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Influence of temperature and wetness duration on infection of immature strawberry fragaria ananassa cultivar midway fruit by phytophthora cactorum



Influence of temperature and wetness duration on infection of immature strawberry fragaria ananassa cultivar midway fruit by phytophthora cactorum



Phytopathology 75(2): 165-169



Strawberry fruits (cv. Midway) inoculated with a sporangial suspension (400 ml) of P. cactorum were used to determine the effects of wetness duration and temperature on infection level. Infection increased with increased wetness duration (0-5 h) at all temperatures tested (6.degree.-30.degree. C). For each wetness duration, infection increased up to the optimum temperature (21.degree. C) and then declined. At temperatures between 17.degree. and 25.degree. C, > 1 for wetness resulted in > 80% infection. A multiple-regression, logistic model accurately described infection as a function of wetness duration and temperature. The model was validated under natural field conditions.

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Accession: 005693191

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