Sycamore antracnose symptoms on foliage.
Landscape
Sycamore anthracnose causes tiny cankers around buds or on twigs.
Powdery mildew on rose.
Powdery mildew on Norway maple.
Powdery mildew on honeysuckle.
Maple anthracnose infections start out as pale olive in color, and tend to follow the leaf veins.
Elm leafminer adult, laying her eggs inside the leaf tissue.
Elm leafminer larva seen inside a mine.
European elm flea weevil adults chew holes in leaves.
European elm sawfly larvae feed communally, and when disturbed, lift their back sides as a defensive measure.
A single caterpillar causes a large mass of pitch.
Pitch mass borers feed on pine resin, and do not bore into the tree. But bad infestations do cause the tree to spend energy producing the large amounts of sap...
The pitch mass borer most commonly found in Utah is the sequoia pitch moth.
Lilac ash borer exit holes are easily visible, and perfectly round.
Lilac-ash borers can attack lilacs, causing dieback.