障碍形态发生肽类激素的释放，影响蜕皮激素、保幼激素滴度，抑制生长发育并使生殖力下降；
It acts on ecdysteroid and juvenile hormone titres through a blockage of morphogenetic peptide hormone release and results in growth inhibition and fecundity decline.
结论：川楝素和印楝素通过对家蝇生长发育和生殖能力的抑制，使其种群增长率降低。
Conclusion: Both toosendanin and azadirachtin can throw influences on growth development and fecundity of the target insects, reducing the increase rate of the experimental populations.
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