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Temperature stability of wet and dry conidia of nomuraea rileyi



Temperature stability of wet and dry conidia of nomuraea rileyi



Environmental Entomology 14(1): 87-91



All infectivity of dry and wet conidia of N. rileyi (Farlow) Samson was lost within 1 day of exposure at 50.degree. C. In contrast, no infectivity was lost after 448 days at -70.degree. C. At intermediate temperatures dry conidia were about twice as stable as wet conidia. The estimated half-life for dry conidia was < 1, 7, 50 and 200, and > 448 days at 50.degree., 25.degree., 5.degree., -10.degree. and -70.degree. C, respectively. The estimated half-life for infectivity of wet conidia at 50.degree. C was .apprx. 2.3 min. Exposure of wet conidia for 10 min at 20.degree., 30.degree. or 40.degree. C had no effect. More than 90% of the infectivity of wet conidia was lost at or above temperatures of 50.degree. C. Germination of conidia also was significantly reduced after exposure to temperatures .gtoreq. 30.degree. C. The estimated half-life for germination at 40.degree., 35.degree., 30.degree. and 25.degree. C was 1, 10, 12 and 30 h. Storage at -70.degree. C is recommended to ensure long-term infectivity of conidia of N. rileyi.

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Accession: 006585677

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DOI: 10.1093/ee/14.1.87


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