The flea beetle (family Chrysomelidae) is a pesky visitor to most gardens.The beetle targets tasty plants in the families Solanaceae (potatoes, tomatoes, eggplant, peppers) and Brassicaceae ( including cole crops: broccoli, kale, cabbage, collards). Most adult flea beetles are very small ranging in size from 1/16 –1/8 inch long. Flea beetles are most active during the warm period of the day when temperatures are 14°C (57°F) or above, and this is the best time to sample for adults. At this time, seedlings are being planted, too, and they are most susceptible to beetle damage. Plant susceptible crops as late as possible to avoid flea beetles, which are most active in early spring. There are many different species of flea beetles which feed on brassicas and these range in colour from shiny metallic black (turnip flea beetles, P. cruciferae, P. nigripes) to black with yellow stripes along each wing case (large striped flea beetle, P. nemorum). Flea beetles are more than just hole-boring pests. Adults are particularly active on calm, warm, sunny days. Some flea beetles have spots or stripes. Flea beetles become active in their full adult stage in the warm days of mid-spring (usually in the beginning of June). They can ruin a young crop in large numbers. This helps to remove the weeds and crop debris that provide a habitat for overwintering adults. They become active in spring and start eating the leaves of your plants when outdoor temperatures climb consistently to about 50ºF. Grape flea beetles overwinter as adults and become active on warm April days when grape buds begin to swell. They vary in color from black, bronze, bluish, or brown to metallic gray, while some species have stripes. Most of the damage caused by flea beetles are seen on the leaves and stems, which are small round, irregular shaped holes. No thresholds have been established. May 22, 2011. How to Kill Flea Beetles Naturally Once the crop reaches the 4-6 true leaf stage, it can usually outgrow the flea beetle feeding damage. They vary in color from black to metallic gray. Till the soil in fall or early spring. When disturbed, the beetles will spring away, similar to the behavior of a flea. Flea beetles overwinter as adults in the soil or beneath plant debris. During the growing season, if flea beetles have been active, cultivate the soil to destroy any larva. Adult flea beetles are particularly active on warm, calm, sunny days. It also determined significant associations between landscape structure and flea beetle abundance, weather and flea beetle abundance, and plant density and flea beetle damage. Flea beetle larvae range in size from less than 1 / 16 inch to approximately 3 / 16 inch in length, are worm-like, and white with a brown head. Most adult beetles are very small about 1/16 th-1/8 th inch long. Typical flea beetle damage and beetles on potato leaf. Full-grown larvae are 1/6 in. Following egg hatch, and small white larvae feed on the roots of the newly planted seedlings, causi… The adults have well developed hind legs which allow them to jump many times their own height when disturbed. Flea beetles seem to come out of know where, but that’s because they over winter in garden debris and come out in the spring when temperatures warm up. Danny has been monitoring these pests closely and found active larvae in early March. Spray can be effective on cool days, but not wet days. Every year, they cost growers millions of dollars in yield, and quality losses. The adults are 2-3 mm long and the larvae are white with a brown head and 3 pairs of legs and are 2.5 mm long. Larval stages feed on roots and tubers. Most flea beetle damage is caused by adult flea beetles and occurs as shallow pits and small rounded, irregular, holes in the foliage, cotyledons, and stems of host plants. 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