Research Article
MUSA, A. K.
Abstract
A laboratory experiment was conducted to examine the insecticidal potential of Hyptis suaveolens Poit. leaf and seed powders and pirimiphos-methyl dust on fourth instar larvae of khapra beetle, Trogoderma granarium Everts. Experiment was conducted at 26±30 C and 72±3% r. h. The leaf and seed powders at 1, 2 and 3 g/50 g were tested and then compared with pirimiphos-methyl at 0.1 g/50 g against T. granarium in groundnut seeds. Mortality was significantly (p<0.05) higher (56.7 and 83.3%) at 12 and 24 h exposure respectively, at 3 g/50 g seeds than at other rates. Treatments with leaf and seed powders applied at 3 g/50 g seeds were less effective in causing larval mortality and reducing adult population but not significantly different when compared to pirimiphos-methyl dust. Treatment of groundnut seeds with H. suaveolens leaf and seed powders probably had important practical implication in the southern Guinea Savanna of Nigeria.