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G. Naga Bharani*, K.L. Painkra and Sanjay Sharma
Department of Entomology, College of Agriculture,
Indira Gandhi Krishi Vishwavidyalaya, Raipur – 492012.
Email: bharaniagrico@gmail.com
Received-05.04.2017, Revised-02.05.2017
Abstract: Studies were carried to evaluate the influence of plant nutrients @ 50:30:20kg/ha (50% recommended NPK level), 100:60:40kg/ha (100% recommended NPK level) and 150:90:60kg/ha (150% recommended NPK level) on insecticide toxicity at 24hrs, 48hrs, 72hrs and 96hrs after spray against leaf folder, Cnaphalocrocis medinalis (Guenee)in kharif 2015 and 2016. Among the tested insecticides, Rynaxypyr 18.5%SC and Cypermethrin 25%EC recorded the highest percent mortality followed by Fipronil 5%SC, Monocrotophos 36%SL. Moderate toxicity was recorded by Imidacloprid 17.8%SL and Acephate 75%SP. Under different nutrient levels i.e., 50%, 100% and 150%NPK leaf folder mortality was not affected in treatments Rynaxypyr 18.5%SC (90.83, 87.50 and 86.67% in kharif 2015; 90.00, 87.50 and 87.50% mortality in kharif 2016) and Cypermethrin 25%EC (85.00, 84.92 and 83.33% in kharif 2015; 83.00, 83.00 and 82.67% mortality in kharif 2016). Toxicity of Monocrotophos 36%SL (77.50, 71.67 and 66.67% mortality; 75.83, 71.67 and 67.50% mortality in kharif 2015 and 2016, respectively) was affected moderately with change in plant nutrition levels. Mortality of leaf folder in treatments Fipronil 5%SC (83.33, 74.17 and 65.00% mortality; 84.17, 74.17 and 65.83% mortality in kharif 2015 and 2016, respectively), Imidacloprid 17.8%SL (65.00, 56.67 and 48.33% mortality; 65.00, 58.33 and 49.17% mortality in kharif 2015 and 2016, respectively) and Acephate 75%SP (66.67, 58.33 and 50.83% mortality; 67.50, 57.50 and 50.83% mortality in kharif 2015 and 2016, respectively) were highly affected by different NPK levels i.e., 50%NPK, 100%NPK and 150%NPK.
Keywords: Host plant nutrition, NPK levels, Insecticides, Rice leaf folder
REFERENCES
Ahmad, Hafeez, Khan, R.B., Sharma, Devender, Jamiwal, V.V.S. and Srivastava, Kuldeep (2010). Assessment of yield infestation relationship of Cnaphalocrosis medinalis in rice. Annals of Plant Protection and Sciences, 18: 489-490
Bautista, R.C., Heinrichs, F.A. and Rejesus, R.S. (1984). Economic injury levels for the rice leaf folder, Cnaphalocrocis medinalis (Lepidoptera: Pyralidae): Insect infestation and artificial leaf removal. Environmental Entomology, 13: 439-443.
Chanu, N.Y. and Sontakke, B.K. (2015). Comparative Efficacy Of Chlorantraniliprole And Emamectin Benzoate Against Rice Leaf Folder. Indian Journal of Entomology, 77(3): 221 -225.
Dash, D. (2008). Influence of plant nutrients on effectiveness of insecticides against rice leaf folder, C. medinalis (Guenee). Journal of Plant Protection and Environment, 5(2):158-161.
Dash,D., Mishra, P.R. and Sarangi, P.K. (2008). Influence of graded levels of plant nutrient on the effectiveness of insecticides against rice gall midge, O. oryzae (Wood-Mason). Environment and Ecology, 26(3A): 1273-1275.
De, Kraker, Rabbinge, R, van, Huis, A, van, Lenteren, J. C. and Heong, K. L. (2000). Impact of Nitrogenous-fertilization on the population dynamics and natural control of rice leaf folders (Lepidoptera: Pyralidae), International Journal of Pest Management 46: 225-235.
Dhaka, S.S., Singh, G., Yadav, A., Ali, N. and Singh, D.V. (2012). Evaluation of some novel insecticides against rice leaf folder, Cnaphalocrocis medinalis (Guenee). Progressive Agriculture, 12(2): 360-364.
Manikandan, Narayanasamy, John, Samuel Kennedy and Geethalakshmi, Vellingiri (2014). Life History And Population Dynamics Of Rice Leaf folder at Different Temperatures. The Ecoscan 8(3&4): 315-320.