Managing rice gall midge and yellow stem borer with varietal resistance and insecticides Prasad Rabindra*, Hembrom Lakhindar, Kumar Binay, Prasad Devendra Department of Entomology, Birsa Agricultural University, Kanke, Ranchi, 834006 *Email: rabindraento@yahoo.co.in
Online published on 5 February, 2019. Abstract Rice gall midge (Orseolia oryzae WM) and yellow stem borer (Scirpophaga incertulas Wlk.) are the two major insect pests of rice in wet season in the state of Jharkhand In the present study, host plant resistance coupled with judicious insecticidal application was evaluated against these pests in field trials. The experiment was conducted in wet season during 2013 and 2014 with eight rice varieties in the randomized block design under protected and unprotected conditions. The pooled data reveal that the least incidence of silver shoot (1.85% SS) was obtained with variety Naveen (protected condition) and it was at par with that in IR-36 (1.98% SS) and Lalat (2.02% SS). Similarly, the least incidence of dead heart (2.22% DH) was observed in the variety Lalat (protected conditions), and it was at par with that of IR-36 (2.65% DH) and Naveen (3.51% DH). Need based protection measures remained effective in all the eight varieties. Under unprotected condition, tolerant/resistant varieties like IR-36, Naveen and Lalat exhibited less silver shoot, dead heart and white earhead. This is in comparison to the susceptible ones viz. IR-64, Birsa Mati, PAC-801, PAC-807 and TN-1. These observations conclude that the susceptible varieties require more insecticides, and need based protection proved effective. Also, yield enhancement from 28.72 to 40.97 q/ha; 24.92 to 40.85 q/ha; 24.92 to 39.34 q/ha; 27.20 to 37.97 q/ha and 30.38 to 37.30 q/ha was obtained with the varieties viz. PAC-807, Naveen, Birsa Mati, IR-64 and PAC-801, which accrues on account of the varietal intervention and need based insecticidal application. Hence, HPR and need based insecticide application is to be practiced as IPM tool for minimizing yield loss caused by the major insect pests of rice. Top Keywords Rice, HPR, stem borer, gall midge, insecticide, varieties, resistant, tolerant, susceptible, need based insecticide application, grain yield. Top |