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STUDIES ON LOSS ESTIMATION AND MANAGEMENT OF Rhyzopertha dominica (Fab.) IN MAJOR CEREALS

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Title STUDIES ON LOSS ESTIMATION AND MANAGEMENT OF Rhyzopertha dominica (Fab.) IN MAJOR CEREALS
 
Creator SUDHEER KUMAR, P
 
Contributor Uma Maheswari, T.
 
Subject enzymes, productivity, bacteria, cellulose, fermentation, fungi, wood, biomass, polysaccharides, alcohols
Rhyzopertha dominica (Fab.), MAJOR CEREALS
 
Description Experiments were conducted on “Studies on loss estimation and
management of Rhyzopertha dominica (Fab.) in major cereals” during 2009-10 in the
Department of Entomology, College of Agriculture, Rajendranagar, Hyderabad. The losses
caused by R. dominica and screening in major cereals was assessed based on weight loss
(grams) weight loss (per cent), damaged seeds (per cent), viability (germination) and
population build up of the pest. Management of R. dominica in major cereals was also
studied by using various grain protectants.
The results obtained from the estimation of losses due to R. dominica indicated that
there is gradual increase in per cent weight loss with increase in storage period in all the
cereals which ranged from 0.83 to 24.67 in paddy, 1.08 to 16.22 in maize and 0.67 to 20.05
in sorghum. At 180 days after storage, the minimum per cent seed damage of 30.17 was
found in the paddy variety Sumati, 39.93 % in maize hybrid Massile and 30.27 % in
sorghum variety M 35 - 1. The paddy genotypes RNR 2465 (80.00 %) and Samba Mahsuri
(81.33 %) only have maintained the minimum germination standard of 80.00 per cent for
60 days which later reduced drastically. In maize after 30 days of storage, only the hybrids
DHM 111, DHM 117 and GK 3076 have maintained minimum germination standards of
90.00 per cent which later reduced drastically. In sorghum the genotypes SPV 462,
CSV 15 and M 35-1 have maintained the minimum germination standard of 75.00 per cent
upto 60 days which later reduced drastically. In paddy, significantly maximum population
build up of R. dominica after 180 days of storage was found in cv. Improved Samba
Mahsuri (98.00) and minimum of 88.33 in cv. RNR 2645. Significantly minimum
population build up of R. dominica after 180 days of storage was noticed in the maize
hybrid DHM 117 (56.33) and maximum in cv. GK 3076 (81.00). In sorghum, minimum
population build up of 57.00 was recorded in CSH 16 while maximum in cv. SPV 462.
Among different grain protectants used for the management of R. dominica in
paddy, maize and sorghum, minimum mortality ranging from 48.52 % to 69.52 % was
observed in paddy compared to maize ranging from 52.02 % to 71.66 % and in sorghum
ranging from 54.08 % to 77.28 %. The mortality with the grain protectants spinosad,
thiamethoxam, emamectin benzoate and deltamethrin in paddy, maize and sorghum has
shown that in paddy the mortality of R. dominica is low compared to maize and sorghum.
In paddy, after 3 and 6 days of treatment highest mortality of 41.66 % and 72.28 %
mortality was recorded with both thiamethoxam @ 0.5 g/kg seed and spinosad
@ 0.5 ml/kg seed respectively. After 9 days of treatment, maximum mortality of 96.39 %
was observed with emamectin benzoate @ 40 mg/kg seed. In case of maize, deltamethrin
@ 40 mg/ kg was highly effective after 3 days of treatment recording 47.46 % mortality
and mortality of 94.54 % was recorded after 9 days of treatment. However, after 6 days of
treatment in maize, spinosad @ 0.5 ml/kg seed had resulted in maximum of 77.98 %
mortality of R. dominica. In case of sorghum, after 3 days of treatment thiamethoxam @
0.5 g/kg had recorded a maximum mortality of 57.63 %. However, after 6 and 9 days of
treatment in sorghum, deltamethrin @ 40 mg/kg seed have resulted maximum of 82.81 %
and 98.25 % mortality of R. dominica, respectively.
 
Date 2016-06-09T11:49:04Z
2016-06-09T11:49:04Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67084
 
Language en
 
Relation ;D9282
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY