Chapter 21

Managing Vineyard Insect and Mite Pests

Multicolored Asian Lady Beetle

The multicolored Asian lady beetle (Harmonia axyridis) is native to Asia but occurs throughout the Eastern United States and Southern Canada.

Symptoms

Beetles do not cause physical damage to grape bunches but will feed as a secondary pest after berry splitting or after bunch breakdown caused by Botrytis bunch rot, bird damage or grape berry moth (See Figure 21.20).

Life Cycle

Eggs are laid in clusters on the underside of leaves near aphid colonies. Aphids are the primary source of food for the beetle.

Monitoring

Early detection of movement of populations into vineyards can be accomplished by using yellow sticky traps.

Pest Management

Cultural Practices

One approach in controlling these beetles is to minimize fungal diseases and pest infestation of grape clusters.

Insecticides

Even though these beetles are observed in vineyards throughout the growing season, chemical control measures are not justified until 1 to 2 weeks before harvest.

Applying Control Materials

Even though these beetles are observed in vineyards throughout the growing season, chemical control measures are not justified until 1 to 2 weeks before harvest. Early season control is not justified because adult beetles cannot directly damage, or penetrate grape skins. Typically, they feed on berries that have been previously damaged by other insects, birds, diseases, or by “splitting.”

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