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How to Manage Pests
UC Pest Management Guidelines
Peach
Jacket
Rot
Pathogens: Botrytis cinerea, Sclerotinia
sclerotiorum, Monilinia laxa, and Monilinia fructicola
(Reviewed 3/06,
updated 3/06)
In this Guideline:
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Jacket rot occurs during the jacket stage when remnants of the
flower parts are still attached to the fruit. The disease causes a brown
discoloration on the fruit under the jacket. The young fruit withers and falls
off the tree within a few weeks.
Development of jacket rot is favored by wet weather during the bloom
and jacket stage.
MANAGEMENT
One fungicide application at full bloom is generally effective.
Fungicides applied during the jacket stage are generally ineffective. Treat at full bloom or
shortly thereafter but before petal
fall.
The final bloom spray for blossom brown rot often provides jacket rot control
if the appropriate fungicides (iprodione, thiophanate-methyl,
pyraclostrobin/boscalid, cyprodinil, etc.) are chosen.
| Common name |
Amount/Acre |
P.H.I.+ |
| (trade name) |
|
(days) |
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| The following materials are listed in order of usefulness in an IPM program, taking into account efficacy. When choosing a pesticide, also consider information relating to environmental impact. |
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| A. |
IPRODIONE |
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(Rovral) 4 |
1–2 pt |
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MODE OF ACTION: A dicarboximide (Group 2)1
fungicide.
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COMMENTS: Addition of a narrow range oil
(superior, supreme) at 1–2% increases the effectiveness of this material. Do not use after petal fall. |
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| B. |
THIOPHANATE-METHYL |
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(Topsin-M) 70 WP |
1.5 lb |
1 |
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MODE OF ACTION: A MBC (Group 1)1
thiophanate fungicide.
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COMMENTS: A benzimidazole fungicide. Apply
thiophanate methyl in combination with another fungicide of different chemistry. |
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| C. |
PYRACLOSTROBIN/BOSCALID |
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(Pristine) |
10.5–14.5 oz |
0 |
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MODE OF ACTION: A Qol (Group 11)1
and carboxamide (Group 7)1 fungicide.
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COMMENTS: A strobilurin and carboxyanilide
fungicide. To reduce the potential for the development of resistance, do not
make more than five applications/season of Pristine or other strobilurin or carboxyanilide fungicides. |
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| D. |
CYPRODINIL |
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(Vangard) 75WG |
5–10 oz |
2 |
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MODE OF ACTION: An AP (Group 9)1
fungicide.
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COMMENTS: An anilinopyrimidine fungicide. |
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| E. |
FENHEXAMID |
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(Elevate) 50WDG |
1–1.5 lb |
0 |
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MODE OF ACTION: A hydroxyanilide (Group 17)
1 fungicide.
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COMMENTS: A hydroxyanilide fungicide. Do
not apply more than 6 lb/acre/season and avoid making more than 2 consecutive applications with this material. |
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| F. |
DICHLORAN |
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(Botran) 75W |
1.33–5.33 lb |
10 |
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MODE OF ACTION: An AH (Group 14)1
fungicide.
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COMMENTS: An aromatic hydrocarbon fungicide. |
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| G. |
CHLOROTHALONIL |
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(Echo 720) |
3.125–4.125 pt |
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(Bravo Ultrex) |
2.8–3.8 lb |
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(Bravo Weather Stik) |
3.125–4.125 pt |
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MODE OF ACTION: A multi-site contact (Group M5)1 chloronitrile fungicide.
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COMMENTS: An aromatic nitrile fungicide.
May cause an allergic skin reaction in some people. Do not use with or
closely following oil sprays. Do not apply after jacket (shuck) split. Do not
apply more than 20.5 pt Bravo Weather Stik/acre/season. Do not apply more than 18.8 lb Bravo Ultrex/acre/season. |
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| H. |
CAPTAN 50 WP |
5 lb |
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MODE OF ACTION: A multi-site contact (Group M4)1 phthalimide fungicide.
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COMMENTS: A phthalamide fungicide. Do not
apply in combination with, immediately before, or closely following oil sprays. Do not apply after 75% petal fall. |
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UC IPM Pest Management Guidelines: Peach
UC ANR Publication 3454
Diseases
W. D. Gubler, Plant Pathology, UC Davis
J. E. Adaskaveg, Plant Pathology, UC Riverside
J. K. Hasey, UC Cooperative Extension, Sutter/Yuba counties
Acknowledgment for contributions to the diseases section:
B. L. Teviotdale, Kearney Agricultural Center, Parlier
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