Abstract
Eight insect predators common in the rice ecosystem in the Philippines were compared in the laboratory on their ability as to feed on the eggs of green hairy caterpillar,Rivula atimeta Swinhoe. A ranking, based on feeding rates was made:Metioche vittaticollis (Stål) (Gryllidae) was the most voracious predator, followed byAnaxipha longipennis (Serville)(Gryllidae), Ophionea nigrofasciata (Schmidt-Goebel)(Carabidae), Micraspis nr.crocea (Mulsant) (Coccinellidae) andConocephalus longipennis (de Haan) (Tettigoniidae). Also the smallCyrtorhinus lividipennis Reuter (Miridae), readily fed upon the eggs.Paederus fuscipes Curtis (Staphilinidae) andCoccinella repanda (Thunberg) (Coccinellidae) fed to a very limited extent.Metioche vittaticollis andCyrtorhinus lividipennis were also tested on eggs of green semilooper,Naranga aenescens Moore, and rice whorl maggot,Hydrellia philippina Ferino. The feeding rate ofM. vittaticollis was similar on the 3 different preys, butC. lividipennis had a higher feeding rate onN. aenescens eggs.
In 1.6 m2 field cages, different densities ofM. vittaticollis andO. nigrofasciata were allowed to feed on exposedR. atimeta eggs during 2 days.Metioche vittaticollis consumed 13 and 26 eggs at predator densities of 1 and 2 per cage respectively, but was not much higher at density 8. Predation byO. nigrofasciata was not significant.
Résumé
Huit insectes prédateurs communs dans l'écosystème du riz aux Philippines ont été comparés au laboratoire pour leur capacité à se nourrir sur les œufs de la chenilleRivula atimeta Swinhoe. Une échelle basée sur les taux de prédation a été établie:Metioche vittaticollis (Stal) (Gryllidae) était le prédateur le plus vorace suivi parAnaxipha longipennis (Serville)(Gryllidae), Ophionea nigrofasciata (Schmidt-Goebel)(Carabidae), Micraspis nr.crocea (Mulsant) (Coccinellidae) etConocephalus longipennis (de Haan) (Tettigonidae). Le petit Miride,Cyrtorhinus lividipennis, se nourrissait aussi facilement sur les œufs.Paederus fuscipes (Curtis) (Staphilinidae) etCoccinella repanda (Thunberg) (Coccinellidae) se nourrissait dans une mesure très limitée.Metioche vittaticollis etCyrtorhinus lividipennis ont été aussi testés vis-à-vis des œufs de la NoctuelleNaranga aenescens Moore et de la Mineuse du Riz,Hydrellia philippina Ferino. Le taux de prédation deM. vitaticollis était identique sur les trois proies, maisC. lividipennis manifestait un taux de prédation plus élevé sur les œufs deN. aenescens.
Dans les cages de plein air, de 1,6 m2, on permettait à différentes densités deM. vittaticollis et d'O. nigrofasciata de se nourrir sur des œufs deR. atimeta exposés durant deux jours.Metioche vittaticollis consommait 13 et 26 œufs aux densités respectives de 1 et 2 prédateurs par cage, mais la prédation n'était pas beaucoup plus élevée à la densité de 8. La prédation due àO. nigrofasciata n'était pas significative.
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Van Den Berg, H., Litsinger, J.A., Shepard, B.M. et al. Acceptance of eggs ofRivula atimeta, Naranga aenescens [Lep.: Noctuidae] andHydrellia philippina [Dipt.: Ephydridae] by insect predators on rice. Entomophaga 37, 21–28 (1992). https://doi.org/10.1007/BF02372970
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DOI: https://doi.org/10.1007/BF02372970