Chitinous whitefly

Systematic position. The chitinous whitefly (Dialeurodes chitinosa) belongs to the order Hemiptera and the family Aleyrodidae. It is a recognized pest in various subtropical and tropical agricultural regions, known for its specific host range and resilience against environmental stressors.

Host plants. This species primarily infests plants of the family Rutaceae. It is a significant pest of citrus trees, including lemon, orange, and mandarin. The pest is frequently found on the underside of leaves, where it colonizes host tissues to feed on plant sap throughout the growing season.

Biology and life cycle. The life cycle consists of the egg stage, three larval instars, the pupal stage, and the adult stage. The name "chitinous" refers to the highly developed, sclerotized cuticle of the larval stages, which provides protection against desiccation and many topical chemical applications, making this pest particularly difficult to manage.

Damage patterns and economic importance. Feeding by the larvae leads to direct depletion of plant nutrients, causing chlorosis, leaf deformation, and reduced plant vigor. Furthermore, the excretion of honeydew promotes the growth of sooty mold, which coats the leaves, inhibits photosynthesis, and compromises the aesthetic and commercial value of the harvested fruit.

Protection measures. Effective control requires an Integrated Pest Management (IPM) strategy. Key methods include

• monitoring insect populations with yellow sticky traps;
• applying systemic insecticides during the peak of larval activity;
• pruning to improve canopy air circulation;
• utilizing biological control agents such as parasitic wasps.