Buffalo treehopper

The buffalo treehopper (Stictocephala inermis) is a member of the Membracidae family, belonging to the order Hemiptera. Adult insects reach 8–10 mm in length and feature a unique pronotum that extends over the body, giving them a distinctive "buffalo-like" appearance.

Their coloration ranges from light green to olive, providing excellent camouflage against foliage. The pronotum is highly developed with lateral projections, which are key identification features of this specific species.

Nymphs are wingless and characterized by spiny outgrowths along their backs. They are relatively sedentary compared to adults, typically remaining on the lower parts of host plants during their development stage.

The species is univoltine, completing only one generation per year. They survive the winter in the egg stage, which are deposited directly into the bark of young twigs by the female.

Females possess a saw-like ovipositor used to make specific slits in the host plant's wood. These eggs are laid in clusters, often arranged in a fan-like pattern under the bark surface.

The buffalo treehopper primarily attacks young fruit trees such as apple, pear, plum, and cherry, as well as various ornamental shrubs. Both adults and nymphs feed by piercing the plant tissue and sucking the sap.

The most significant damage occurs when females lay their eggs. By cutting into the bark, they disrupt the cambium layer, creating deep wounds that can restrict the growth and development of the young shoot.

These bark injuries serve as entry points for pathogens, potentially leading to fungal infections, cankers, and bacterial diseases that weaken the tree's overall structural integrity.

Severe infestations can lead to stunted growth, deformed branches, and an overall reduction in the cold hardiness of young saplings. In nurseries, this pest can cause substantial economic losses.

Over time, the affected branches may show signs of cracking or necrotic tissue, which hampers nutrient transport and can result in the partial or total dieback of the branch.

Nymphs emerge from their overwintering eggs in the spring, typically around May when buds begin to swell. They initially feed on the sap of weeds in the orchard understory before moving onto trees.

The nymphal stage lasts approximately six weeks. By early summer, these transition into mobile adults, which are the primary reproductive stage of the insect’s life cycle.

Adult activity peaks during the late summer, specifically from July through September. During this time, they move actively between trees and engage in mating and egg-laying processes.

Because they are capable of jumping and flying, treehoppers can quickly spread throughout an orchard, making them difficult to contain once the population reaches a certain threshold.

As autumn progresses and temperatures drop, adult treehoppers die off, leaving the next generation protected inside the bark of the trees until the following spring.

The most recognizable sign of infestation is the presence of paired crescent-shaped slits in the bark of young twigs. These marks are often accompanied by slight swelling or callus tissue around the site.

Visible symptoms on foliage may include yellowing, curling, or overall poor vigor of the tree, which often goes unnoticed until significant bark damage has already occurred.

The presence of dense weed growth, particularly broad-leaved species in the orchard floor, is a strong indicator that the habitat is suitable for treehopper development.

If you notice young branches that look "scarred" or have rough, broken bark without any other obvious cause, it is likely the result of past buffalo treehopper oviposition.

During the summer months, look for the insects themselves on the underside of leaves or branches; while camouflaged, they may be disturbed and jump when the plant is shaken.

Effective management begins with strict sanitation. Removing broad-leaved weeds in and around the orchard is essential to eliminate the primary food source for nymphs during their early development.

Pruning out and disposing of infested twigs during the dormant season is a highly effective mechanical method to reduce the overwintering population of the pest.

Maintaining a clean orchard floor through regular mowing or cultivation helps disrupt the treehopper's habitat and reduces their ability to complete their life cycle successfully.

In cases of severe infestation, systemic insecticides applied during the peak emergence of nymphs or before the egg-laying period can provide temporary suppression of the population.

• Prune and burn damaged twigs during winter.
• Maintain a weed-free zone around young trees.
• Monitor for adult activity and use targeted insecticide sprays if necessary.