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STUDIES ON THE VARIETAL PREFERENCE, BIOLOGY AND MANAGEMENT OF THE GROUNDNUT BRUCHID Caryedon serratus (Olivier)

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Title STUDIES ON THE VARIETAL PREFERENCE, BIOLOGY AND MANAGEMENT OF THE GROUNDNUT BRUCHID Caryedon serratus (Olivier)
 
Creator HASANSAB.A.NADAF
 
Contributor KOTESWARA RAO, S.R
 
Subject PREFERENCE, BIOLOGY, MANAGEMENT, GROUNDNUT, BRUCHID, Caryedon, serratus
 
Description Studies on the varietal preference, biology and management of groundnut bruchid,
Caryedon serratus (Olivier) were conducted in the Department of Entomology, College of
Agriculture, Rajendranagar during November, 2007 to June, 2008.
The preference of different groundnut varieties by C.serratus was tested based on
fecundity, number of adults emerged, mean development period, index of susceptibility, index of
suitability, growth index, per cent survival of C. serratus and per cent weight loss of pods. The
test varieties were grouped into three categories as least susceptible, moderately susceptible and
highly susceptible based on mean and S.D. values. The physical characters like thickness of the
shell, interpod space and interkernel space were determined in pods and kernels of groundnut
variety and correlation were worked out with the above parameters. The varieties TPT-25 and
OG-52-1 recorded minimum fecundity, less adult emergence, more mean development period,
low index of susceptibility, low index of suitability, low growth index, less per cent survival and
minimum weight loss. These were categorised as least susceptible varieties.
Studies on the biology of C.serratus at ambient conditions, 30oC+RH 50%, 30oC+RH
80% and 30oC+RH 90% revealed that the average egg period 6.3, 10.42, 5.48 and 7.12 days, the
grub period 21.08, 23.08, 20.72 and 19.18 days and the pupal period 9.22, 13.66, 9.4 and 9.66
days at ambient conditions, RH 50%, 80% and 90% at temperature 30oC, respectively. The
average longevity of adult male was 12.78, 20.98, 14.58 and 13.18days and adult female was
17.94, 25.44, 17.34 and 15.52 days at ambient conditions, RH 50%, 80% and 90% at temperature
30oC, respectively.
Studies on relative efficacy of grain protectants against C.serratus indicated that the
treatment of groundnut pods with sweet flag rhizome powder (10 g) was found to be effective
in disrupting the bruchid development by recording pods with no eggs, no pod damage and no
adult emergence for the first two months. The pods treated with neem seed kernel powder (10
g) protected the pods effectively against C. serratus damage for the first two months by
recording 1.69 and 2.06% pod damage when compared with the control, wherein 14.11 and
17.79% pods damage was noticed during first and second month, respectively. Spinosad and
deltamethrin proved their merit throughout experimental period by achieving zero per cent
pods with egg, pod damage for first two months and adult emergence for first three months.
Even though, sweet flag rhizome powder (10 g) and deltamethrin (0.02 g) continued to be
effective for the first two months by recording zero per cent pods with eggs, pod damage and
adult emergence, in the latter months these treatments were less effective than deltamethrin
(0.04 g) and both the concentrations of spinosad. Therefore, spinosad (0.5 and 1.0 ml) and
deltamethrin (0.04 g) can be recommended for use as pre storage grain protectants.
 
Date 2016-08-05T10:46:31Z
2016-08-05T10:46:31Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/71012
 
Language en
 
Relation D8285;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD