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Eicosanoid biosynthesis inhibitors influence mortality of Pieris brassicae larvae co-injected with fungal conidia.

Influence of fungal species (conidia spores) on mortality of Pieris brassicae larvae differed when injected into the larvae. The effects of B. bassiana (ARSEF-1151) were expressed in a conidial dose-dependent manner on mortality of the larvae. An increased and faster mortality of the larvae followed B. bassiana (ARSEF-1151) infection when the spores were co-injected with the eicosanoid biosynthesis inhibitors (dexamethasone, naproxen, phenidone, esculetin). These compounds express different modes of action. These lethal effects were reversed when dexamethasone was injected with eicosanoid precursor arachidonic acid (20:4n-6). Nodulation is the predominant cellular reaction to bacterial and fungal injection in insects. Injection of each of five fungal species showed that nodulation intensity varies according to infecting fungal species. These findings support the idea that virulent effects of entomopathogenic, fungal species can be increased when P. brassicae immune systems are suppressed.