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Impact of Biopesticides on Budworm Incidence and Its Effect on Yield in FCV Tobacco

B K Shivanna1, B Gangadhara Naik2, Gayathri Devi S3, and Krishna Naika R4
1 Division of Entomology, University of Agricultural Sciences (B), All India Network Research Project on Tobacco, , Zonal Agricultural Research Station, Navile, Shimoga-577 204, Karnataka, India.
2 Division of Plant Pathology, Entomology, University of Agricultural Sciences, College of Agriculture, Research Station, Navile, Shimoga-577 204, Karnataka, India.
3 Division of Entomology, University of Agricultural Sciences, College of Agriculture, Research Station, Navile, Shimoga-577 204, Karnataka, India.
4 Division of Computer Sciences, University of Agricultural Sciences, College of Agriculture, Research Station, Navile, Shimoga-577 204, Karnataka, India.
Abstract—The extent of FCV tobacco leaf damage was upto 70 percent by insect pests due to the changed agro climatic situation, favourable climatic conditions and cropping patterns. In delayed plantings, the pest incidence coincides with the preferred stage of the tobacco. The registered recommended chemicals not only failed to suppress the pest but also pose adverse effects on health and environment. In order to circumvent the problems, conventional insecticides needs to be replaced with bio-pesticides. In a replicated field trial, efficacy of various bio-pesticides and synthetic insecticides were assessed against the key pest Helicoverpa armigera (Hubner) in FCV tobacco in kharif season at the Zonal Agricultural Research Station, Shimoga, Karnataka under rainfed conditions with a popular variety KST-19 during kharif 2010-11. ETL based sprays of these treatments were imposed after assessing 10 percent damage in leaves. Results showed that all the treatments were significantly superior over untreated control for various parameters observed against the budworm. Among the treatments, minimum number of larvae per plant was recorded in plots treated with flubendiamide 0.25 ml/l (0.33 & 0.00), novaluran 1 ml/l (1.00 and 0.00) and spinosad 0.5 ml/l (1.33 and 0.33) at three and seven days after treatment, respectively. Green and cured leaf yield was highest in flubendiamide (9364.01 and 1085.18 Kg/ha) and spinosad (8749.91 and 1075.55 Kg/ha) treatments, respectively. Highest total grade equivalent was recorded in spinosad (874.94 Kg/ha), flubendiamide (803.70 Kg/ha) and novaluron (661.72 Kg/ha) treatments. These chemicals can be used in IPM programme against H. armigera in tobacco .

Index Terms—Tobacco, bud worm, Helicoverpa, new molecules, botanicals.

Cite: B K Shivanna, B Gangadhara Naik, Gayathri Devi S, and Krishna Naika R, "Impact of Biopesticides on Budworm Incidence and Its Effect on Yield in FCV Tobacco," International Journal of Life Sciences Biotechnology and Pharma Research, Vol. 1, No. 1, pp. 75-80, January 2012.
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