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Graphocephala fennahi

Rhododendron leafhopper

Description

Graphocephala fennahi, commonly known as the rhododendron leafhopper, is a monophagous insect associated exclusively with rhododendrons (Rhododendron ponticum). Native to the United States, it was introduced to Great Britain in the 1930s and later spread to continental Europe during the 1970s. This species feeds on plant sap and is believed to facilitate the spread of the fungal pathogen Pycnostysanus azaleae, which affects rhododendrons.

Adults are 8–10 mm long, displaying vibrant forewings with red and blue coloration and four distinct orange stripes. The lifecycle is univoltine, with eggs laid on rhododendron leaves in autumn and overwintering until spring. While G. fennahi causes only minor direct harm by sap-sucking, it can compromise the overall aesthetic appearance of rhododendrons through discoloration and the spread of fungal diseases. Intense infestations may lead to reduced vitality in host plants, particularly under stressed conditions.

Symptom

Feeding causes light-colored stippling or spotting on leaves. Affected areas may develop a silvery sheen and serve as entry points for fungal infections.

Tree Species: Rhododendron

Part of a plant- attacked: Leaf / Needle

Pest significance: Harmful

Pest Category: Insects

Invasive Species: Yes

Present in EU: Yes