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Annals of Botany 79: 121-128, 1997
© 1997 Annals of Botany Company

Development of a Model to Predict the Effect of Temperature and Moisture on Fungal Spore Longevity

T. D. HONG, R. H. ELLIS+ and D. MOORE

Department of Agriculture, The University of Reading, Earley Gate, P.O. Box 236, Reading, RG6 6AT, U.K. International Institute of Biological Control, Silwood Park, Buckhurst Road, Ascot, Berks, SL5 7TA, UK

February 5, 1996 ; July 30, 1996

A model was developed to quantify the effect of temperature and moisture content on the longevity of conidia of the entomopathogenic fungusMetarhizium flavoviride . This model incorporated a negative semi-logarithmic relation between longevity and temperature and a negative logarithmic relation between longevity and moisture content. Replacing the latter with a negative semi-logarithmic relation between longevity and the equilibrium relative humidity of the conidia was also effective. The latter model was applied successfully to observations on the survival of conidia of a further four entomopathogenic fungi (Metarhizium anisopliae ,Beauveria bassiana ,Beauveria brongniartii, andPaecilomyces farinosus ) and ascospores, conidia or uredospores of four phytopathogenic fungi (Alternaria porri ,Helminthosporium oryzae ,Uromyces appendiculatus , andSclerotinia sclerotiorum ) across a wide range of different temperatures and relative humidities. The sensitivity of spore longevity to both temperature and equilibrium relative humidity, and the upper and lower relative humidity limits to the application of the model, varied considerably between entomopathogenic and phytopathogenic fungi, among species within each group, and among different strains within certain species.

Metarhizium flavoviride W. Gams & J. Roszypal; entomopathogenic fungi; phytopathogenic fungi; spore survival; storage environment; conidia; uredospore; ascospore


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