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Peach

Year-Round IPM Program

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 (230KB, PDF).

Water quality becomes impaired when pesticides move offsite 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 peach; information on additional pests is included in the Peach Pest Management Guideline.

Dormant/Delayed-dormant season activities
Bloom season activities
Fruit development period activities

Harvest activities
Postharvest activities
Pesticide application checklist

Dormant/Delayed-dormant season activities (leaf fall to bud swell)

Dormant Peach Why is this season important in an IPM program?  
Special issues of concern related to water quality: dormant sprays, drift, and rain runoff.
What should you be doing during this period?

Prune trees, removing and destroying:

Apply fungicide treatments** as needed according to PMGs:

Manage orchard floor vegetation:

Make an oil treatment** for scales and mite eggs.

  • If you saw increasing damage from scales last year, take a dormant shoot sample to see if an insect growth regulator should be added to the oil treatment.

Treat** peach twig borer with environmentally sound material or delay treatment until bloom.

Keep a record of other pests you may see:

  • Peach twig borer hibernacula
  • Peach silver mite
  • Fruittree leafroller egg masses
  • Armillaria root rot
  • Voles
  • Pocket gophers
  • Stink bugs
  • Tree borers

Bloom season activities (green tip to petal fall)

Peach Bloom Why is this season important in an IPM program?
Special issues of concern related to water quality: runoff and drift.
What should you be doing during this period?

Put out pheromone traps for:

  • Oriental fruit moth (February 15 in San Joaquin Valley, February 20 in Sacramento Valley)
  • Omnivorous leafroller (San Joaquin Valley—February 20)
  • San Jose scale (February 25—San Joaquin and Sacramento valleys)

Check traps and keep records on a monitoring/degree-days form (48KB, PDF).

If using mating disruption for oriental fruit moth, place dispensers in orchard after first moth is caught but no later than March 5.

Examine flower clusters and leaves for:

  • Peach twig borer
  • Fruittree leafroller
  • Obliquebanded leafroller
  • Katydids

Watch ground cover for pests:

  • Stink bugs
  • Plant bugs
  • Katydids (primarily San Joaquin Valley)

When rainy conditions promote disease, time fungicide treatment** according to PMGs:

Monitor for diseases:

  • Shot hole
    • Fruiting structures in leaf lesions as long as weather is wet.
    • Manage if needed according to PMG.

Observe the orchard for vertebrates and manage as necessary:

Manage orchard floor vegetation:

  • Cut ground cover short

Keep records of other pests you may see:

Fruit development period activities (petal fall to harvest)

Peach Fruit Growth Why is this period important in an IPM program?
Special issues of concern related to water quality: runoff from irrigation, and drift.
What should you be doing during this period?

Put up pheromone traps for:

  • Peach twig borer (March 20 in San Joaquin Valley, April 1 in Sacramento Valley)
  • Obliquebanded leafroller (April 15 in San Joaquin Valley and Sacramento Valley)

Monitor shoot strikes for damage from oriental fruit moth and peach twig borer.

  • Keep records on a monitoring form (84KB, PDF).
  • Manage if needed according to PMGs.

If wet weather persists, continue to monitor for rust:

  • Manage if needed according to PMG.

If orchard has a history of scab:

  • Treat** 3 weeks after full bloom.
  • Treat** again 2 weeks later if scab was severe the previous year.

Where ground covers are present, take sweep samples for pests, beginning from early April to early June for:

  • Plant bugs (Lygus and Calocoris).
  • Katydids.
  • Stink bugs.

Manage if needed according to PMG.

Examine fruit regularly after pit hardening or color break in May for pest damage.

Monitor powdery mildew through pit hardening and treat** if needed according to PMG.

Manage orchard floor vegetation:

Monitor spider mites from May through August:

  • For best evaluation, conduct two 5-minute searches and keep records on a monitoring form (148KB, PDF).
  • Manage if needed according to PMG.

Take leaf samples in July to analyze for nitrogen, phosphorus, potassium, and micronutrients.

  • Select 60 to 80 mid-shoot leaves from moderately vigorous fruiting shoots.
If rain is predicted during the last 4 weeks before harvest, treat for ripe fruit rot.

Keep a record of other pests you may see:

  • Armillaria root rot
  • Bacterial canker
  • Phytophthora root and crown rot
  • Peach silver mite
  • Black peach aphid
  • Scab
  • Verticillium wilt
  • Tree borers

Harvest activities

Peach Harvest Why is this period important in an IPM program?
Special issues of concern related to water quality: none.
What should you be doing during this period?

Monitor for ripe fruit rot and treat** if rain is predicted.

Take a harvest sample to determine pest damage.

Postharvest activities

Peach Post Harvest Why is this period important in an IPM program?
Special issues of concern related to water quality: none.
What should you be doing during this period?

In early harvest orchards continue to watch for:

Treat** for leaf curl and shot hole just after leaf fall.

Consider seeding a cover crop if resident vegetation is sparse.

**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.

PDF: You need Adobe Acrobat Reader version 5 or later to view or print this PDF. If this software is not installed on your computer, you can download a free copy of Acrobat Reader.

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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