Round buffalo treehopper

The Round buffalo treehopper (Stictocephala rotundata) belongs to the order Hemiptera and the family Membracidae. It is recognized by its enlarged pronotum, which often extends over the abdomen, providing a unique shape that mimics plant thorns. This insect is a sap-sucking pest that utilizes its specialized mouthparts to extract nutrients directly from the phloem of host plants.

This pest primarily affects a variety of fruit-bearing trees and ornamental shrubs. Key agricultural hosts include apple, pear, peach, and plum trees. It is particularly damaging in nurseries and young orchards, where the young stems are soft enough for females to insert their eggs, causing significant stress to developing plants and reducing their overall vigor.

The life cycle of this treehopper includes the egg stage, five nymphal instars, and the adult stage. The species typically overwinters as eggs embedded within the bark of twigs. In the spring, nymphs emerge and begin feeding on succulent plant tissues. After completing their development throughout the summer, adults emerge to mate and lay eggs, continuing the cycle for the next season.

The primary damage caused by Stictocephala rotundata is twofold. First, the extraction of plant sap weakens the tree. Second, and more importantly, the egg-laying process causes deep lacerations in the bark. These wounds serve as entry points for various pathogens, including fungi and bacteria, which can lead to localized bark necrosis, branch dieback, and stunted tree growth.

Effective management and control measures should focus on the following strategies:

• Pruning and destroying infested twigs during the dormant season to remove overwintering eggs.
• Controlling weeds and tall grasses in and around the orchard to disrupt the habitat of the nymphs.
• Applying systemic insecticides during the peak period of nymph emergence in early spring.
• Maintaining tree health through proper irrigation and fertilization to help the trees withstand infestations.
• Monitoring the orchard population using visual inspections to determine the need for chemical intervention.