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The influence of overhead irrigation and microclimate on Colletotrichum phomoides



The influence of overhead irrigation and microclimate on Colletotrichum phomoides



Phytopathol 49(2): 72-74



Humidity and dew formation within the foliospheres differed considerable between overhead irrigated and nonirrigated tomato plots. Relative humidity (RH) between noon and 6 p.m. was as much as 20% higher in irrigated plots for 5 days following irrigation. The diurnal dew period (duration of free moistur.e) was commonly 3-5 hours longer in irrigated plots during this time. Overhead irrigation increased the incidence and severity of tomato anthracnose. In the laboratory, spores of Colletotrichum phomoides germinated at 93% RH, but, if first exposed 12 hours to RH below 80%, they did not germinate when placed in free water. It is concluded that the higher RH and longer dew periods in the microclimates of irrigated tomato plots prolong spore viability and permit germination of C. phomoides.

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Accession: 014254013

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