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Some elms are sensitive to spraying, as are some maples. I've had issues with pyrethrin-based sprays and tridents...

Best thing to do isn't to dilute one that's already proven to be bad, but swithc to one that isn't. Try a sample spraying of a small section of the infested tree. See if the plant has issue with the spray, if it does, find another pesticide. A numer of them will do away with those leafhoppers.

19-May-2006	#3
rockm bonsaiTALK ArchMaster Join Date: Oct-2003 Location: Fairfax, Va Country: USA USDA Zone: 7 AHS Heat Zone: ? Posts: 4,561	Some elms are sensitive to spraying, as are some maples. I've had issues with pyrethrin-based sprays and tridents... Best thing to do isn't to dilute one that's already proven to be bad, but swithc to one that isn't. Try a sample spraying of a small section of the infested tree. See if the plant has issue with the spray, if it does, find another pesticide. A numer of them will do away with those leafhoppers.