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Grape
Year-Round IPM Program for Wine and Raisin Grapes
These practices are recommended for a monitoring-based IPM program that
reduces water quality problems related to pesticide use. Links take you
to information on how to monitor, forms to use, and management practices.
Track your progress through the year with the annual
checklist form .
Water quality becomes impaired when pesticides move off site and into
water. Each time a pesticide application is considered, review the Pesticide
Application Checklist at
the bottom of this page to learn how to minimize water quality problems.
This program covers the major pests of grape; information on additional
pests is included in the
Grape
Pest Management Guideline.
This year-round program applies only to wine and raisin grapes, it does
not include information for table grapes. For table
grapes, contact your
farm advisor for IPM practices specific to your location.
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Delayed-dormant period activities |
| What should you be doing at this time? |
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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 on a monitoring
form .
Treat** if needed according to the PMGs. |
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In coastal areas, check orange tortrix pheromone traps that were put up during
the dormant period.
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Just before budbreak, put up omnivorous
leafroller pheromone traps.
- Check traps twice weekly until a biofix date is established; thereafter,
check traps weekly.
- Keep records on a monitoring
form.
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If sharpshooters
are a problem in your area, set out sticky traps
just before budbreak for:
- Glassy-winged sharpshooter
In coastal regions near riparian and
landscape areas:
Change traps weekly. Keep records on
a monitoring form . |
Keep records of other pests or
pest damage you may see.
- Rodents
- Branch and twig borer
- Click beetles
- Bud beetles
- Eutypa
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Budbreak period activities |
| What should you be doing at this time? |
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On a warm day, monitor vines and spurs for:
- Mealybugs
- Ants associated with mealybugs and European fruit lecanium
scale.
- Orange overwintering spider mites.
- Cutworm
- Thrips
Keep records on a monitoring
form .
Treat** if needed according to the PMGs. |
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Check pheromone traps for:
- Omnivorous leafroller
- Orange tortrix
in coastal areas
Keep records on a monitoring
form . |
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Monitor leaf wetness. Track powdery
mildew ascospore release and mildew risk index.
- Treat** if needed according to PMG.
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Consider treating** for phomopsis cane and leaf spot if rain continues
after budbreak. |
| Remove vines that have spring symptoms of Pierce's
disease. |
Check sticky traps for sharpshooters:
- Glassy-winged sharpshooter
In coastal regions near riparian and landscape
areas check for:
Change traps weekly. Keep records on a monitoring
form. |
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Rapid shoot growth period activities |
| What should you be doing at this time? |
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Look for thrips if cold
weather persists. |
| Look for spider mites
and their natural enemies weekly on emerging
leaves. Map areas of concern for bloom monitoring. |
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Monitor leafhoppers weekly, starting
a month after budbreak or whenever first nymphs appear.
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Continue checking pheromone traps for:
- Omnivorous leafroller
- Orange tortrix in coastal areas
Keep records on a monitoring
form . |
In southern San Joaquin Valley, put up vine
mealybug pheromone traps around April 1 and check every two weeks.
- If males are caught or honeydew, sooty mold, or ants are found,
look for female infestations on surrounding vines.
- Keep records on a monitoring form .
- Treat** if needed according to PMG.
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Monitor
caterpillars if
they have been a problem in the past:
- Western grapeleaf skeletonizer
- Grape leaffolder
- Orange tortrix (in coastal vineyards)
- Omnivorous leafroller
Map areas of concern for bloom monitoring. |
| If European
fruit lecanium scale has been a problem in the
past, monitor female development on old wood. |
| Manage ants if
mealybugs and scale are a problem. |
Monitor sharpshooters:
- Glassy-winged sharpshooter
In coastal regions near riparian and landscape
areas check for:
Change traps weekly. Keep records on a monitoring
form |
| Monitor for flagging. If you see a
flag, distinguish between Botrytis shoot blight and branch and twig
borer. |
Monitor leaf wetness. Track powdery
mildew ascospore release and mildew risk index.
- Treat**
if needed according to PMG.
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Survey weeds to plan
a weed management strategy.
- If herbicides** are used, use the late-spring
weed survey form
to record your observations, and to make pre- and postemergent herbicide
selection decisions.
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Keep records of other pests or
pest damage you may see.
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Bloom to veraison period activities |
| What should you be doing at this time? |
Monitor leafhoppers
and spider mites weekly.
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| Monitor for Botrytis and powdery
mildew by inspecting leaves and shoots. |
| If European fruit lecanium scale has
been a problem in the past, monitor for egg hatch to time treatment**. |
Check pheromone traps for:
- Omnivorous leafroller
- Orange tortrix in central coast areas
Keep records on a monitoring
form . |
In areas other than southern San Joaquin valley, put up vine
mealybug pheromone traps. In all areas, check traps every
two weeks.
- If males are caught or honeydew, sooty mold, or ants are found,
look for female infestations on surrounding vines.
- Keep records on a monitoring
form .
- Treat**
if needed according to PMG.
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Monitor Pseudococcus mealybugs by
looking for honeydew, sooty mold, and ant activity.
- Keep records on a monitoring
form .
- If you see crawlers, treat** if needed according to PMG.
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To reduce possible summer rot, Botrytis,
and current leafhoppers,
remove basal leaves or basal lateral shoots beginning around berry
set.
- Time leaf pull before first-generation grape leafhoppers become adults.
- Treat** for Botrytis prior to rain, if leaves are not removed.
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Monitor
caterpillars if they have been a problem in the past:
- Omnivorous leafroller
- Orange tortrix
- Grape leaffolder
- Western grapeleaf skeletonizer
Keep records on a monitoring
form . |
Monitor sharpshooters:
- Glassy-winged sharpshooter
In coastal regions near riparian and landscape areas check for:
Change sticky traps weekly. Keep records on
a monitoring form . |
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Keep records of other pests or pest
damage you may see.
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Veraison period activities |
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Harvest period activities |
| What should you be doing at this time? |
| Be aware that high populations of adult leafhoppers may interfere with
hand harvesting. |
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Monitor for grape, obscure, and vine
mealybugs.
- Look for cluster infestations and mark on map.
- Educate harvest crew to flag vine mealybug cluster infestations
for treatment.
Treat** vine mealybug if needed according
to PMG. |
| If you have vine mealybug, steam sanitize equipment before moving to
an uninfested area of the vineyard. |
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For Pierce’s
disease:
- Flag vines with symptoms for removal.
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| If necessary, continue managing birds with netting or scare devices. |
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Treat** for Botrytis
prior to any anticipated rain. |
| Sample soil and roots for nematodes; look at roots for galls and phylloxera. |
Monitor for glassy-winged
sharpshooter:
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Postharvest period activities |
| What should you be doing at this time? |
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If necessary, treat** for vine mealybug immediately
after harvest according
to the PMG. |
| To reduce risk of transferring vine
mealybug, do not place winery pomace in the vineyard; compost pomace
or cover piles securely with clear plastic. |
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Look for symptoms of Pierce’s
disease on vines and flag for removal. |
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Look for European fruit lecanium scales on
leaves. |
| If you desire a cover crop, seed after harvest. |
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Dormant period activities |
| What should you be doing at this time? |
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Apply lime sulfur** for powdery
mildew in areas other than Madera,
Fresno, and Tulare counties. |
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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 on a monitoring
form .
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If present, treat** for Phomopsis cane and leaf spot before rainfall. |
| Sample for nematodes in
January or February. |
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Carry out dormant-season sanitation activities.
- Prune late in dormancy after rains to reduce wound infections.
- 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.
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Survey weeds to plan a weed management
strategy.
- If herbicides** are used, use the late-winter
survey form to
record your observations and to make pre- and postemergent herbicide
selection decisions.
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**Pesticide application checklist |
Before a pesticide application is made and when planning for possible
applications in an IPM program, review and complete this checklist to
minimize water quality and other problems.
- Follow each practice in the year-round IPM program.
- Identify target pest, treatment threshold, trigger, or justification
for treatment.
- Consider nonchemical alternatives.
- Identify important natural enemies that might be impacted by pesticide
application.
- Choose a pesticide from the UC IPM Pest Management Guidelines for
the target pest, considering impact on natural enemies and consulting
the UC IPM Watertox Database for
water quality concerns. Select an alternative chemical or nonchemical treatment when risk is high.
- Consider chemical class if pesticide resistance is an issue.
- Identify sensitive areas (for example, waterways or riparian areas) surrounding
your application site.
- Identify practices or mitigation measures to be used to reduce pesticide
movement off-site.
- Choose sprayers and application methods that minimize off-site movement.
- Review and follow pesticide handling, storage, and disposal guidelines.
- After an application is made, record application date, product used,
rate, and location of application. Follow up to confirm that treatment was
effective.
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