If a cloud of tiny white insects flies up when you disturb a plant, whiteflies are likely the cause.
What They Look Like
Whiteflies are very small, white insects that gather on the undersides of leaves.
They resemble tiny moths and will quickly scatter when plants are disturbed.
Immature stages remain attached to leaves and are not easily noticed.
They are often found in clusters in warm, protected areas of plants.
Damage Signs
Leaves may turn yellow or appear weak
Plants may become stunted or decline over time
Sticky residue (honeydew) appears on leaves and stems
Black sooty mold may develop on coated surfaces
Large populations may cause leaves to drop
Plants Affected
Tomatoes
Peppers
Eggplant
Cucumbers
Squash
Sweet potatoes
Brassicas
Fast Control (Start Here)
Spray plants with a strong stream of water, focusing on leaf undersides
Repeat regularly to disrupt populations
Act early when numbers are low
Focus on warm, sheltered areas where they gather
Additional Control Options
Use insecticidal soap on affected plants
Apply neem oil or horticultural oil to target multiple life stages
Use sticky traps to monitor and reduce adults
Repeat treatments as needed to control new hatch cycles
Prevention
Inspect plants frequently, especially leaf undersides
Keep plants healthy and well watered
Encourage beneficial insects such as lady beetles and parasitic wasps
Remove heavily infested leaves early
Check new plants before introducing them into the garden
Notes for Gardeners
Whiteflies thrive in hot, calm conditions
Populations can increase very quickly
You often notice them when they take flight before seeing them on leaves
Sticky residue is often the first clear sign of a problem
Controlling early is much easier than managing a heavy infestation
See Also
Garden Pest Identification Guide (The Dirty Dozen)
Common Tomato Pests
Managing Pests In Hot Weather
