Three-cornered alfalfa hopper

The Three-cornered alfalfa hopper (scientific name Spissistilus festinus) is a small insect belonging to the Membracidae family. It is easily identifiable by its triangular, humpbacked appearance, which provides excellent camouflage among foliage. These insects are prolific jumpers and can quickly disperse across agricultural landscapes.

This pest has a broad host range, feeding on many legumes, most notably alfalfa, as well as woody ornamental and fruit-bearing trees. While they can feed on various crops, their impact is most severe when they aggregate in fruit orchards, where they cause structural damage to young growth.

The life cycle involves overwintering in the egg stage, embedded within the bark of host trees. After hatching in the spring, nymphs drop to the ground to feed on herbaceous weeds and legumes. Once they reach maturity, the winged adults migrate back to trees to mate and lay their next generation of eggs, completing the annual cycle.

The most significant economic damage occurs when females insert their eggs into the bark of young twigs. They create a characteristic series of slits that girdle the stem. This disrupts the flow of water and nutrients, resulting in the death of the branch distal to the injury, stunted growth, and increased susceptibility to secondary fungal pathogens.

Integrated Pest Management strategies for this insect include:

• Removing and destroying infested plant material during the dormant season.
• Maintaining clean fields by managing legumes and broadleaf weeds that host the nymphs.
• Monitoring adult populations using yellow sticky traps during migration periods.
• Targeted application of insecticides only when economic thresholds are reached.