Monitoring and Thresholds. Grape phylloxera (leaf form) Control the root gall form of grape phylloxera by using rootstocks derived from American grapes. •Insecticides will reduce adult populations. 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”. I do not recommend soap to control beetles as they have tough shells. Cultural control is the key to killing flea beetles. Climbing cutworm injury: larvae feed at night, not visible during the day . Chapter 22 Managing Vineyard Insect and Mite Pests Grape Flea Beetle. Remove all old debris from the previous crops and prevent weeds, which are an important early season food for flea beetle larvae. Rose chafer, Flea beetle larvae, Redbanded leafroller: Same as for 4- to 10-inch shoot spray (if needed) ... Grape root borer control will affect use of Lorsban for other pests. The insect overwinters as an adult. Adult beetles and larvae also feed on leaves, but the injury they cause usually is negligible. It may jump when disturbed. ), 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. Adults eat buds and unfolding leaves, causing leaves to be ragged and tattered. They start to emerge at bud swell. Adult flea beetles cause two types of damage—feeding directly on the buds and feeding on the foliage (See Figure 22.6). Biology Grape flea beetle overwinters as an adult. •If vineyards were infested with flea beetle populations last year, they should be monitored this spring for the presence of larvae. Despite good cultural practices, pests and diseases at times may appear. The grape flea beetle (Altica spp. Larvae are yellow-brown with a dark head and feed on clusters and leaf surfaces. •Control is typically not recommended unless damage is severe on mature vines. Grape Flea Beetle. flea beetle populations. Chemical control should be used only after all Grape flea beetle bud damage is usually found in vineyard borders near woody areas, where monitoring should be prioritized. The brown, black-spotted larvae of the grape flea beetle will skeletonize the leaves and eat the flower clusters, too. Without cover and food supplies, the larva will starve. Larvae hatch and crawl to the developing grape leaves, where they feed on the upper surfaces. The greatest injury occurs during prolonged cool springs with slow bud growth. Larvae feed on flower clusters and skeletonize leaves in a manner similar to adult rootworm feeding. Once the buds reach 25 mm (1”) flea beetle damage is usually not significant. Grape flea beetle is found in the eastern two-thirds of the United states. The grape flea beetle (or steely beetle) is a shiny, metallic dark blue. A more effective alternative is spraying with a pyrethrin compound or dusting with a diatomaceous earth. 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. Proper timing of the insecticide is important to provide good control of grape flea beetles. During their spring feeding, grape flea beetle females lay their eggs on the canes and later die. The larvae overwinter in soil and can be destroyed during regular hoeing and cultivating. Female beetles lay eggs mainly under loose bark of the grapevine. Newly hatched larvae of the grape flea beetle are dark brown and approximately 1/16-inch long. At the time larvae and beetles are feeding on the upper surface of grape leaves, they are easily controlled by spraying. More information on Grape flea beetles •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. 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