Fork-tailed bush katydid

The fork-tailed bush katydid (Scudderia furcata) is an insect belonging to the order Orthoptera and the family Tettigoniidae. Native to North America, this species is well-known for its camouflage, as its bright green coloration and leaf-shaped wings allow it to blend perfectly with the foliage of trees and shrubs.

This species is considered a polyphagous pest, capable of feeding on a wide range of host plants. It frequently attacks fruit trees such as apple, pear, and citrus, as well as grapevines, vegetable crops, and ornamental shrubs. The katydid feeds primarily on foliage, though it can also cause significant damage to flowers and developing fruit during periods of high population density.

The biological cycle of this pest typically consists of a single generation per year. The insect overwinters in the egg stage, with females using their ovipositors to insert eggs into the edges of leaves or beneath the bark of young twigs. After hatching in the spring, the nymphs undergo several molts before reaching the adult stage, typically becoming most active throughout the summer and early autumn.

Damage caused by the fork-tailed bush katydid is characterized by ragged holes in leaves, often leading to partial or complete defoliation of the plant. In fruit orchards, the katydids may feed on the surface of young fruits, leaving behind scars that reduce market value and create entry points for fungal diseases. This damage weakens the plant's physiological vigor if the infestation is severe.

• Monitor vegetation for signs of irregular leaf margins and chewing marks.
• Implement proper sanitation by pruning and destroying infested twigs during the dormant season.
• Use biological control agents or targeted insecticides if populations exceed economic thresholds.
• Avoid night-time lighting near crops, as it attracts adult katydids.

Effective management requires regular scouting and the maintenance of garden hygiene. By removing old leaves and twigs that serve as egg-laying sites, growers can significantly reduce the local population. If chemical intervention is necessary, applying insecticides during the early nymphal stages is generally the most effective way to prevent widespread damage later in the season.