“Shot Hole” Disease” in flowering and fruit trees.
by Patti Nigh - January 11th, 2010.Filed under: Arborific Articles. Tagged as: Plant Health Care.
“Shot Hole” Disease
Coryneum byerinkii or Wilsononyces carpophiluscan
Shot hole disease can be a problem in both flowering and fruiting trees in the home landscape. This disease thrives with our typical long periods of wet spring weather in the Pacific Northwest. Shot hole disease attacks ornamental and fruiting varieties of all stone fruit; almonds, apricots, nectarines, peach, plums, prunes and cherry trees.
While the “shot holes” are found in the spring and summer, the disease starts much earlier. It manifests at first on young leaves as small reddish spots or lesions, that enlarge, become darker, and then drop out of the leaf blade leaving a “shot hole” appearance. Numerous holes give a very tattered appearance to infected leaves. In fruiting trees, similar spots or lesions will appear later, on the epidermis of the fruit itself. These disfiguring lesions can appear, anywhere from 10 to 12 weeks prior to harvest, through the post harvest period.
We need to begin deterring this disease with fall and winter dormant treatments, because twig and bud infections can occur during rainy weather anytime between fall and late spring. The fungus can geminate and infect at temperatures as low as 36 degrees Fahrenheit. Spores are spread by water; splashing rain or irrigation systems, as well as wind currents. The spores infect the tree through twigs, buds, blossoms and young leaves, so the dormant treatments should be followed by later spring applications.
It is always a good idea to do your own cultural control around your garden, for all fungus diseases. For “shot Hole’, be sure all your dead diseased leaves and fallen fruit are kept cleaned up and off your landscape at all time. It is best to not compost these leaves and fruit, but to completely remove them from your property. During summer watering do not let sprinkler systems wet the foliage and fruit. Prune out infected twigs during your annual pruning, if possible.
Call True Care Inc. (503-678-5388) today, for a free estimate.
January 24th, 2010 at 8:27 am
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