Understanding the mechanism of increasing susceptibility of insects to baculovirus by fluorescent brightener
2005
El-Salamouny, Said | Kleespies, Regina G. | Huber, Jürg
Fluorescent brighteners are applied to enhance the virulence of baculoviruses. In the present study, Fluorescent Brightener 28 was used to increase the susceptibility of noctuid larvae to different viruses. It was shown that this fluorescent brightener increases the susceptibility of Agrotis segetum (Lepidoptera: Noctuidae) to granulovirus more than to nucleopolyhedrovirus. Since there are indications that fluorescent brighteners influence the peritrophic membrane, histological investigations on this membrane were conducted with light microscopy. The peritrophic membrane of late A. segetum larvae is multilayered and lines the whole midgut. It functions as a mechanical barrier and ultrafilter to parasites and pathogens and as envelope for fecal pellets. The addition of fluorescent brightener to the diet of this noctuid dissolved the peritrophic membrane, which explains the increase in susceptibility to its viruses.
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Publisher IOBC / WPRS
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