Question
Apricots and peaches--what causes the reddish or purple-brown spots on new leaves, buds, shoots and fruit?
Answer(s)
It is called Coryneum Blight or "shot hole" disease. It is a fungus that infests during cool, wet springs. It first forms dark spots with brown centers on the leaves. These centers eventually fall out, leaving a "shot-hole" appearance. The fruit has rough, corky blemishes with a red ring around the spot. Control includes: keeping leaves and fruit dry from sprinkler spray, proper pruning, maintaining good tree vigor and a fall clean up of debris around the base of the tree. A fungicide maybe applied in the fall after all the leaves have fallen, again in the spring at pink bud stage, full bloom and when leaves begin to appear.
Reference: “Coryneum Blight of Stone Fruits”, at http://extension.usu.edu/plantpath/fruit_diseases/fd_coryneum_blight.htm
Other Questions In This Topic
- I have a 6year old dwarf braeburn apple tree. It has gotten very tall and a large part of the tree split off in a windstorm. I need to prune it back and am wondering when I can safely do so.
- What is the proper time to fertilize fruit trees? Also, is there only one appropriate time of year to prune fruit trees?
- Mt aunt has a Italian plum tree. It is very old it has a lot of fruit on it all with little bumps on them. What is causing the little bumps and what is the regemine of what and when to spray if any?
- My wife and I just planted an Autumn Blaze Maple at our home in Syracuse. Do you have any advice for caring for this particular tree? Both in the long term and short term?
- How can I keep my pears and apples worm free?
- Our 4 year old peach tree is blossoming and we noticed a "web" full of caterpillars in one of the branch forks. Several of the 1/2 to 3/4 inch larvae were on other branches as well. EEWWW! What do I do?
- I have two new flowering pear trees that are being used as breakfast, lunch and dinner. I am not sure what is eating them the leaves have large scallops taken out of them. The lower branches have been affected more than the top ones. Any ideas?
- I have a bartlett pear tree. A Limb is almost black, but growth was still coming out of the ends, so i didn't prune it off the tree all the way in the spring. Now other parts of the tree are turning black, some of the leaves are curling and turning black as well as some of the fruit. Can I save the tree, or do I need to pull it out. Also will this spread to my other two nearby peach and apple tree.
