Glassy-winged sharpshooter

📖Overview

Homalodisca vitripennis, commonly called the glassy-winged sharpshooter (GWSS), is a relatively large leafhopper native to the southeastern United States and northeastern Mexico and now established in parts of California and other regions through accidental human transport. Adults are active during warm months and feed on xylem sap from a wide range of woody and herbaceous plants. While the insect itself is harmless to people, it is a major agricultural pest because it efficiently acquires and transmits the bacterium Xylella fastidiosa, which causes diseases such as Pierce's disease in grapevines and leaf scorch in many ornamental and crop plants.

The species is polyphagous (feeds from many host plants), has multiple generations per year in warm climates, and lays eggs in masses inserted into plant tissue. Natural enemies, including egg parasitoid wasps, predators and entomopathogenic fungi, can reduce populations but are often insufficient where the insect is invasive. Management focuses on monitoring, cultural controls, biological control agents, and targeted insecticide use when necessary to protect high-value crops.

🔍How to identify a glassy-winged sharpshooter

Adults are stout, about 12-14 mm long, with a broad head and translucent forewings with reddish veins that give a glassy look. The body is dark brown to nearly black, with ivory to yellowish spots on the head and thorax. The wings extend beyond the abdomen when at rest. Nymphs are wingless when young, pale grey to olive, and become larger through instars; older nymphs develop wing pads. Eggs are laid in rows inside plant tissue, and females often cover the egg site with white chalky particles (brochosomes) carried on their forewings.

1. Large leafhopper 12-20 mm long with broad translucent forewings that extend beyond the abdomen
2. Overall brown to olive body with subtle blue-green sheen and darker head/pronotum markings
3. When disturbed, adults jump strongly and fly; nymphs are wingless and smaller with pale to greenish coloration
4. Egg masses are inserted into plant tissue in overlapping rows

Lookalikes

↻Life cycle

1. 🥚

   Egg

   Eggs are laid in masses inserted into plant tissue, often in rows beneath the leaf surface. Eggs hatch in about 1-3 weeks depending on temperature.

2. 🐞

   Nymph

   Several nymphal instars are wingless and feed actively on xylem sap. Nymphs develop over several weeks, growing rapidly in warm conditions.

3. 🐞

   Adult

   Adults have fully formed wings, disperse by flying and hopping, and transmit Xylella fastidiosa between plants while feeding.

🍃Diet and predators

🌱Effect on plants and gardens

Feeds on xylem sap from many plants (grapevines, citrus, oleander, palms, oaks and many ornamentals). Direct feeding can cause minor stress, but the major impact is transmitting Xylella fastidiosa, which causes severe diseases like Pierce's disease in grapes and leaf scorch in ornamentals and shade trees.

How to get rid of glassy-winged sharpshooters

Integrated approaches work best: monitor with yellow sticky traps and visual inspection; remove or manage preferred host plants near vineyards and orchards (e.g., weedy growth and ornamentals like oleander); conserve or introduce natural enemies (egg parasitoid wasps such as Gonatocerus spp.); use targeted insecticides or systemic treatments when economic thresholds are reached; and implement quarantine and sanitation to limit spread. Follow local agricultural guidelines for chemical and biological controls.

📍Where and when to find it

Adults on leaves and stems of host plants (oleander, citrus, grapevines, oaks, ornamentals). Look for nymphs on the underside of leaves and egg masses inserted into stems or leaf petioles.

✨Fun facts

• Despite the name 'glassy-winged', the wings are translucent and show visible veins, giving a glass-like look.
• GWSS was accidentally introduced to California and became a major concern because it spread Xylella fastidiosa to vineyards.
• Scientists use egg parasitoid wasps (Gonatocerus species) as classical biological control agents against GWSS.

?Frequently asked questions

📷Photos of the glassy-winged sharpshooter