Effect of plant powders tested against rice weevil, Sitophilus oryzae L (Coleoptera: Curculionidae) infesting stored sorghum was carried out. The experiment of ten plant powders at 2 per cent tested, among them Piper nigrum 2 % per cent seed powder was significantly different from all other treatments. At four days after the treatment highest mortality was registered in Sesbania grandiflora (81.10%) which was followed by Azadirachta indica (67.77 %), Capsicum annum (62.21%), Lantana camara (59.99 %) and Leucas aspera (44.44%) as untreated control recorded only 32.24 % mortality. The toxicity level of plant powders at 6 DAT, C. annum (91.11%) > A. indica (85.55%) > S. grandiflora (85.55%) > L. camara (74.44%) > Clitoria ternatea (73.33%) as compared untreated (46.66%). The experiment on adult emergence, no adult weevils were emerged from P. nigrum seed powder 2 % treated sorghum grains. Next best treatment is C. annum (18.00%), C. ternatea (23.66%) and Cassia angustifolia (26.33%), while 98 adult rice weevils emerged from untreated control. P. nigrum was significantly superior than all other treatments in inhibiting the adult emergence of S. oryaze, No grain weight loss was recorded P. nigrum 2 % seed powder treated sorghum grains at 30, 45 and 60 days after treatments. Next best plant powders reduce the grain weight loss is A. indica at 30 DAT(10.50%), 45 DAT(13.01%) and 60 DAT(18.58%) while, 36.26 (30 DAT), 39.21 (45 DAT) and 49.22 (60 DAT) per cen%t loss was registered in untreated control after 60 days after treatment.
Keywords: Plant powders, Sitophilus oryzae, Sorghum.