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An evaluation of possible effects of climate change on pathogenic fungi in apple production using fruit rots as examples

Weber, Roland W. S.
Erwerbsobstbau 2009 v.51 no.3 pp. 115-120
Diplodia, Glomerella cingulata, Neofabraea, Neonectria ditissima, apples, branches, climate change, crop production, fruit trees, fungi, inoculum, insects, pathogens, phenology, plant rots, temperature, vegetation, Germany
Whereas the rise in temperature during the past 30-40 years has already had clear impacts on the phenology of fruit trees and pathogenic insects, there is a lack of such correlations for fungal pathogens. An examination of fruit rots indicates that pathogenic fungi react differentially to climate change due to their complex infection biology. The appearance of the black rot fungus Diplodia seriata in Northwestern Europe is best explained by rising temperatures during the vegetation period. An increase in fruit rot caused by Nectria galligena is anticipated when milder and more humid winter months favour canker formation on twigs and branches, thereby increasing inoculum for fruit infections. An increasing importance of Neofabraea alba and Glomerella cingulata and/or G. acutata as storage rots of apples in Northern Germany cannot be safely correlated with the climate change at present. Research on fungi is currently being expanded at the OVB Jork in order to ensure a faster identification of new pathogens and a more thorough investigation of relevant features of their infection biology.