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Nosema transitellae sp. n. was originally isolated from larvae of the navel orangeworm, Paramyelois transitella , reared on contaminated trash almonds. The life cycle of the pathogen includes the formation of quadrinucleate schizonts and sporonts that divide to form twin binucleate sporoblasts typical of the genus Nosema . The pathogen primarily invades fat and the silk and salivary glands. Larvae with heavy infections frequently develop melanized encapsulated fat lobes that are visible beneath the transparent cuticle. In laboratory tests, only the navel orangeworm and the red flour beetle, Tribolium castaneum , acquired lethal infections. The almond moth, Cadra cautella , the raisin moth, Cadra figulilella , the tobacco moth, Ephestia elutella , and the greater wax moth, Galleria mellonella , acquired benign infections. The sawtoothed grain beetle, Oryzaephilus surinamensis , was not susceptible. The ultrastructure of the spores of N. transitellae is similar to that of spores of N. whitei and N. oryzaephili . |
