Scab Occurrence on Pecan Clones in Alabama in a Year of High Disease Incidence
DOI:
https://doi.org/10.71318/apom.1993.47.1.47Abstract
Occurrence of scab, a fungus disease of pecan ( Carya illinoensis(Wangenh.) K. Koch) caused by Cladosporium caryigenum(Ell. et Lang.) Gottwald [= Fusicladium effusumWint.) was rated on 63 pecan clones at five locations in Alabama during a year of high disease incidence. Locally-selected clones of seedling origin, ‘Deakle’s Special,’ ‘Dixie,’ and ‘Gafford,’ were entirely free of scab symptoms on both nuts and leaves of unsprayed trees. Advanced USDA selections 70-3-34 and 72-2-9 had very low scab incidence. Seven other USDA selections, 75-5-32, 78-15-51, 72-6-36, 76-7-41, 73-1-10, 72-10-51, and 70-4-9 had significantly worse scab than did the standard cultivar ‘Desirable.’
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