Chapter 21

Managing Vineyard Insect and Mite Pests

Green June Beetle

Green June beetle (Cotinis nitida) is a serious pest most commonly found in southern vineyards, although this native beetle can be found from Connecticut south to Florida and as far west as Texas and Oklahoma.

Symptoms

Green June beetle is a serious pest of grapes feeding on petioles, leaves, and berries (See Figure 21.18). Green June beetle is attracted to the ripening clusters as the berries soften and the sugar content increases. As the beetles feed, they emit pheromones, which attract other green June beetles.

Life Cycle

The larvae overwinter just below the soil surface. In the spring, they tunnel near the soil surface, pupate and emerge as adults in the summer months feeding on leaves and berries. Adult populations usually peak with grape berry maturation.

Monitoring

Management of green June beetle requires frequent scouting to detect its presence in the vineyard at the time they are most active. Traps are available for monitoring green June beetle though not too effective, but still can be used to indicate initial adult emergence.

Pest Management

Cultural Practices

Growers might consider burying the pupae by mounding soil up under the vines early in the season.

Applying Control Materials

Green June beetles are most abundant in the vineyard from when winegrapes are high in accumulated sugars and until grapes are harvested. However, the products that are effective against these pests have required pre-harvest intervals (REIs) that prohibit their use in the final few days before harvest.

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