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Foliar Symptom Expression of Wood Decay in Actinidia deliciosa in Relation to Environmental Factors

August 2008 , Volume 92 , Number  8
Pages  1,150 - 1,157

Stefano Di Marco and Fabio Osti, Istituto di Biometeorologia, Consiglio Nazionale delle Ricerche, Via P. Gobetti, 101, 40129 Bologna, Italy



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Accepted for publication 15 April 2008.
ABSTRACT

Kiwifruit vines (Actinidia deliciosa var. deliciosa) have recently been affected by a new form of decay caused by several fungi that produce different types of wood deterioration in the trunk and cordons. Surveys were conducted over a period of 5 years to investigate epidemiological aspects of the disease in a typical Italian growing area (Emilia-Romagna), where kiwifruit is widely cultivated and where the disease was noted for the first time. The disease was widespread over the kiwifruit growing area surveyed, and its incidence increased over the course of the survey. No relationship was found between vineyard soil characteristics or management methods and the annual incidence of symptomatic vines. Foliar symptoms did not consistently express every season even on obviously infected vines. The time of appearance and the development of the disease were correlated with plant phenology and temperature. In particular, from June to August, temperature seemed to affect the annual incidence of the disease in terms of both symptomatic shoots and symptomatic vines. The aspects in common between the decay of kiwifruit and esca of grapevine could be hypothesized and are discussed.



© 2008 The American Phytopathological Society