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Germination and Sporulation of Colletotrichum acutatum on Symptomless Strawberry Leaves

July 2001 , Volume 91 , Number  7
Pages  659 - 664

L. F. S. Leandro , M. L. Gleason , F. W. Nutter , Jr. , S. N. Wegulo , and P. M. Dixon

First, second, third, and fourth authors: Department of Plant Pathology, Iowa State University, Ames 50011; and fifth author: Department of Statistics, Iowa State University, Ames 50011

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Accepted for publication 28 March 2001.

The germination and sporulation of Colletotrichum acutatum were characterized over time on strawberry leaves (cv. Tristar) and plastic coverslips incubated at 26°C under continuous wetness. Conidia germinated within 3 h after inoculation and formed melanized appressoria with pores by 9 h after inoculation. Host penetration was not observed up to 7 days after inoculation. Production of secondary conidia on conidial and hyphal phialides began within 6 h after inoculation. Secondary conidiation was responsible for up to a threefold increase in the total number of conidia within 7 days after inoculation. Primary conidia and hyphae began to collapse 48 h after inoculation, whereas melanized appressoria remained intact. These findings suggest that appressoria and secondary conidia of C. acutatum produced on symptomless strawberry foliage may be significant sources of inoculum for fruit infections.

Additional keywords: anthracnose , microcyclic conidiation , phyllosphere ecology .

© 2001 The American Phytopathological Society