Brown, scabby areas can be found on the showy fruit of this plant. Plant resistant cultivars such as 'Mohave,''Teton' and others. Fungicide sprays can protect the fruit if they are applied during flowering and repeated several times at 7-10 day intervals. Anthracnose on black walnut - and lots of other leaf spot diseases on shade trees. Most of the photosynthetic activity has occured for these plants and there is no need for control.
Young foliage is deformed and covered with white mycelia.
Older foliage will appear reddish or brownish before fall color should occur. Armillaria root rot on tulip poplar - this could be a primary or secondary pathogen. By peeling away the bark, we saw strands of dried fungal mycelia. Oak lace bug on white oak - sure enough this oak had significant lace bag damage with an existing population. Winterthur plans to keep an eye on this tree next year.