الفهرس | Only 14 pages are availabe for public view |
Abstract Among the rice insecta, stem borer has been the major insect pest all along in the traditional rice growing regions of the world. Of the 20 different species of stem borer , striped, (Chilo suppressalis), yellow (Trypor, yza incerulEts), white (T. innotata) and pink (Sesamia inferens) are the major ones. Striped borer is estimated to cause yield losses ranging from 3 to 95% (Ghose 21 ~. 1960). Differences in host plant resistance to the insect pests in general is known over 100 years. Nevertheless, varieties combining a desired level of resistance to the pests were bred and released for general cultivations since only 1940 (Painter, 1951). Studies carried out since then to understand kind and level of resistance revealed the existence of three categories namely non-preference (unattractive to the pest for oviposition, feeding and shelter), antibiosis (phenomenon of adverse feeding effects on the growth and survival of larvae and fecundity of the pest) |