Abstract:The effects of four mycotoxins: aflatoxin B1(AFB2), aflatoxin B2(AFB2), aflatoxin G1(AFG1) and kojic acid (KA) onSpodoptera littoraliswere investigated. Second instar larvae were allowed to feed on an artificial diet containing various concentrations of either AFB1(0.5, 1, 2, 2.5, 3 and 3.5 ppm), AFB2(2, 3 and 4 ppm), AFG1(1, 2, 3 and 4 ppm), or KA (up to 100 ppm). Mortality, development time, fecundity, egg hatchability and adult longevity were determined for each treatment and compared to control values. AFB1(2–3.5 ppm) and AFG1(3 and 4 ppm) delayed the larval and pupal development and reduced the fecundity and hatchability. AFB2(4 ppm) reduced fecundity and hatchability but did not affect the development rate. The highest mortality was caused by AFB1(3.5 ppm). KA had no remarkable effect when given alone, even in concentrations up to 100 ppm. Yet it potentiated the toxicity and sterilizing activity of AFB1. A combination of AFB1(3.5 ppm) and KA (75 ppm) caused more than 92% sterility among male and female moths. Sterilized males exhibited good, though not fully equal, mating competitiveness against control males. The possibility of making use of the chemosterilizing activity of these mycotoxins is discusse