Vol. 6, Special Issue 4 (2018)
Effect of different dose of nitrogenous fertilizers on the incidence of major insect pests of rice and their management
Author(s): Sanjay Kumar Ram and Dilip Kumar Pandey
Abstract: To investigate the effect of different dose of nitrogenous fertilizers on the incidence of major insect pests of rice and their management, the experiment had conducted at the research farm of Birsa Agricultural University, Ranchi. The incidence of major insect pests of rice viz., gall midge, Orseolia oryzae Wood Mason; rice leaf folder, C. medinalis; green leaf hopper, Nephotettix nigropictus (Stal.); stem borer, Scirpophaga incertulas (Wlk.); and rice hispa, Dicladispa armigera (Oliv.) were increased with the application of higher levels of nitrogen. The highest incidence of gall midge (13.2% silver shoots), leaf folder (19.7% damaged leaves), green leaf hopper (15 nymphs/10 hills) stem borer (8.7% dead hearts) at 60 days after transplanting (DAT) and hispa at 40 DAT (12.3% infested leaves) were recorded with the application of 120 kg N/ha which were significantly higher than 100 kg and 80 kg N/ha. The highest incidence of gall midge (12.0% silver shoots), stem borer (7.4% dead hearts), leaf folder (25.8% damaged leaves), green leaf hopper (45.87 nymphs/10 hills), gundhi bug (15.02 bugs/5 hills) at 60 days after treatment and rice hispa ( 30.7% infested leaves) at 40 DAT were recorded which were significantly reduced by nursery treatment with cartap hydrochloride 4G (caldan 4G)@ 1.0 kg a.i./ha, 5 days before uprooting the seedlings or seedling root dip in chlorpyriphos 20 EC (0.02%) followed by foliar application of monocrotophos 36 SL at 35 and 55 DAT. Higher grain yields of 24.75 and 24.24 q/ha were obtained with the application of 120 kg and 100 kg N/ha, respectively.
Pages: 57-60 | 1147 Views 150 Downloads
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How to cite this article:
Sanjay Kumar Ram and Dilip Kumar Pandey. Effect of different dose of nitrogenous fertilizers on the incidence of major insect pests of rice and their management. International Journal of Chemical Studies. 2018; 6(4): 57-60.
