Horticultural Diseases and Pests - Alphabetically
Horticultural Diseases and Pests - by Host
Many herbaceous and woody plants, including English ivy, hydrangea, Japanese aucuba,
pansy, cane berries; trees including ash, dogwood, elm, maple, oak, Southern magnolia, and sycamore.
Anthracnose appears early in the growing season. It affects many different plants,
but seldom kills them. On trees, infected leaves can look burned, much like those produced by
leaf scorch in hot, dry weather. However, leaf scorch browns leaf edges, while Anthracnose
generally browns leaves along the veins.
Symptoms depend on the affected plant. In general, the anthracnose fungi cause sunken spots of gray or
tan to dark brown on leaves, stems, fruit, or twigs. The spots may enlarge to cover the leaf. Leaves
may wither and drop. On trees it causes twig canker and dieback, leaf and shoot blight, and often
defoliation. The fungus that causes Anthracnose overwinters in twigs on the tree and becomes active
when temperatures permit its growth. Twig dieback occurs when a canker forms, enlarges, and girdles the twig.
Control of Anthracnase is by raking and removing and destroying fallen leaves and twigs
and pruning dead branches so the disease will not overwinter. Planting disease resistant
varieties and use of chemicals will also control Anthracnose.
Please check the "Extension Agents' Handbook of Insects, Plant Disease and Weed Control".
Click HERE for Kelly Solutions.