Pest description and crop damage Campylomma is Asian or European in origin. Adults are brownish-yellow and about 0.1 inch long, very mobile and active. Nymphs are small, green, and fast moving and about 0.1 inch long when mature. The mature nymphs resemble aphids in some ways but are far more active. Feeding by nymphs causes dimpling and distortion of fruit.
Biology and life history Campylomma has two types of hosts, either a woody host, or an herbaceous one. The woody host appears to be essential for development of the insect but the herbaceous host is not as important. Woody hosts include apple and pear as well as serviceberry, grape and wild rose. Herbaceous hosts include common mullein, a preferred host, as well as weeds and various crop plants like potato, sugar beet, corn and small grains. Campylomma overwinters as eggs in bark on the woody host. The eggs begin to hatch prior to bloom. The nymphs feed on woody hosts through the bloom period until late spring, then move to herbaceous host plants. Campylomma is one of the only fruit tree pests to also be considered a beneficial insect: later in the growing season, the bugs prey on aphids and pear psylla, and can substantially reduce populations of these pests. Adults mate and lay eggs in the bark of woody host plants.
Scouting and thresholds Nymphs and adults may be monitored by limb tapping from the pink stage through petal fall.
Management-chemical control: HOME USE
There are no products specifically registered for control of Campylomma in apple.
Management-chemical control: COMMERCIAL USE
Stages 5-6: Pink spray
- acetamiprid (Assail 70WP) at 1.7 to 3.4 oz/a in up to 100 gal water per application. Do not make more than 4 applications per year or exceed 13.5 oz/a per growing season. PHI 7 days.[Group 4A]
- diazinon (Diazinon 50W) at 2 to 4 lb/a in up to 100 gal of water per application. Do not apply more than 12 lb/a per growing season. Do not apply more than two applications per acre per year. The minimum treatment interval is 14 days. See label for use restrictions. PHI 21 days. [Group 1B]
- thiamethoxam (Actara) at 4.5 oz/a in a minimum of 50 gal water per application. PHI 35 days. [Group 4A]