| 2-MARKED TREEHOPPER,
ENCHENOPA BINOTATA (SAY)
The 2-marked treehopper is a
small, darkbrown insect with two yellow spots on the center of its back. It has
a thorn-like projection over the head and jumps when disturbed. Adults are
approximately 1/4 inch long. The nymphs are black with white markings and often
have spinelike structures extending from their abdomens. Treehoppers are widely
distributed throughout eastern United States.
Both adults and nymphs
suck sap from walnut leaves. Often they can be seen feeding on the lower leaf
surface or on the leaf rachis. Although they may be abundant within a
plantation, their feeding habits do not appear to cause serious damage.
However, female adults can damage twigs when they deposit eggs into small slits
made by their ovipositors. After the eggs are laid the female covers them with
a white frothy "plug" that later turns brown. After the eggs hatch, the slits
remain evident as scars for several years. Treehoppers are present on walnut
trees throughout the growing season.
Control is usually