Abstract
Competition between granulosis virus (GV) and the larval parasite,Sturmiopsis inferens Tns. (Tachinidae: Diptera), was studied in 3rd — and 4th — instar larvae of the sugarcane shoot borer,Chilo infuscatellus Snellen (Crambidae: Lepidoptera), under laboratory conditions. Mortality due to GV infection and parasitization was 76.8 and 47.6 per cent, respectively, when they were tested separately. But when hosts were infected simultaneously with microfeeding of GV and larval parasite, a significantly low parasitism (5.5%) was obtained compared to 74.8 per cent mortality by GV infection. When the larvae were microfed with the GV 6 days after inoculation with parasitic maggots, mortality due to the virus was reduced significantly to 20.5 per cent, but when the maggot inoculation was preceded by virus microfeeding 6 days before, parasitization was unsuccessful, while 75% of larvae died of virus. Results obtained from field — collected larvae also showed that significantly more parasite puparia were recovered from healthy larvae than from virus — infected larvae. Similar differences in parasitization were not obtained in the case of healthy or virus — infected pupae.
Résumé
La compétition entre le virus de la granulose (GV) et le parasite larvaire,Sturmiopsis inferens TNS (Tachinidae: Diptera) a été étudiée en conditions de laboratoire chez les 3e et 4e stades larvaires de la mineuse des pousses de la canne à sucre,Chilo infuscatellus, Snellen (Crambidae: Lepidoptera). La mortalité due à l'infection par le virus et au parasitisme était respectivement 76,8% et 47,6% quand chacun fut essayé séparément. Mais quand les hôtes furent infectés simultanément avec une microalimentation de virus et le parasite larvaire, un parasitisme faiblement significatif (5,5%) fut obtenu comparé à la mortalité de 74,8% due à l'infection par le virus. Quand les larves furent alimentées avec le virus 6 jours après l'inoculation au moyen des larves de parasites, la mortalité due au virus était réduite d'une façon significative à 20,5%, mais quand l'inoculation du parasite était précédée 6 jours plus tôt, d'une absorption de virus, le parasitisme était infructueux, tandis que 75% des larves mourraient de virose. Les résultats obtenus à partir des larves récoltées à l'extérieur montraient aussi que significativement on trouvait plus de pupes de parasite dans les larves saines que dans les virosées. Des différences identiques dans le parasitisme n'étaient pas obtenues dans le cas de pupes saines ou virosées.
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Easwaramoorthy, S., Jayaraj, S. Interaction between the tachinid parasite,Sturmiopsis inferens and granulosis virus in the sugarcane shoot borer,Chilo infuscatellus [Lep.: Crambidae] . Entomophaga 34, 121–127 (1989). https://doi.org/10.1007/BF02372595
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DOI: https://doi.org/10.1007/BF02372595