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- Title
Effects of Temperature and Leaf Wetness on the Latent Period of <em>Rhynchosporium Secalis</em> (Leaf Blotch) on Leaves of Winter Barley.
- Authors
Davis, Helena; Fitt, B. D. L.
- Abstract
Effects of temperature and leaf wetness on the latent period of <em>Rhynchosporium secalis</em> (leaf blotch) on winter barley were examined in controlled environment experiments. At 100 % relative humidity (continuous leaf wetness) the mean length of the latent period was <em>c.</em> 24 days at 5°C, <em>c.</em> 19 days at 10 °C, <em>c.</em> 16 days at 15 °C and <em>c.</em> 13 days at 20°C. The mean number of days between the appearance of the first and the last lesions was <em>c.</em> 13 days at 5°C, <em>c.</em> 6 days at 10°C, <em>c.</em> 5 days at 15°C and <em>c.</em> 3 days at 20°C. A negative curvilinear regression of latent period on temperature accounted for 99 % of the variance. The mean area of lesions per leaf was 38 mm² at 5°C, 46 mm² at 10°C, 24 mm² at 15 °C and 24 mm² at 20°C. At 10°C, after a 48 h wet infection period, the interruption of leaf wetness for 5 or more days at any time during the next 15 days of the latent period did not decrease subsequent lesion area. However, absence of leaf wetness after these 15 days, at the onset of sporulation, did decrease the area of lesions which developed.
- Subjects
RHYNCHOSPORIUM secalis; BARLEY; LEAF temperature; BOTANY; REGRESSION analysis; HUMIDITY
- Publication
Journal of Phytopathology, 1994, Vol 140, Issue 3, p269
- ISSN
0931-1785
- Publication type
Article
- DOI
10.1111/j.1439-0434.1994.tb04816.x