ARTICULARIA LEAF MOLD
Articularia leaf mold caused by the fungus Articularia quercina (PK) Hoehn is a disease of minor occurrence and importance. The disease occurs most commonly following rainy periods and in areas of high relative humidity in the leaves of trees of poor vigor.
The fungus produces on the lower surfaces of the leaves a conspicuous growth of white tufts which contain masses of spores, [Figure 6].
Figure 6. Articularia leaf mold fungus, showing white tufts on lower leaf surfaces of pecan leaflets.
Control.—Articularia leaf mold does not occur in trees or in orchards which have been sprayed for disease control.
A single application of fungicide such as zineb at 2 pounds per 100 gallons of water when the disease is first detected is usually sufficient to control Articularia leaf mold disease.