Year-Round IPM Program Pages
Wine and Raisin Grapes
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.
- Mitigate pesticide effects on air and water quality.
What should you be doing during this time?
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.
In coastal areas, set out orange tortrix pheromone traps by December.
- Check traps twice weekly until a biofix date is established; thereafter, check traps weekly.
- Keep records (example monitoring form ).
If present, treat for Phomopsis cane and leaf spot before rainfall.
Sample for nematodes in January or February.
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 an uninfested area of the vineyard.
Survey weeds to plan a weed management strategy. If herbicides are used.
- Use the late-winter survey form to record your observations and make pre- and postemergence herbicide selection decisions.
- Remove leaves and debris under the vine before applying herbicides.
- Do not make preemergence herbicide applications if heavy rains are expected soon after application. However, applications should be made when a rain event of 0.25-0.50 inches is expected within 2-3 weeks.
- If possible, make preemergence herbicide application after dormant activities, such as pruning, are completed to reduce soil movement.