TOXICOLOGICAL STUDIES OF SWEET FLAG RHIZOME (Acorus calamus L.) ON Callasobruchus analis L. AND Sitophilus oryzae L.
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2014-07-30
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Abstract
Investigations on the LC50 values of sweet flag rhizome, evaluation of sweet flag rhizome formulation with different carriers against Callasobruchus analis L. on pigeonpea and Sitophilus oryzae on sorghum in storage condition, mode of action of sweet flag rhizome, persistence study and effect of packaging materials and sweet flag rhizome treatment against C. analis and S. oryzae was undertaken at the Department of Agricultural Entomology, college of Agriculture, Raichur, Karnataka during 2012-14.
In the bioassay studies, LC50 values for adults of C. analis and S. oryzae was 21600, 22200 ppm and 18600 and 18700 ppm respectively for an exposure period of 24 hrs. In the evaluation of different carriers, sweet flag rhizome powder at two per cent with talc as carrier was found to be effective in restricting the oviposition, seed damage, weight loss and population buildup up to 120 days after storage in the laboratory condition. Sweet flag rhizome showed contact, fumigant and repellent action on C. analis and S. oryzae. The rate of response increased with increase in dose level and exposure period. It has the capacity to protect the seeds against C. analis and S. oryzae up to 10 months and 8 months respectively by preventing egg laying, population buildup, seed damage. Among the malathion and sweet flag rhizome evaluated impregnation treatment of cloth bag, gunny bag, mud container, polythene cover, glass and steel container, in which pigeon pea was stored for their efficacy, malathion was found to be most effective followed by sweet flag rhizome by recording minimum seed damage and adult survival. These two were superior over the untreated control. Seeds stored in cloth bag were worst affected compared to seeds stored in polythene cover, steel and glass containers which were found to be least affected.
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