Abstract
Steinernema feltiae (=Neoaplectana carpocapsae) andHeterorhabditis heliothidis were tested against 3rd instarAedes aegypti larvae in the laboratory. Different dosages of the nematodes and varying durations of exposure were assessed.H. heliothidis was more effective thanS. feltiae. Larval mortality showed a positive linear correlation with both nematode dosage and the duration of exposure. The number of nematodes of both species that gained access to the haemocoele of larvae was always low, but increased with dosage and exposure time. The rate of melanization of the nematodes in the larvae was correlated with dosage, but was not affected by the duration of exposure.
Résumé
Steinernema feltiae (=Neoaplectana carpocapsae) etHeterorhabditis heliothidis ont été essayés en laboratoire vis-à-vis des larves de 3e Stades d'Aedes aegypti. Différentes doses de nématodes et des durées variables d'exposition ont été utilisées.H. heliothidis était plus efficace queS. feltiae. La mortalité larvaire montrait une corrélation linéaire positive avec à la fois la dose en nématodes et la durée d'exposition. Le nombre de nématodes des 2 espèces qui gagnait l'haemocèle des larves était toujours faible, mais il augmentait avec la dose et la durée d'exposition. Le taux de mélanisation des nématodes dans les larves était en corrélation avec la dose, mais il n'était pas affecté par la durée d'exposition.
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Molta, N.B., Hominick, W.M. Dose- and time-response assessments ofHeterorhabditis heliothidis andSteinernema feltiae [Nem.: Rhabitida] againstAedes aegypti larvae. Entomophaga 34, 485–493 (1989). https://doi.org/10.1007/BF02374386
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DOI: https://doi.org/10.1007/BF02374386
Key-Words
- Heterorhabditis heliothidis
- Neoaplectana carpocapsae
- DD-136
- Steinernema feltiae
- Aedes aegypti
- entomophilic nematodes
- dose-response
- time-response