Agriculture: Grape Pest Management Guidelines

Véraison

This year-round program section covers the major pests of table grapes grown in California. For wine and raisin grapes, see WINE AND RAISIN GRAPE YEAR-ROUND PROGRAM.

About Véraison

What should you be doing during this time?

Monitor leafhoppers, spider mites, and mealybugs weekly. Keep records (example monitoring form PDF). Manage if needed according to the Pest Management Guidelines.

Continue checking pheromone traps weekly for omnivorous leafroller. Keep records (example monitoring form PDF).

Inspect vines for grape mealybug and vine mealybug. Educate field crew to identify and mark vine infestations for treatment. Manage if needed according to the Pest Management Guidelines.

Monitor sticky traps for glassy-winged sharpshooter. Keep records (example monitoring form PDF).

Mark locations of vines with poor growth for future confirmation and management of abiotic disorders or pests:

  • Pierce's disease
  • Phylloxera
  • Nematodes

Monitor for Botrytis bunch rot, powdery mildew, and summer bunch rot. Hedge canopy to increase air movement and reduce humidity in the fruit zone. Manage if needed according to the Pest Management Guidelines.

Monitor caterpillars if they have been a problem in the past:

  • Omnivorous leafroller
  • Grape leaffolder
  • Western grapeleaf skeletonizer

Keep records (example monitoring form PDF).

If necessary, manage birds with netting or scare devices as fruit ripens.

Remove weeds that have escaped treatment before they set seed.

Consider the use of plastic vine covers for late harvest varieties, which are susceptible to to Botrytis bunch rot after heavy rain.

Other pests, pest damage or diseases:

Text Updated: 07/15