed by diafenthiuron 25 WP @ 1.25 g/ L and emamectin benzoate 5 SG @ 0.5 g/ L with high per cent reduction in population over control, during both kharif and rabi 2017-18. Among the indigenous products tested, NSKE 5% recorded the highest per cent reduction of whitefly population (23.15% during kharif and 25.08% during rabi, 2017-18) and thrips (30.36% during kharif and 32.54% during rabi, 2017-18) population. Flubendiamide 39.35 SC @ 0.3 ml/ L (77.65% and 68.15%) and spinosad 45 SC @ 0.3 ml/ L (73.35% and 68.05%) were effective in the reduction of mean larval population of spotted pod borer during kharif and rabi, 2017-18 respectively. Among the indigenous products, NSKE 5% (51.86% during kharif and 49.72% during rabi, 2017-18) recorded highest per cent reduction in larval population. Panchagavya 3% was found least effective against whiteflies (20.87% and 22.11 % reduction), thrips (21.78% and 25.43 % reduction) and spotted pod borer (42.69% and 42.45% reduction over control) during both kharif and rabi, 2017-18 respectively. There was no significant influence of indigenous products and newer insecticides on coccinellids during both the seasons. The seed yield of blackgram was highest in the treatment spinosad 45 SC @ 0.3 ml/ L (1334.58 kg ha-1) followed by emamectin benzoate 5 SG @ 0.5 g/ L (1198.19 kg ha-1). Spinosad 45 SC @ 0.3 ml/ L recorded the highest incremental cost benefit ratio (2.72) over the other treatments. However, all the treatments were found significantly superior over the untreated control both in terms of pests suppression and seed yield in blackgram.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810142553
dc.keywordsFIELD SCREENING, BLACKGRAM, INDIGENOUS, INSECTICIDESen_US
dc.language.isoen_USen_US
dc.pages153en_US
dc.publisherAcharya N.G. Ranga Agricultural Universityen_US
dc.research.problemFIELD SCREENING OF CERTAIN GENOTYPES AGAINST MAJOR PESTS OF BLACKGRAM AND THEIR MANAGEMENT WITH INDIGENOUS PRODUCTS AND NEWER INSECTICIDES P. PRASHANTHI B.Sc.en_US
dc.subEntomologyen_US
dc.subjectnullen_US
dc.themeFIELD SCREENING OF CERTAIN GENOTYPES AGAINST MAJOR PESTS OF BLACKGRAM AND THEIR MANAGEMENT WITH INDIGENOUS PRODUCTS AND NEWER INSECTICIDES P. PRASHANTHI B.Sc.en_US
dc.these.typeM.Scen_US
dc.titleFIELD SCREENING OF CERTAIN GENOTYPES AGAINST MAJOR PESTS OF BLACKGRAM AND THEIR MANAGEMENT WITH INDIGENOUS PRODUCTS AND NEWER INSECTICIDES P. PRASHANTHI B.Sc.en_US
dc.typeThesisen_US
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