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In this study, the mothcidal efficacy of powders of Alstonia boonei (De Wild) stem bark and Acalypha godseffienna (Muell Arg.) leaf part was investigated at ambient temperature (28 ± 3 °C) and relative humidity (75% ± 6%). Adult Sitotroga cerealella were exposed to both botanical powders using contact toxicity test at 1-5 g/20 g of paddy rice and mortality was assessed after 24, 48, 72 and 96 h post-treatment, respectively. The control experiment was also set-up for each botanical. Generally, both botanical powders significantly (P < 0.05) evoked higher moth mortality when compared to control. But, none of both plant powders elicit complete moth mortality (100%) at all the experimental dosage and exposure time. Lower dosage of A. boonei was however required to achieve 50% (24 h: 0.672; 72 h: 0.006) mortality in S. cerealella when compared to that of A. godseffienna (24 h: 1.546; 72 h: 0.238). Also, A. boonei at all experimental dosage significantly reduced (P < 0.05) emergence of S. cerealella when compared to control while A. godseffiana applied only at 2-5 g/20 g of paddy rice significantly reduced (P < 0.05) adult emergence when compared to control. The effect of A. boonei on the percentage inhibition rate of S. cerealella was significant (F4,15 = 6.69; P = 0.003) while that of A. godseffiana was not significant (F4,15 = 1.65; P = 0.213). It could therefore be concluded that powders of both botanicals could serve as a suitable wherewithal to most synthetic insecticides for the protection of rice grains from infestation by S. cerealella.

brazilian journal of biological sciences

Assessment of powders of Alstonia boonei (De wild) and Acalypha godseffienna (Muell Arg.) as protectants of rice grains against infestation by Sitotroga cerealella (Olivier, 1789) (Lepidoptera: Gelechiidae)