- Brassica Pests
- Legume Pests
- Corn Pests
- Solanaceae Pests
- Leafy Greens Pests
- Cucurbit Pests
- Potato Pests
- Root Crops Pests
- Hemp Pests
White Fly Adult
White Fly Adults
(Whitney Cranshaw, Colorado State University, Bugwood.org)
White Fly Nymphs
(John A. Weidhass, Virginia Polytechnic Institute and State University, Bugwood.org)
- Greenhouse/High Tunnel Crops
- Solanaceae Crops
- Leafy Greens
- Root Crops
Adults are tiny with bright white wings and yellow-orange heads. Immature stages are inconspicuous with pale, almost translucent, flat bodies that are mostly immobile.
BIOLOGYWhitefly populations continue from year to year in greenhouses and in the far south. There are several generations per year. During warm weather, on transplants, or when natural enemies are disrupted by insecticide applications, dusty conditions, or interference with ants that are attracted to the honeydew secreted by whiteflies.
Egg | Nymph | Pupa | Adult
- Several generations per year.
- Populations continue from year to
year in greenhouses and in warm
Adults and nymphs feed with piercing-sucking mouthparts, causing leaves to turn yellow, appear dry, or fall off plants. Whiteflies, like aphids, also excrete a sugary substance called honeydew, causing shiny, sticky leaves or sooty mold growth on leaves.
- Attract and conserve natural enemies
as they often provide adequate
- Inspect transplants and remove any
with high whitefly populations.
- In greenhouses, use biocontrol (such
as hanging cards with Encarsia sp.).
- Approved insecticides are available.
weather and on transplants.
When and Where to Scout: In the greenhouse, monitor with yellow sticky cards to detect whitefly presence. Look for large colonies during warm weather on the underside of lower leaves. Honeydew may also be noticeable on the tops of leaves. Before planting, inspect transplants for whiteflies.
Threat Level: High for greenhousegrown hemp.
Occurrence in Utah: Whiteflies have not yet been found feeding on field-grown hemp in Utah, but whitefly damage has been found in neighboring states. Economic damage from whiteflies in the garden or field is rare in Utah and is more commonly seen in greenhouses or high tunnels.
Whiteflies develop resistance to insecticides quickly and treatment is not generally needed for garden plants in Utah. Greenhouse plants have a threshold of 10 nymphs/leaf.