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Relative efficacy of certain new molecules and botanicals as seed protectant on storability of green gram and black gram against pulse beetle, Callosobruchus chinensis L.

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Title Relative efficacy of certain new molecules and botanicals as seed protectant on storability of green gram and black gram against pulse beetle, Callosobruchus chinensis L.
 
Creator MISHRA, NAMASHYA
 
Contributor Dash, D
 
Subject insecticidal and botanical treatment, seed infestation, begunia, naguari, curry leaf powder, citronella oil, sweet flag formulation
 
Description Studies were conducted in the Seed Entomology Laboratory of Department of Seed
Science and Technology during 2014-15 to evaluate the efficacy of few insecticide molecules
and botanicals as their seed treatment in green gram and black gram against pulse beetle,
Callosobruchus chinensis (L.) infestation under ambient storage condition. The insecticidal
and botanical experiments were laid out in CRD with 6 treatments including untreated control
and replicated four times . Test insecticides molecules comprised Emamectin benzoate 5 SG
@ 2ppm, Spinosad 45 SC @ 2ppm, Profenofos 50 EC @ 2ppm, Novaluron 10 EC @ 5ppm
and Deltamethrin 2.8 EC @ 1ppm. Different plant materials like begunia, naguari, curry leaf
powder@ 10g/kg seed, citronella oil @ 10 ml and sweet flag formulation 6 EC @ 10 ml/ kg
seed were taken as test botanicals for study.
Studies on bruchid mortality indicate no mortality in untreated control as against
45.0 to 77.5% and 45.0 to 75.0% mortality due to insecticidal and botanical treatments
respectively following 7 days exposure period after 6 months of seed treatment irrespective of
pulses. The seed treatment with deltamethrin (7.25 eggs) and emamectin benzoate (8.75 eggs)
recorded minimum fecundity of pulse seeds in green gram and black gram respectively.
Among botanicals significantly lowest oviposition was noticed in sweet flag formulation
both in green gram (8.0 eggs) and black gram (8.5 eggs) after 6 months of storage.
The population build-up of adult bruchids(F1progeny)was significantly minimum in
emamectin benzoate (7.0- 8.25 adults) followed by deltamethrin (8.25- 9.75 adults) as against
maximum in untreated control (75.50- 84.50 adults) regarded of pulses, after 6 months of seed
treatment. On the contrary, the seed treatment with sweet flag formulation registered lowest
adult emergence in green gram (2.75- 7.25 adults) and black gram (1.75-6.25 adults) through
out the period of investigation.
Highest reduction of seed damage on control was estimated in emamectin benzoate
(90.70%) and spinosad (88.00%) in green gram and black gram, respectively. Among plant
products, the percentage reduction of seed infestation over control after 6 months of storage
was recorded maximum in sweet flag formulation (82.69) in green gram and begunia leaf
powder (86.96) in black gram.
Emamectin benzoate was found best and expressed highest germination count (85.50
-86.75 %) among insecticides in both the treated pulse seeds exposed to bruchid attack after 6
months of storage period. Treatment with sweet flag formulation contributed a maximum of
22.39 and 19.72 per cent increase in germination potential of green and black gram seeds
respectively.

The weight loss and protein content of infested green gram seeds was
calculated least in emamectin benzoate (0.22 and 13.44 %) followed by deltamethrin (0.24
and 13.75 %). In black gram, it was analysed minimum in emamectin benzoate (0.33 % and
12.96 % followed by spinosad (0.39 % and 13.90 %). Among botanicals,sweet flag
formulation showed lowest weight loss and protein composition in green gram (0.38 % and
13.96 %) and black gram (0.35 and 13.25 %) due to minimum seed damage by bruchids.
Thus it can be concluded that new molecules i.e., emamectin benzoate, spinosad and
botanicals i.e., sweet flag formulation, begunia leaf powder and citronella oil were found most
effective seed protectants in pulses over others and have great potentiality in suppressing the
seed infestation by the bruchid to a minimum level with appreciably no adverse effect on
seed viability up to 6 months of storage.
 
Date 2017-01-20T13:30:30Z
2017-01-20T13:30:30Z
2015
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/97366
 
Language en
 
Relation Th;4394
 
Format application/pdf