Infection of the corn earworm, Heliothis zea, with Nosema acridophagus and Nosema cuneatum from grasshoppers: Relative virulence and production of spores |
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Authors: | JE Henry EA Oma JA Onsager SW Oldacre |
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Institution: | Rangeland Insect Laboratory, Federal Research, Science and Education Administration, U.S. Department of Agriculture, Bozeman, Montana 59717 USA;Department of Entomology and Nematology, University of Florida, Gainesville, Florida 32611 USA |
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Abstract: | Per os inoculations of 4- to 6-day-old larvae of the corn earworm, Heliothis zea, with suspensions containing 106 spores of Nosema acridophagus or 104, 105, and 106 spores of Nosema cuneatum retarded the growth and development of the larvae. Migratory grasshoppers, Melanoplus sanguinipes, inoculated with N. acridophagus produced fewer spores than similarly inoculated corn earworms, but spore production was similar in these insects when they were inoculated with N. cuneatum. Standard bioassay procedures showed that spores of both microsporidians were some-what more virulent when they were produced in corn earworms than when they were produced in grasshoppers. Spores of these microsporidians might be produced more efficiently in corn earworm larvae than in grasshoppers. |
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Keywords: | Corn earworm grasshoppers Acrididae Nosematidae Microsporidia |
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