have been observed in apple-producing regions of central and southeastern France. Since 2016, leaf blotch and premature tree defoliation attributed to Alternaria spp. A cluster of genes located on conditionally dispensable chromosomes (CDCs) is involved in the production of this HST (namely AMT in the case of theĪpple pathotype). The apple pathotype is characterized by the production of a host-selective toxin (HST) which is involved in pathogenicity towards the apple. Both taxa may include the Alternaria apple pathotype, a quarantine or regulated pathogen in several countries. The disease is usually associated with one phylogenetic species and one species complex, Alternaria alternata and the Alternaria arborescens species complex (A. is a common disease in apple-producing regions.
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