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Ecology and Epidemiology

Models for Noninfectious Bud Failure in Almond. C. Ariel Lou Fenton, Department of Pomology, University of California, Davis 95616; Dale E. Kester, and Andrew H. Kuniyuki. Department of Pomology, University of California, Davis 95616. Phytopathology 78:139-143. Accepted for publication 5 May 1987. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/Phyto-78-139.

Development of bud failure symptoms in populations of Nonpareil and Carmel almond was modeled using the Weibull distribution. The logarithm of the scale parameter was found to be related to degree-days by a linear function. Use of a degree-day temperature threshold of 1532 C appeared to be optimal in predicting the magnitude of the scale parameter. In addition, a conceptual model was developed to account for the differences between the Nonpareil and Carmel populations.

Additional keywords: genetic disorder, Prunus amygdalus, P. dulcis, survival data analysis.