Agriculture: Grape Pest Management Guidelines

Delayed-Dormancy

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 Delayed-Dormancy

What should you be doing during this time?

On a warm day, monitor vines and spurs for:

  • Mealybugs
  • Ants associated with mealybugs and European fruit lecanium scale
  • Orange overwintering spider mites
  • Cutworm

Keep records (example monitoring form PDF). Treat if needed according to the Pest Management Guidelines.

In coastal areas, check orange tortrix pheromone traps that were put up during the dormant period. Keep records (example monitoring form PDF).

Just before budbreak, deploy omnivorous leafroller pheromone traps. Check traps twice weekly until a biofix date is established; thereafter, check traps weekly. Keep records (example monitoring form PDF).

Monitor for sharpshooters:

  • Glassy-winged sharpshooter

In coastal regions near riparian and landscape areas check traps for:

  • Blue-green sharpshooter

Change traps weekly. Keep records (example monitoring form PDF).

Vineyard floor management before bud break:

  • Control weeds with mowing, cultivation, or herbicides
  • Mow tall cover crop

Other pests or pest damage you may see.

  • Rodents
  • Branch and twig borer
  • Click beetles
  • Bud beetles
  • Dead spurs from trunk diseases
Text Updated: 07/15