BIOLOGY, VARIETAL SCREENING AND MANAGEMENT OF Rhyzopertha dominica (Fabricius) ON STORED SORGHUM

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dc.contributor.advisorRADADIA, G.G.
dc.contributor.authorMeena, Manisha
dc.date.accessioned2017-01-18T10:01:10Z
dc.date.available2017-01-18T10:01:10Z
dc.date.issued2013-09
dc.description.abstractInvestigations were carried out at Department of Agricultural Entomology, N. M. College of Agriculture, NAU, Navsari during 2012-13 on “biology, screening of varieties of sorghum for their susceptibility and evaluation of botanical powders as grain protectants against Rhyzopertha dominica (Fabricius) in stored sorghum”. The freshly laid eggs were white, translucent, typically round at one end and pointed at another end and turn into light red colour which was indication of advancing incubation period. The average length and breadth of eggs were measured 0.39 ± 0.04 and 0.19 ± 0.02 mm, respectively. The hatching percentage was recorded as 80.28 ± 6.64 per cent. The average incubation period was recorded 7.17 ± 1.04 days on sorghum (variety GJ-42). The newly hatched larva was white in colour with brownish head. The average total larval and pupal period was recorded as 35.29 ± 2.06 days. Average total developmental period for male and female was 42.64 ± 1.90 and 42.42 ± 1.92 days, respectively. The average length and breadth of male measured 2.35 ± 0.08 and 0.79 ± 0.05 while it was 2.53 ± 0.24 and 0.80 ± 0.05 mm, respectively for female. Thus female was slightly longer than male. The sex ratio of male to female was observed 1: 1.31 under laboratory condition. The pre-oviposition, oviposition and post- oviposition periods were recorded 6.33 ± 1.11, 36.38 ± 2.30 and 7.67 ± 1.02 days, respectively. Average fecundity of R. dominica was found 244.38 ± 16.84 eggs per female under laboratory condition. The average longevity of male was 47.89 ± 2.23 and it was 50.38 ± 1.95 days for female. The female lived longer than male. The lesser grain borer, R. dominica completed eight overlapping generations in a year on sorghum grains (variety GJ- 42) at Navsari. The temperature and relative humidity increased, the developmental period of R. dominica was significantly decreased and vice-versa. Eight varieties of sorghum were tested for their resistance and susceptibility to R. dominica under laboratory condition. None of the variety observed to be completely immune against attack of R. dominica. Based on different biological parameters the varieties GJ-35, GJ-36 and CSV 21 F proved as tolerant against R. dominica. The varieties GJ-42 and GSF-5 considered as more susceptible based on developmental preference, survival percentage, oviposition period, fecundity, susceptibility index and growth index. Based on per cent adult mortality of R. dominica, black pepper seed powder 0.5 per cent was found effective at different storage periods of sorghum and recorded 29.75 per cent overall mean mortality of adults. The treatments red chilli fruit powder and neem seed kernel powder both at 5.0 per cent were next equally effective treatments. Neem leaf powder, turmeric rhizome powder and tulsi leaf powder were poor in their efficacy against R. dominica. On the basis of eggs laying, adult emergence, per cent reduction in progeny, percentage seed damage and weight loss, neem seed kernel powder 5.0 per cent was proved effective treatment for protecting the sorghum grains against the infestation of R. dominica. The next effective treatment was black pepper seed powder 0.5 per cent, while neem leaf powder, turmeric rhizome powder and tulsi leaf powder were poor in checking R. dominica population in stored sorghum. The effect of various botanical powders on germination of sorghum was evaluated under laboratory condition at 60 days after treatment and it is concluded that neem leaf powder, tulsi leaf powder, turmeric rhizome powder and control (untreated) maintained more than 80 per cent germination. Red chilli fruit powder, black pepper seed powder and neem seed kernel powder were adversely affected the germination of stored sorghum grain.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/96671
dc.language.isoenen_US
dc.publisherAGRICULTURAL ENTOMOLOGY DEPT., N.M. COLLEGE OF AGRICULTURE, NAVSARI AGRICULTURAL UNIVERSITY NAVSARIen_US
dc.subAgricultural Entomologyen_US
dc.these.typeM.Sc
dc.titleBIOLOGY, VARIETAL SCREENING AND MANAGEMENT OF Rhyzopertha dominica (Fabricius) ON STORED SORGHUMen_US
dc.typeThesisen_US
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