Résumé
La distribution deNosema henosepilachnae Toguebaye & Marchand, 1984 (Microsporida, Nosematidae) au cours du développement deHenosepilachna elaterii Rossi, 1794 a été étudiée en microscopie photonique et électronique. Les insectes ont été récoltés au Sénégal sur plants de melon (Colocynthis citrullus L L.), puis élevés au laboratoire.
La microsporidie se développe d'abord dans le vitellus des œufs, puis dans les divers tissus des embryons. Chez les larves et les adultes, elle provoque ensuite une infestation généralisée. On trouve de nombreuses spores principalement dans le tissu adipeux, les tubes de Malpighi, les muscles, les gonades et le tissu nerveux.
La transmission se fait très probablement par les voies transovarienne, orale et vénérienne. Cette microsporidiose réduit la fécondité des adultes mais ne provoque pas la mort immédiate de son hôte.
Summary
The distribution ofNosema henosepilachnae Toguebaye & Marchand, 1984 (Microsporida, Nosematidae) during development ofHenosepilachna elaterii Rossi, 1794, has been studied by light and electron microscopy. Insects were collected in Senegal, on melon (Colocynthis citrullus L.), then bred in laboratory.
The microsporidia develops first in the egg vitellus, then in various tissues of the developing embryo. In larvae and adults it causes a general infection. Numerous spores were found in adipose tissue, Malpighian tubules, muscles, gonades and nervous tissue.
Obviously this microsporidiosis is transovarially, venerally and perorally transmitted. It reduces adult fecundity, but does not cause immediately the death of its host.
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Toguebaye, B.S., Marchand, B. Etude histopathologique et cytopathologique d'une microsporidiose naturelle chez la coccinelle des cucurbitacees d'afrique,Henosepilachna elaterii [Col.: Coccinellidae] . Entomophaga 29, 421–429 (1984). https://doi.org/10.1007/BF02372164
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DOI: https://doi.org/10.1007/BF02372164