Alder spittlebug

Systematic position: The Alder spittlebug (Aphrophora permutata) belongs to the order Hemiptera and the family Aphrophoridae. Despite its name, it is a significant pest of various woody species, including conifers, which makes it a notable subject in entomological and forestry studies.

Host plants: This pest primarily infests coniferous species such as pine and spruce. Occasionally, it may be found on various shrubs and deciduous trees, utilizing them for feeding and egg-laying, which can lead to localized damage in forest nurseries and residential landscaping.

Biology and life cycle: The life cycle is characterized by incomplete metamorphosis. Eggs are typically laid within the plant tissue or bark, where they overwinter. In the spring, nymphs emerge and start producing the characteristic froth or "spittle," which protects them from predators and desiccation. Adults emerge in early summer, characterized by their strong jumping ability and mobility.

Damage and harmfulness: The damage is caused by both nymphs and adults piercing plant tissues to extract sap. This feeding process causes shoot distortion, stunted growth, and yellowing of the foliage. Heavy infestations can lead to significant stress on the host plant, weakening its natural defenses and potentially causing twig dieback.

• Apply systemic insecticides during the nymphal stage before the froth becomes too dense.
• Prune and destroy heavily infested branches to reduce local pest population.
• Ensure trees remain well-hydrated to improve their resilience to sap-feeding insects.
• Implement regular scouting programs during late spring to identify the early signs of spittle masses.