Agriculture: Grape Pest Management Guidelines


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

About Dormancy

What should you be doing during this time?

In the San Joaquin Valley, sample for nematodes from November to February.

Carry out preventative practices for trunk diseases:

  • Use delayed pruning or double pruning in February or later.
  • Use applications of pruning-wound protectants after pruning and before rain in November through January.

Carry out dormant-season sanitation activities.

  • Destroy prunings of older infested wood to reduce pest sources.
  • Remove dried grape clusters on vines and disc weeds and clusters where orange tortrix or omnivorous leafroller is a problem.
  • In vineyards with a history of branch and twig borers, examine old pruning scars and dead parts of vines for brown frass and wood dust.
  • If you have vine mealybug, steam sanitize equipment before moving to uninfested area of the vineyard.

Survey weeds to plan a weed management strategy.

  • Pay close attention to weeds that may present a special problem or management challenge.
  • Record your observations (example survey form PDF).
  • Use records to make herbicide selections in vineyards where sprays are planned.
Text Updated: 07/15