During the long winter and early spring the roots die because of the shortage of carbohydrates reserves. Crown die back occurs to compensate for the loss of feeder roots. This explains why so many ash trees in the metro area are showing symptoms of die back and decline especially ash trees already weakened by other stress factors. Depending on the weather a 2nd application may be needed later on in late spring. If it is dry, the 2nd application will not be necessary.
Suggested products are Daconil or other chlorotholnil products.
Fire blight causes disfigurement of the branches and may cause death. Symptoms of fire blight include rapid wilting and curling of small branches, dead persistent leaves, discoloration or streaking of sap wood in infected branches and the presence of cankers on branches or trunk. A distinctive sticky ooze exuding from cankers. Fire blight is caused by a bacterium Erwinia Amylouora. This bacterium infects the tree through flowers or wounds in the new growth.