Green Global
Foundation   Journal
...an emerging window for scientific research and publication across the globe

STUDY ON RESISTANCE OF DIFFERENT RICE VARIETIES AGAINST RICE WEEVIL, Sitophilus oryzae (L.) (Pages : 35 - 40)

An experiment was conducted in the laboratory of Department of Entomology, Bangladesh Agricultural University, Mymensingh during June to October, 2004 to evaluate resistance, if any, of rice grains of 7 rice varieties viz, BR3, BR11, BR14, BR26, BRRI dhan28, BRRI dhan29 and Kalogira against rice weevil, Sitophilus oryzae (L). Resistance was tested against unhusked- unparboiled and husked- parboiled conditions of each of the varieties under controlled condition. Five pairs of adult rice weevil were confined on 50g of paddy or rice grains. Mortality of weevil populations within 10 days of confinement was observed. Mortality of initial weevil populations, new adult emergence, development and grain weight losses were considered as indicator of resistance. Among the grain conditions, unhusked- unparboiled paddy grains of all the varieties showed some degree of resistance against rice weevil. The variety Kalogira was consistently resistant against S. oryzae in all two conditions of rice grains, while resistance reaction of unhusked- unparboiled BR11 and BR3 paddy was not maintained after husking. The most resistant and susceptible variety suffered 3.34% (Kalogira) and 10.74% ( BR26) loss in unhusked- unparboiled condition and 4.34% (Kalogira) and 14.60% ( BR26) loss in husked- parboiled condition, respectively. Download