Agriculture: Grape Pest Management Guidelines

Véraison

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

About Véraison

What should you be doing during this time?

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

Check pheromone traps for:

  • Omnivorous leafroller
  • Orange tortrix in coastal areas

Keep records (example monitoring form PDF).

Check vine mealybug pheromone traps.

  • If males are found, or if honeydew, sooty mold, or ant activity is found, look for sessile nymph/female infestations on surrounding vines.
  • Educate field crew to flag cluster infestations for treatment.

Treat if needed according to the Pest Management Guidelines.

Monitor grape and obscure mealybugs. Keep records (example monitoring form PDF). If you see crawlers, treat if needed according to the Pest Management Guidelines.

Monitor glassy-winged sharpshooter. Check traps weekly. Keep records (example monitoring form PDF).

Look for vine symptoms of Pierce's disease. Or for viruslike symptoms of early fall color and/or poor fruit maturity.

If rain occurs shortly after veraison, monitor for Botrytis.

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

  • Omnivorous leafroller
  • Orange tortrix
  • Grape leaffolder
  • Western grapeleaf skeletonizer

Keep records (example monitoring form PDF).

Inspect roots of weakened vines for galls or phylloxera.

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

Other pests or pest damage you may see.

  • Whitefly
  • European fruit lecanium scale
  • Grasshoppers/katydids
  • Esca
Text Updated: 07/15