Pine Tree Yellowing Needles and White Sudsy Substance: Insect Identification

Eastern white pines in central Maine show yellowing/browning needles on lower branches and white frothy material on some branches. Grayish bark patches are likely harmless lichens. The white substance suggests insects: pine needle scale or adelgids.

Identifying the Culprit

Pine needle scale: Look for tiny, white, oyster-shell-shaped bumps on needles. Adelgids: Produce woolly or frothy secretions on needles, twigs, or bark. Compare symptoms to provided fact sheets from MSU and OSU extensions.

Management Approach

Natural predators often control these pests. If treatment is needed, horticultural oil or insecticidal soap applied during crawler stage (spring) is effective. Confirm identification with local extension before treating. Maintain tree vigor with watering during dry periods.