Abstract
Three species of hemipteran predators preyed differently upon 1st instarHeliothis punctiger Wallengren larvae.Cermatulus nasalis consumed more larvae thanOechalia schellenbergii which consumed more larvae thanTropiconabis nigrolineatus. All the species consumed significantly less 1st instar larvae on plants than what they consumed in Petri-dishes. Fifth instar predators showed significant differences in terms of prey consumption due to sex independent of searching conditions. Only 4th and 5th instars ofT. nigrolineatus attacked and captured 2nd instars ofH. punctiger larvae. The other 2 species however readily attacked and consumed 2nd instarH. punctiger larvae. Their prey consumption was similar in Petri-dishes and on plants.
Only 5th instars ofT. nigrolineatus could subdue and capture 3rd instarH. punctiger larvae. Second instar pentatomids captured just one 3rd instar larva but older instars killed and ate more. Fourth instarH. punctiger larvae were immune to attacks by allT. nigrolineatus and younger pentatomids due to their defense ploys but 5th instar pentatomids could subdue and capture them.
None of the predators captured 5th instarH. punctiger larvae except few 5th instar females ofC. naslis andO. schellenbergii.
Résumé
Trois espèces d'Hémiptères prédateurs se nourrissent différemment sur les premiers stades larvaires d'Heliothis punctiger Wallengren.Crematulus nasalis consomme plus de larves qu'Oechalia schellenbergii qui consomme plus de larves queTropiconabis nigrolineatus. Toutes les espèces consomment significativement moins de 1er stades larvaires sur plantes que ce qu'elles consomment en boîte de Pétri. Les 5e stades des prédateurs manifestaient des différences significatives en terme de consommation de proies dues au sexe indépendamment des conditions de recherche. Seuls les 4e et 5e stades deT. nigrolineatus attaquaient et capturaient les L2 deH. punctiger. Les 2 autres espèces, cependant attaquaient rapidement et consommaient les L2 d'H. punctiger. Leur consommation en proies était identique en boîte de Pétri et sur plantes.
Seuls les 5e stades deT. nigrolineatus pouvaient dompter et capturer les L3 d'H. punctiger. Les 2e stades de pentatomides capturaient uniquement une L3, mais les plus âgés tuaient et mangeaient davantage. Les L4 d'H. punctiger échappaient aux attaques de tous les stades deT. nigrolineatus et des pentatomides plus jeunes, grâce à leurs stratagèmes de défense, mais les 5e stades des pentatomides pouvaient les dompter et les capturer. Aucun des prédateurs ne capturaient des L5 d'H. punctiger, si ce n'est quelques 5e stades femelles deC. nasalis et d'O. schellenbergii.
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Awan, M.S. Predation by three hemipterans:Tropiconabis nigrolineatus, Oechalia schellenbergii andCermatulus nasalis, onHeliothis punctiger larvae in two types of searching arenas. Entomophaga 35, 203–210 (1990). https://doi.org/10.1007/BF02374794
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DOI: https://doi.org/10.1007/BF02374794
Key-Words
- Comparative predation
- Oechalia schellenbergii
- Cermatulus nasalis
- Tropiconabis nigrolineatus
- native budworm
- searching arena