WSU Extension programs and employment are available to all without discrimination. Evidence of noncompliance may be reported through your local Extension office.
Beet, Chard: Beet or spinach leafminer
categories: Beet, Chard Beet, Chard Insects Vegetables
revision date: 2023-01-04 12:00
Photo by: A.L. Antonelli
Biology
The beet or spinach leafminer is the larva of a small (1⁄4″) gray fly with black hairs. Eggs are laid on the leaves of beets, chard, spinach, and weeds including lambsquarters. The emerging maggots mine between the upper and lower surfaces of the leaf, forming narrow mines which later enlarge into pale blotches. Damaged leaves are distorted. The white larvae are about 1⁄4″ long when mature. They emerge from the leaves and pupate in the soil.
Management Options
Use Integrated Pest Management (IPM) for successful plant problem management.
Non-chemical Management
Select non-chemical management options as your first choice!
- Control weeds in and around the garden.
- Rotate crops. Do not replant where crops were infested the previous year.
- Pinch leaves to kill larvae inside.
- Pick out infested leaves when noticed. Discard leaves in garbage.
- Screen plants with a floating row cover prior to emergence of flies in spring (April-May).
Chemical Management
IMPORTANT: Visit Home and Garden Fact Sheets for more information on using pesticides.
- None recommended.
WSU Extension programs and employment are available to all without discrimination.
Evidence of noncompliance may be reported through your local Extension office.