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Cucurbitacin B is a natural triterpene present in plants of Cucurbitaceae family, which are among the host plants for melon aphid,  Aphis gossypii . In present study we characterized the effects of two cucurbitacin B concentrations on the biological parameters of adults (F 0 ) and of juveniles and adults of their progeny (F 1 ). The results showed that cucurbitacin B at 25 ppm significantly reduced the adult longevity and fecundity of both F 0  and F 1  generation. Exposure of F 0  generation to 25 ppm though reduced the demographic traits of F 1  including the intrinsic rate of increase  r  (day −1 ), generation time  T  (day), finite rate of increase  λ  (day −1 ), however, only net reproductive rate  R  0  (offspring/individual) decreased significantly. While 100 ppm reduced not only the longevity and fecundity of F 0  generation but also the longevity of F 1  generation. Fecundity of F 1  was not affected by 100 ppm of cucurbitacin B, however,  R  0  (offspring/individual) and  T  (day) of F 1  generation were lower than the control population. These results support the hypothesis that high contents of cucurbitacin B caused negative impact on melon aphid and could be used as a lead for classical selection of resistant varieties of plants that are main hosts for the melon aphid.

Impact of the secondary plant metabolite Cucurbitacin B on the demographical traits of the melon aphid, Aphis gossypii