Agriculture: Grape Pest Management Guidelines

Postharvest

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 Postharvest

What should you be doing during this time?

If necessary, treat for vine mealybug immediately after harvest according to the Pest Management Guidelines.

To reduce risk of transferring vine mealybug, do not place winery pomace in the vineyard; compost pomace or cover piles securely with clear plastic.

Look for symptoms of Pierce’s disease on vines and flag for removal. Also for virus-infected vines.

Look for European fruit lecanium scales on leaves; treat according to the Pest Management Guidelines.

If you desire a cover crop, seed after harvest. Cover should be planted when regular irrigation is used or rain is expected. If early rain is followed by a dry period, germinated seeds may die without further irrigation.

Record weeds present in the vineyard. Determine if herbicide applications are warranted. Contact herbicides may be more desirable at this time. Extra care must be taken when using systemic herbicides (glyphosate). Drift may result in damage to new foliage developing in spring.

Carry out sanitation activities and vine surgery for trunk diseases well before the first rain event:

Text Updated: 07/15