yellow aphids in pecan trees
I have a pecan tree that has yellow aphids and is producing alot of stick dew. Is it to late to treat for the aphids in September or should I wait and use dormant oil in the winter? I don't want to spend the money to have the trees treated if the problem is about to go away.
I would not recommend spraying for aphid control at this time of year. Aphid populations will be declining with the onset of fall weather. Actually, the value of spraying for aphid control may be minor. The honeydew secreted by the aphids will support sooty mold which can lessen the photosynthetic capability of the leaves. Rinsing the leaves with water will wash off some of the honeydew.