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Show Agent advises on aphids Early aphid control, about April 13th to May 1st in Utah County, will help save snowball snow-ball bushes, elms, apple, cherry, peach and plum foliage from becoming badly curled, reminds re-minds County Agent Hassell. Dr. George Knowlton, Utah State University Extension entomologist, en-tomologist, says, "Once the aphids curl the leaves and are protected within, most sprays can do only a partial job of For example Cooley's spruce gall aphid should be sprayed with malathion soon after eggs hatch, but before the young aphids have settled at the base of the newly developing needles long enough to cause a "pine cone gall" to grow about and protect them from insecticides. control. Therefore, it pays to spray susceptible shrubs and trees soon after the overwintered overwin-tered aphid eggs havehatched, but not before." Proper timing is important. |