Abstract
Infection of the fat body of Lymantria dispar (Lep.: Lymantriinae) larvae with the microsporidium Vairimorpha disparis has severe effects on juvenile hormone (JH) metabolism of the host. Beginning 8days postinfection, activity of the JH degrading enzyme JH-esterase was significantly lower in the hemolymph of infected than uninfected larvae. Activity remained low as microsporidiosis progressed. JH titers were slightly elevated in infected larvae; the difference was not significant in most cases. This disturbance of JH metabolism may be due to generally impaired fat body functions and high demand for resources by the developing pathogen.
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