Basswood/Linden – Leaves – Dots, spots or blotches

Diagnosis – Bashwood or Linden Problems on LeavesDots, Spots or BlotchesBasswood LacebugsBasswood LeafminerBasswood ThripsEuonymus ScaleLinden Leaf BlotchPowdery MildewSooty MoldBasswood Lacebugs Basswood lacebugs or Gargaphia tiliae Needle-like mouthparts cause white or yellow speckled or pinprick discolorations that are visible on upper leaf surfaces Defoliation can occur when trees are severely infested Lace bugs are up to…

Ash – Trunk or Branches – Dead Branches

Diagnosis – Ash Tree Problems on Trunk or BranchesIncreasing Number of Dead BranchesAsh Bark BeetlesAsh Yellows PhytoplasmaBranch CankersClearwing BorersCoral Spot CankerEmerald Ash BorersEnvironmental StressFlatheaded BorersPerennial Nectria CankerRedheaded Ash BorerStem Girdling RootsAsh Bark Beetles Ash bark beetles Exit holes first appear in May in trunks and branches Exit holes are 1/8 inch wide and round Galleries…

Ash – Trunk or Branches – Holes in Trunk

Diagnosis – Ash Tree Problems on Trunk or BranchesHoles in TrunkAsh Bark BeetlesCarpenterwormsClearwing BorersEmerald Ash BorersFlatheaded BorersRedheaded Ash BorerWoodpeckersAsh Bark Beetles Ash bark beetles Exit holes first appear in May in trunks and branches Exit holes are 1/8 inch wide and round Galleries cut across the grain in sapwood; typically with two arms starting from…

Ash – Trunk and Branches – Sunken Spots on Trunk

Diagnosis – Ash Tree Problems on Trunk or BranchesSunken Circular or Irregular Spots on TrunkPerennial Nectria CankerSmooth PatchPerennial Nectria Canker Perennial Nectria canker or Neonectria ditissima Sunken round to oval cankers with target-shaped ridges of barkless wood on large branches or the main trunk A small dark sunken area on twigs that can girdle and…

Ash – Leaves – Holes or Tears

Diagnosis – Ash Tree Problems on LeavesHoles or TearsBlackhead Ash SawfliesCankerwormsCecropia CaterpillarsEmerald Ash BorersForest Tent CaterpillarsLinden LoopersPolyphemus CaterpillarsTiger Swallowtail CaterpillarsBlackhead Ash Sawflies Blackhead ash sawflies or Tethida barda Occurs May and June Chews leaf tissue starting at the tip and working its way back, leaving midveins Defoliation generally light to moderate, although can have potential…

Apple – Leaves – Holes in Leaves or Parts of Leaves Missing

Diagnosis – Apple Tree Problems on LeavesHoles in Leaves or Parts of Leaves MissingCankerwormsCecropiaEastern Tent CaterpillarFall WebwormForest Tent CaterpillarObliquebanded LeafrollerRedbanded LeafrollerRedhumped CaterpillarYellownecked CaterpillarCankerworms Cankerworms or Paleacrita vernata and Alsophila pometaria Chews smalls holes between veins at first, later chewing leaf tissue except for major veins, and eventually chewing all of the leaves except midvein Defoliation…