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1 June 2015 Lethal and Sublethal Effects of Cantharidin on Development and Reproduction of Plutella xylostella (Lepidoptera: Plutellidae)
Zhengyu Huang, Yao Wang, Yalin Zhang
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The diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae), is a major pest of cruciferous vegetables throughout the world. Cantharidin, a natural toxin isolated from beetles in the families Meloidae and Oedemeridae, has been reported to be toxic to some pests, including the diamondback moth. However, the effects of cantharidin, especially its sublethal effects on development and reproduction of diamondback moth, are less known. In this study, we investigated the sublethal effects of cantharidin at LC2 (0.41mg liter-1), LC10 (1.33mg liter-1), LC25 (3.38mg liter-1), and LC50 (9.53mg liter-1) on development and reproduction parameters of two consecutive diamondback moth generations. The results indicated that cantharidin reduced population growth by decreasing its pupation rate, pupal weight, and adult emergence, and by delaying its development. Furthermore, the duration of the female preoviposition period increased, while the oviposition and postoviposition periods, fecundity, and survival rates of the offspring decreased. The peaks of age-specific fecundity in LC10, LC25, and LC50 treatment groups lagged behind the control group. The mean values of the net reproductive rate (R0), intrinsic rate of increase (r), and finite rate of increase (λ) were significantly lower than those of the control, and the mean generation time (T) was prolonged. The present study demonstrates that cantharidin exhibits significant adverse effects on the population dynamics of diamondback moth, leading to fitness disadvantages.

© The Authors 2015. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For Permissions, please email:
Zhengyu Huang, Yao Wang, and Yalin Zhang "Lethal and Sublethal Effects of Cantharidin on Development and Reproduction of Plutella xylostella (Lepidoptera: Plutellidae)," Journal of Economic Entomology 108(3), 1054-1064, (1 June 2015).
Received: 15 August 2014; Accepted: 25 February 2015; Published: 1 June 2015

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biological parameter
diamondback moth
population fitness
sublethal concentration
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