Giant whitefly

Systematic position: Aleurodicus dugesii belongs to the order Hemiptera and the family Aleyrodidae. Known commonly as the giant whitefly, this species is a significant invasive pest that has spread globally through the international trade of ornamental nursery stock, particularly affecting subtropical and tropical plant species.

Host plants: The pest is a highly polyphagous insect, capable of feeding on a wide variety of hosts. Common targets include ornamental plants like hibiscus, ficus, and magnolia, as well as various fruit trees. Its ability to thrive on diverse plant species makes it a persistent challenge for both professional nurseries and home gardeners.

Biology and life cycle: The life cycle progresses through eggs, four larval instars (nymphs), and adults. The nymphs are particularly distinct due to the production of long, waxy filaments that give the infested leaves a cottony appearance. High reproductive rates allow the population to explode, especially in warm and humid climates where development continues throughout the year.

Damage and severity: By feeding on plant phloem, Aleurodicus dugesii causes leaf yellowing, stunting, and premature abscission. Furthermore, the excretion of copious amounts of honeydew promotes the growth of sooty mold, which severely reduces the photosynthetic capacity of the leaves and diminishes the aesthetic value of ornamental plants.

Control measures: Management strategies emphasize early detection using sticky traps and periodic inspection of the leaf undersides. Chemical control involving systemic insecticides is often necessary for severe infestations. Additionally, biological control programs utilizing natural enemies, such as Encarsia or Nephaspis species, are effective for suppressing populations in greenhouses and landscapes.