I’m a new pear grower in southern California. I received these two 4 ft bare root trees from raintree in January and planted them in the ground after soaking the roots in water. One is harrow delight and the other is Korean giant. They had no branches and no leaves when I received them. The new leaves emerged about a month ago and looked great. At some point these black edges started to appear on many of the leaves, more so on the harrow delight. They do not look like fire blight (I only know what fire blight looks like on apples). It’s been raining a lot in southern California this past week, but I am unsure of the timing of the black edges in relation to the rainy weather. I dormant spayed both trees with copper before any leaves or buds emerged.
The first two photos are from the harrow delight. The last photo is the Korean giant. I’ve looked carefully for pests but noted none except for minimal aphids that were easily fixed with some soap and water spray. Could this be due to soap?? I use very mild/ diluted dish soap on everything for aphids and never had a problem.
