Nature Environment and Pollution Technology

B. S. Biradar ¹, S. M. Karadi ¹, Siddappa ¹, J. S. Awakannavar ², S. B. Goudappa ¹, A. Ravikumar ¹

Affiliations
1 Krishi Vigyan Kendra, Raddewadgi-585 310, Tq: Jewargi, Dist. Gulbarga, Karnataka, IN
2 College of Agriculture, Bijapur-587 103, Karnataka, IN

Abstract

The study on storage was carried out in the division of Agricultural Entomology, Agricultural Research Station, Gulbarga during the year 2012-13 to know the efficacy and persistence of various botanicals and insecticides against Sitophilus oryzae Linn. over a period of 210 days in two different methods, i.e. the application of treatments at bimonthly and monthly intervals. In bimonthly interval at 30, 90, 150 and 210 DAS, deltamethrin at 0.005 per cent stood highly effective against Sitophilus oryzae and registered the maximum mortality of 96.40, 94.59, 93.69 and 89.55 percent, followed by sweet flag (5%) with mortality of 92.25, 89.53, 90.55 and 83.25 percent respectively, differing significantly over other treatments. Similarly, in another method, i.e., in a monthly interval in which the sweet flag (5%) remained predominant with the highest mortality of 97.30 and 96.65 percent at 30 and 90 DAS, however deltamethrin (0.005%) with 95.75 and 90.25 percent at 150 and 210 DAS respectively, differing significantly over other treatments. However, in both the methods, the residual toxicity, could not sustain with the lapse of time, as a result, there was no proper monitoring of inbuilt population of S. oryzae in stored wheat. From the above two methods of application of treatments against rice weevil management the bimonthly method was found effective.

Keywords

Rice Weevil, Gunny Bags, Stored Wheat, Botanicals and Insecticides.

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