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INSECT AND MITE PESTS
The several leafhopper adults will have various color patterns, however, generally they are small insects, long and slender, with a convex shaped back. Generally with bright blue, white and crimson color patterns. Juveniles are generally light green, wingless and "scurry" around by sideways and backward movements.
Damage is caused by nymphs and adults removing chlorophyll and sap from leaves. Whitish spots or stippling on upper leaf surface are evidence of feeding.
All of these leafhoppers have similar life cycles consisting of egg, several nymphal stages (juveniles) and the adult. However, the stage which overwinters is different. The white apple, rose and apple leafhoppers overwinter in the egg stage.
The Oblique-striped apple leafhopper overwinters in the adult stage. The Potato leafhopper overwinters only in the south and infests orchards of the northcentral and northeastern areas by annual migration.
SCOUT: Select 100 leaves per tree. Examine the undersides of leaves near midrib and other major veins for nymphs. When high numbers are encountered, stop counting at 300 leafhoppers.
RECORD: The total number of leafhopper adults and nymphs present per 100 leaves.
ACTION THRESHOLD: An average of three adults and nymphs/leaf (300 leafhoppers per 100 leaves).
Apple IPM web site created by Kerry Kirk - 2001 - Maintained by Pat Dillon