Which tactic is the most appropriate for managing whiteflies in a greenhouse?

• A. Yellow Sticky Traps
• B. Beneficial Nematodes
• C. Reflective Mulches
• D. Pruning Leaves

Answer: (A)

Targeting the flying stage of whiteflies with yellow sticky traps is the most effective first-line tactic in a greenhouse. These traps attract adult whiteflies, capture them, and thereby reduce mating and egg-laying while giving you a quick read on pest pressure. They are non-toxic, inexpensive, and easy to deploy, making them ideal for regular monitoring and timely decisions about further controls. By reducing the number of adults, traps help slow population growth and provide ongoing feedback to guide interventions such as releasing beneficials or applying selective controls.

Beneficial nematodes target soil-dwelling stages and are not effective against the above-ground whiteflies on leaves, so they won’t provide meaningful control here. Reflective mulches can deter some whiteflies in certain setups but are less practical and reliable in a greenhouse environment. Pruning leaves may remove some infested tissue but is labor-intensive, can stress plants, and does not address the continuous production of new whiteflies on the foliage.