How to Manage Pests
Pests in Gardens and Landscapes
Eutypa dieback—Eutypa lata
Eutypa dieback, also known as Cytosporina, gummosis, and limb dieback, causes limbs or twigs to wilt
and die suddenly in late spring or summer with the leaves still attached. Rough dark cankers may develop
at pruning wounds. The bark has a dark discoloration with amber-colored gumming.
Eutypa dieback occurs when fungus spores are spread by rain and infect trees through pruning wounds.
Remove infected limbs at least 1 foot below any sign of the disease. Prune during July and August after
harvest. Ideally, pruning should be completed at least 6 weeks before the first fall rains. Wound treatments
with fungicides, paints, or sealants have not been satisfactory. Cauterizing freshly pruned branches with
a hand-held propane burner may prevent infection.
branch killed by Eutypa dieback
on apricot branch