Abstract
Nosema cuneatum, sp. n., isolated from the grasshopper Melanoplus confusus, is characterized in fresh preparations by oval to cuneate spores averaging 4.8 μ long by 3.4 μ wide and by infections in the pericardium, fat body, gonads, tracheal matrix, midgut epithelium, Malpighian tubules, and neural tissues. Uninucleate, binucleate, and quadrinucleate schizonts, binucleate and dividing sporonts, and binucleate sporoblasts also were observed and described. Studies of infectivity showed that N. cuneatum caused disease symptoms within 10 days after per os inoculation and increased mortality within 18 days postinoculation: spores were prominent at 8–9 days postinoculation. N. cuneatum was transmitted experimentally to grasshoppers of the following species: Melanoplus sanguinipes, M. bivittatus, M. femurrubrum, M. differentialis, M. infantilis, and Schistocerca americana.
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