Flea beetles are a common pest on young tomato plants. They get their name by using their strong legs to jump, particularly when they are disturbed. While flea beetles are only about 1/16 to 1/8 inch in size, they cause the many small holes you are seeing on your plants leaves. Plants that are started from seed tend to have more problems with flea beetles than ones that are transplanted.

Damage to tomato plants is usually not serious unless the infestation becomes severe. A severe infestation can cause young tomato plants to be stunted or even die. Older, more established plants are better able to withstand flea beetle damage.

Because flea beetles overwinter in weeds, leaf debris, or the soil, it is important to control weeds and removed last year’s crop debris in your garden area. Be sure to rotate your crops, research has shown that planting tomatoes in the same place can greatly increase the chances of an infestation. Flea beetles can be vacuumed off, but you must continue to monitor for them as they can quickly return. Row covers can be used to screen out flea beetles. Be sure to remove row covers when your plants begin to flower, to allow them to be pollinated.

If you would like to use a chemical control, the following publication has more information on flea beetles and a list of chemicals for home use. It includes organic choices and be sure to carefully follow the instruction on the label. Pacific Northwest Handbook: Tomato - Flea Beetle