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Evaluation of Diatomaceous earth against Sitophilus oryzae (L.) and Callosobruchus chinensis (L.)

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Title Evaluation of Diatomaceous earth against Sitophilus oryzae (L.) and Callosobruchus chinensis (L.)
 
Creator Poornima Matti
 
Contributor J.S.Awakanavar
 
Subject Agricultural Entamology
 
Description Investigation on effect of formulated diatomaceous earth (DE) protect-it from USA (DE is the
fossilized remains of diatoms) for the control of storage insects was carried out for the first time
in India in the Department of Entomology, University of Agricultural Sciences, Dharwad,
Karnataka Admixture of DE at various concentrations with grains (0.025, 0.05, 0.1, 0.15, 0.2,
0.25 and 0.3%) under laboratory conditions on the rice weevil Sitophilus oryzae (L.) and
bruchid, Callosobruchus chinesis (L.) showed 100% mortality of adults at concentration of 0.1%
and above.
Investigations carried out on the effect of temperature (20, 25, 30 and 350C) and humidity
(30, 50, 70 and 90%) at each temperature. The effectiveness of DE admixed at 0.1% showed
increased mortality with increasing temperature and decreasing humidity, 100% mortality was
observed in all four RHs tried with 350C and only in lower RHs with 300C combinations and at
lower temperature 200 only at the lowest RH (30%) combinations. Drastic reduction of moisture
content (6.8-8.2%) in DE treated grains at different temperature and humidity was noticed and
higher seed germination (>90%) was also observed in DE treated grains for both the insects. Less
number of eggs and less adult emergence were recorded at highest temperature with lower RH
(30 and 50%) in C. Chinesis.
DE @ 0.1% and above concentration recorded higher seed germination (>89%), no seed
damage and reduction in moisture content (9.0-10.5%) in both the insects. Effect of DE on
reproductive performance of pulse beetle revealed that less number of eggs and less adult
emergence was recorded in DE @ 0.1% and above.
Sand (20%) and ash (30%) alone were found effective by recording highest adult
mortality while sweet flag rhizome powder alone at 0.5% proved to be effective recording 100%
mortality, whereas neem cake has no effect on adult mortality.
 
Date 2016-09-14T10:35:49Z
2016-09-14T10:35:49Z
2006
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/76581
 
Format application/pdf
 
Publisher UAS, Dharwad