REPELLENT EFFECTS OF CERTAIN PLANT EXTRACTS AGAINST RICE WEEVIL, SITOPHILUS ORYZAE L. (COLEOPTERA: CURCULIONIDAE (original) (raw)

Sitophilus oryzae L. is cosidered primary pest of stored grains of warm climatic areas. In the present study, ethanol extract of Psidium guajava, Citrus reticulata, Citrus limon, Citrus sinensus and Azadirachta indica were evaluated for their repellent affects against rice weevil, S. oryzae L. Four concentration viz., 5% and 10%, 15% and 20% were used. For all treatments, repellent effects increased in dose dependent manner. Our results indicated that P. guajava was most effective while A. indica as least effective among all tested treatments. Other plat materials viz., C. reticulata, C. limon and C. sinensus recorded moderate effects that did not varied significantly. This may be due to presence of same bioactive compound in plants of same genus. So it was concluded all tested plants could be incorporated in IPM programs for the effective control of S. oryzae L.