Psyllid Pest

Psyllids, commonly known as jumping plant lice, are small, sap-sucking insects belonging to the superfamily *Psylloidea* under the order *Hemiptera*. These active plant pests are major agricultural threats across multiple crop families, particularly the Asian Citrus Psyllid (*Diaphorina citri*) and pear psylla (*Cacopsylla pyricola*). By feeding on phloem sap from tender leaves, shoots, and buds, psyllids stunt plant growth, cause foliar distortion, and excrete sticky honeydew. Crucially, they serve as principal vectors for devastating systemic plant diseases, such as Citrus Greening (Huanglongbing), making control imperative.

Identifying psyllids is aided by their distinct feeding posture and insect anatomy. Adults are tiny (2–4 mm long) with clear, roof-like wings held over their bodies. They sit at a characteristic 45-degree angle on stems while feeding. Nymphs are flat, yellowish-green, and produce distinct white, waxy curly tubules or threads of honeydew to prevent drowning in their own sugar excretions. Severe symptoms on foliage include leaf curling, yellowing, shoot dieback, and the growth of black sooty mold on sticky leaves.

Psyllids damage key citrus cultivars, stone fruits, and solanaceous crops.

Management relies on monitoring flight activity using yellow sticky traps and encouraging natural predators like ladybugs, hoverflies, and lacewings. Organic controls include foliar neem oil, insecticidal soaps, and kaolin clay barriers to deter feeding. Chemical control relies on systemic insecticides like imidacloprid or contact sprays like spinetoram. For details on specific species dossiers, explore our guide on the Asian Citrus Psyllid, or visit our Plant Disease Identifier Hub and related sucking pest profiles like Citrus Greening, Citrus Canker, and Scale Insect.