Aphids are tiny,soft-bodied insects that gather on new shoots, undersides of leaves, and tenderstems. They use their piercing mouthparts to suck sap from trees, robbingplants of essential nutrients. Over time, heavy infestations cause leaves tocurl, yellow, or distort. The sticky residue they leave behind, calledhoneydew, can lead to the growth of black sooty mold and attract ants.
Scale insects are more subtle and often go unnoticed. Unlike aphids, they attach themselvesfirmly to bark or leaf surfaces and appear as tiny, hard bumps — resemblingblisters or scabs. These pests drain sap continuously, weakening trees andcausing leaf drop, branch dieback, and slow decline in overall health.
Both aphids andscale insects weaken trees by disrupting nutrient flow. Homeowners may noticethinning canopies, sticky patios or vehicles beneath trees, and the appearanceof black mold on leaves. If untreated, repeated infestations can make treesmore vulnerable to secondary pests and environmental stress.
Successfulcontrol starts with accurate identification. Depending on the pest and treespecies, effective treatments include:
Routineinspections by a certified arborist help catch pest issues before they becomesevere. Seasonal feeding and proper watering improve tree resilience. Keepingpruning tools sanitized and removing heavily infested branches can also reducepest spread.
Looking to learn more about tree resources? Check out our tree resources page for tips, guides, and expert advice on keeping your trees healthy and safe.
