Cannibalism of <Emphasis Type="Italic">Brontocoris tabidus</Emphasis> and <Emphasis Type="Italic">Podisus nigrispinus</Emphasis> during periods of pre-release without food or fed with <Emphasis Type="Italic">Eucalyptus cloeziana</Emphasis> plants |
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Authors: | Evaldo Martins Pires José Cola Zanuncio José Eduardo Serrão |
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Institution: | 1.Instituto de Ciências Naturais, Humanas e Sociais (ICNHS),Universidade Federal de Mato Grosso,Sinop,Brazil;2.Departamento de Biologia Animal,Universidade Federal de Vi?osa,Vi?osa,Brazil;3.Departamento de Biologia Geral,Universidade Federal de Vi?osa,Vi?osa,Brazil |
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Abstract: | Pre-release techniques aim to increase the searching by the predators for their prey. Keeping bug predators for periods without
food before their release can increase the search ability of these insects. However, this practice can increase the cannibalism
during mass rearing. Brontocoris tabidus (Signoret) and Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) were kept for 12, 24, 36 and 48 h without food or with only Eucalyptus cloeziana plants in order to verify the occurrence of cannibalism on adults and eggs. Insects kept for periods longer than 24 h showed
higher cannibalism on adults and eggs and the presence of a E. cloeziana plant decreased the cannibalism during all the treatment periods. These predators preferred to attack first the eggs rather
than the adults, probably because of the inability of the former to avoid predation. The pre-release period should not exceed
24 h and plants must be provided to the predators in order to reduce the occurrence of cannibalism and increase the predatory
capacity of these natural enemies. |
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