Predatory capacity and intraguild interaction between aphidophagous predators in the control of rose bush aphids

IF 0.7 4区 农林科学 Q4 ENTOMOLOGY Revista Brasileira de Entomologia Pub Date : 2023-05-26 DOI:10.1590/1806-9665-rbent-2022-0107
Luiza Akemi Gonçalves Tamashiro, C. Bezerra, A. L. Sousa, Luiz Paulo Silvério Pereira, Laodicéia Lopes Pereira, Alessandra de Carvalho Silva, B. Souza
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Abstract

Chrysoperla externa (Hagen) and Hippodamia convergens (Guérin-Meneville) are voracious generalist predators, and important aphid control agents. In an environment containing a complex of species, the occurrence of intraguild interactions can interfere in the predator behavior and consumption. The aim of this work was to know the number of nymphs of Rhodobium porosum (Sanderson) and Macrosiphum rosae (Linnaeus) consumed by larvae of C. externa and H. convergens, and the interaction between these predators when confined together. First, second and third instar nymphs of R. porosum and M. rosae were provided in Petri dishes containing rose leaflets and second instar larvae of the predators. Intraguild interaction was studied in Petri dishes containing first instar nymphs of both aphid species and a second instar larva of C. externa plus one of H. convergens. A third treatment consisted of dishes containing a second instar larva of both predators maintained in the absence of prey. The evaluations took place throughout the entire instar of the predators. C. externa consumed a greater number of R. porosum nymphs and H. convergens a greater number of M. rosae nymphs. For both species of prey, the highest consumption was verified on the last day of evaluation. There was a positive interaction when the predator’s larvae were confined in the presence of aphid nymphs, with no mortality observed for any of them. In the absence of prey, there was 70% mortality of H. convergens larvae due to intraguild predation.
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1.50
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12.50%
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14
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6-12 weeks
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