Importance. -- Actinopelte leaf spot can reach epidemic proportions
and cause major loss of foliage. Growth losses, increased stress on
the tree and unsightly conditions result. Overall, the disease normally
remains endemic and causes foliage loss only in the fall, with no subsequent
Identifying the Fungus. --
Small, brown, dot-like fruiting bodies are formed on the necrotic tissue.
Spores are elliptic and clear or colorless and can be microscopically
observed by crushing a fruiting body.
the Injury (figure 69). --
Round to irregular, red-brown spots develop along the leaf veins. The
spots are normally surrounded by light brown areas and may merge to
kill large areas of the leaf in late summer. Small twig cankers may
The fungus overwinters in the affected twigs and foliage. Spores of
the fungus are spread by wind and rain-splash the next growing season.
Collect and dispose of fallen leaves. Remove unneeded branches to increase
air movement. Fertilize to increase vigor and use fungicide sprays.