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Influence of temperature and wetness duration on infection of immature and mature strawberry fruit by Colletotrichum acutatum



Influence of temperature and wetness duration on infection of immature and mature strawberry fruit by Colletotrichum acutatum



Phytopathology 80(1): 111-116



Immature and mature strawberry fruit were inoculated with a conidial suspension (2.5 X 10(4) conidia/ml) of Colletotrichum acutatum and incubated under various wetness (free water) durations ranging from 0.5 to 51 hr at constant temperatures of 4, 6, 10, 15, 20, 25, 30, and 35 C. After drying, plants were moved to a greenhouse where incidence of fruit infection was recorded daily for 8 days. No infection occurred at 4 or 35 C on immature fruit or at 4 C on mature fruit. Generally, fruit disease incidence increased with increased wetness durations, but on mature fruit at 35 C, disease incidence decreased over time from a maximum of 39%. Optimum temperature for infection on both immature and mature fruit was between 25 and 30 C, with greater than 80% disease incidence after 13 hr of wetness. A regression model using the logit of disease incidence as the dependent variable accurately described infection level as a function of wetness duration (W) and temperature (T). Terms in the model were W, WT, WT2, and WT3, and all estimated parameters were significant. Coefficients of determination for combined data from three repetitions of the experiment were 0.71 and 0.83 for immature and mature fruit, respectively.

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Accession: 001864119

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