Semilunar whitefly

Systematic position of this insect places it within the Aleyrodidae family, order Hemiptera. Tetraleurodes semilunaris is a notable pest known for its specific morphological features and its ability to establish populations on a variety of host plants, often causing significant stress to plant health.

This species primarily targets ornamental plants and certain tropical crops. It is frequently identified on various Ficus species, citrus plants, and a wide array of indoor ornamental vegetation. Its ability to thrive in controlled environments makes it a persistent challenge for nursery and greenhouse management.

Biology and life cycle comprise several stages: egg, three larval instars, pupal stage, and the adult stage. The adult insects are distinct due to their darker wing coloration compared to common greenhouse whiteflies. Their reproduction rate is highly dependent on environmental conditions, particularly favoring warmth and reduced humidity.

Nature of damage and harmfulness is caused by the insects feeding on plant phloem sap. This leads to yellowing, leaf chlorosis, and reduced vigor. A critical secondary damage is the production of honeydew, which fosters the growth of sooty mold, preventing efficient photosynthesis and significantly decreasing the decorative or market value of the crop.

Control measures require an integrated approach (IPM). Key strategies include:

• Frequent monitoring using yellow sticky traps to detect early infestations.
• Pruning and removing heavily infested plant material to reduce local pest pressure.
• Application of systemic insecticides or contact-based acaricides/insecticides.
• Introduction of biological control agents such as predatory wasps or entomopathogenic fungi.