Pecan scab
Fungal disease of pecan trees / From Wikipedia, the free encyclopedia
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Pecan scab is the most economically significant disease of pecan trees (Carya illinoinensis) in the southeastern United States.[1] Venturia effusa is a fungal plant pathogen that causes pecan scab. The fungus causes lesions and tissue death on pecan twigs, petioles, leaves, nuts and shucks beginning in early spring, with multiple cycles of infection repeating until late summer. Wind and rain spread the fungus to a susceptible host. Control of the disease is achieved by fungicide, sanitation and, in some cases, quarantine.[2]
Since its first description in 1882, the pecan scab fungus has been reclassified ten times,[3] with other names such as Fusicladium caryigenum, Cladosporium effusum and Cladosporium caryigenum commonly associated with the fungus.[4]