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Inter- and intraspecific interactions in two mealybug predators Spalgis epius and Cryptolaemus montrouzieri in the presence and absence of prey

Published online by Cambridge University Press:  18 September 2013

A.S. Dinesh  and
M.G. Venkatesha
A.S. Dinesh
Affiliation:
Department of Zoology, Bangalore University, Jnanabharathi, Bengaluru 560056, Karnataka, India
M.G. Venkatesha*
Affiliation:
Department of Zoology, Bangalore University, Jnanabharathi, Bengaluru 560056, Karnataka, India
*
*Author for correspondence Phone: +91 9448689080 Fax: 91 80 23211020 E-mail: [email protected]
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Abstract

Spalgis epius and Cryptolaemus montrouzieri are the two potential predators of different species of mealybugs. However, the mode of their interactions is not known to use these predators together in the field. Hence, we investigated on the possible interactions i.e., cannibalism, intraguild predation (IGP) and competition between the predators in the presence and absence of prey Planococcus citri. In the presence of prey, no cannibalism and predation were observed in both S. epius and C. montrouzieri larvae. A pair of S. epius larvae consumed significantly more number of mealybugs than one S. epius/C. montrouzieri larva or a pair of C. montrouzieri larvae. The predation of S. epius larva by C. montrouzieri larva was significantly more than the predation of C. montrouzieri by S. epius. Conspecific and interspecific egg predation was absent both in S. epius and C. montrouzieri. Cannibalism in C. montrouzieri was more than that in S. epius. The study indicated that C. montrouzieri larvae can be used as an additive along with voracious S. epius larvae under abundant prey population. IGP was asymmetric between the two predators in the absence of prey. Both S. epius and C. montrouzieri larvae can maintain a stable coexistence when prey is abundantly available, however, in the complete absence of prey C. montrouzieri may dominate the guild. This study provides an insight into the possible complex inter- and intraspecific predatory phenomena in the field to use these two predators in the biological control of mealybugs.

Keywords

inter- and intraspecific interactionscannibalismintraguild predationSpalgis epiusCryptolaemus montrouzieriPlanococcus citri
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 104 , Issue 1 , February 2014 , pp. 48 - 55
Copyright
Copyright © Cambridge University Press 2013 

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