Grape Flea Beetle. Without cover and food supplies, the larva will starve. Cultural control is the key to killing flea beetles. If flea beetles are a chronic problem it may be necessary to target adults and larvae later in the season. Monitoring and Thresholds. Climbing cutworm injury: larvae feed at night, not visible during the day . flea beetle populations. Despite good cultural practices, pests and diseases at times may appear. A more effective alternative is spraying with a pyrethrin compound or dusting with a diatomaceous earth. Flea beetles that develop in the soil as larvae often can produce 2 or 3 generations a season, such as the “cabbage flea beetles” and the “potato flea beetles”. More information on Grape flea beetles They start to emerge at bud swell. If grape flea beetles are a pest on your grapevines, contact the UConn Home & Garden Education Center (877) 486-6271 (toll-free in CT) for recommended control materials and application times. The insect overwinters as an adult. Grape phylloxera (leaf form) Control the root gall form of grape phylloxera by using rootstocks derived from American grapes. I do not recommend soap to control beetles as they have tough shells. At the time larvae and beetles are feeding on the upper surface of grape leaves, they are easily controlled by spraying. The brown, black-spotted larvae of the grape flea beetle will skeletonize the leaves and eat the flower clusters, too. Female beetles lay eggs mainly under loose bark of the grapevine. During their spring feeding, grape flea beetle females lay their eggs on the canes and later die. Adults eat buds and unfolding leaves, causing leaves to be ragged and tattered. Larvae feed on flower clusters and skeletonize leaves in a manner similar to adult rootworm feeding. Grape flea beetle bud damage is usually found in vineyard borders near woody areas, where monitoring should be prioritized. Newly hatched larvae of the grape flea beetle are dark brown and approximately 1/16-inch long. Adult flea beetles cause two types of damage—feeding directly on the buds and feeding on the foliage (See Figure 22.6). The grape flea beetle (Altica spp. Remove all old debris from the previous crops and prevent weeds, which are an important early season food for flea beetle larvae. Exceptions include larvae of the tuber flea beetle, which can cause scarring of potato tubers, and larvae of flea beetles that feed on leafy spurge. It may jump when disturbed. Grape flea beetle is found in the eastern two-thirds of the United states. •Control is typically not recommended unless damage is severe on mature vines. •If vineyards were infested with flea beetle populations last year, they should be monitored this spring for the presence of larvae. Larvae are yellow-brown with a dark head and feed on clusters and leaf surfaces. The larvae overwinter in soil and can be destroyed during regular hoeing and cultivating. •Control is more important in newly-established vineyards. Insecticides: In particularly heavy infestations, if more than 4% of grape buds are infested, spray an application of carbaryl, esfenvalerate or pyrethrin to reduce grape flea beetles. Larvae hatch and crawl to the developing grape leaves, where they feed on the upper surfaces. Proper timing of the insecticide is important to provide good control of grape flea beetles. The greatest injury occurs during prolonged cool springs with slow bud growth. The grape flea beetle (or steely beetle) is a shiny, metallic dark blue. Once the buds reach 25 mm (1”) flea beetle damage is usually not significant. Chemical control should be used only after all ), also known as the steely beetle, is a native insect and occurs in almost all states east of the Rocky Mountains and in Canada.Symptoms. 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