Effect of abiotic factors on the rice caseworm Nymphula depunctalis (Guenee) in Manipur Yumnam Surbala*, Singh K. I.1, Ray D. C. Department of Ecology and Environmental Science Assam (Central) University, Silchar, 788011, Assam 1Department of Entomology, College of Agriculture Central Agricultural University, Imphal-795004, Manipur *Email: yumnamsurbala@gmail.com
Online published on 12 June, 2017. Abstract Incidence of rice caseworm, Nymphula depunctalis was studied by quadrat method in two sites viz., Iroisemba and Wabagai on rice varieties, RCM-9 and Jatra-phou in kharif, 2013–2014. At Iroisemba, the maximum adult (2.7± 0.26/quadrat) and larval populations (2.4±0.45/quadrat) were recorded from the RCM-9 variety in the first week of September and 3rd week of August, 2013, respectively. At Wabagai, the maximum adult (2.3±0.30/quadrat) and larval population (1.9±0.41/quadrat) were during the last and 2nd week of August, 2013, respectively. Multiple correlation analyses revealed a nonsignificant relationship of abiotic factors with adult population except in Jatra-phou in the Wabagai variety. However, with larval population, the abiotic factors had a significant correlation, and partial correlation (t-test) revealed positive significant relationships with mean temperature and rainfall. Top Keywords Nymphula depunctalis, kharif, Iroisemba, Wabagai, RCM 9, Jatra-phou, temperature, relative humidity, rainfall, sunshine hours, correlations. Top |