Tale of Two Crabapples: Diagnostics Is Never Easy
Summertime: And Diagnosis is never easy. Even with something as dear to my pathological brain as apple scab and cedar-apple (or hawthorn) rust on crabapple. I was on a walkabout at a northeast Ohio commercial landscape two weeks ago and came upon side-by-side crabapples – and the different symptoms of these two diseases on crabapple.
On one crabapple, apple scab infections caused some affected leaves to turn yellow before dropping; on the other crabapple the leaves turned orangish-red (the cover photo). As for rust, the lesions on the upper leaf surfaces of one crabapple...
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