This study evaluated the safety of bio insecticide derived from Stemona curtisii Hook.
F. and Mammea siamensis Kosterm. on reproductive system of male rat. The rats were orally
administered with bioinsecticide at the doses of 2, 10 and 50 mg/kg body weight for 60
consecutive days in comparison with 2 mg/kg body weight of methomyl. It was found that rats
treated with the bioinsecticide and methomyl showed a significant decrease in testis, seminal
vesicle and prostate weights when compared to control rats (p < 0.05). Nevertheless, a decrease
in epididymal sperm concentration and the histopathological alterations of the rat’s testes were
found only in rats treated with methomyl, but not with bioinsecticide.