Transovarian transmission of Nosema plodiae in the Indian-meal moth, Plodia interpunctella |
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Authors: | William R. Kellen James E. Lindegren |
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Affiliation: | Stored-Product Insects Research Laboratory, Agricultural Research Service, USDA, Fresno, California 93727 USA |
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Abstract: | Twenty-five adult female Plodia interpunctella infected with Nosema plodiae laid 856 eggs in laboratory tests; 12.5% of the eggs were infected transovarially. The highest level of transmission by an individual female was 14 infected eggs of 27 laid (51.8%); the lowest level of transmission observed was 1 of 43 eggs (2.3%). All stages of N. plodiae were not transmitted with equal frequency; moreover, most eggs harbored predominently only the trophozoite stage of the pathogen. Approximately 80% of the infected eggs contained trophozoites almost exclusively; about 13.1% contained about an equal number of spores and trophozoites, and about 6.5% contained mainly spores. Histological observations indicated that infections may be initiated in nurse cells and subsequently transferred to associated oocytes. |
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