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How to Manage Pests
UC Pest Management Guidelines
Cherry
Ripe Fruit Rot
Pathogens: Monilinia fructicola, Monilinia laxa, Botrytis cinerea, Rhizopus spp.
(Reviewed 4/06,
updated 4/06)
In this Guideline:
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Fruit rot caused by Monilinia or Botrytis results in dark
brown, firm, circular spots that spread rapidly over fruit. Tan spore masses
may grow on the rotted areas. The fruit become more susceptible as they ripen.
Diseased fruits usually do not remain on the tree until the next season, but
are present as inoculum sources for the current season's crop.
Rhizopus rot is a postharvest storage problem. The decaying fruit tissue is watery and soft; the
fungus is identified by masses of white mycelium with tiny black sporangia that
form most abundantly on fruit near the edge of containers.
Monilinia and Botrytis can infect uninjured ripening fruit. Moisture,
either rain or dew, and injury or fruit cracking increases the probability of
preharvest infection and consequent rot. Rhizopus invades ripe fruit that has been injured or cracked,
causing the fruit to rot after harvest.
Injured, split fruits cannot be protected from Monilinia and Botrytis rot by preharvest sprays, but uninjured fruit can. Protect ripe fruit
from Rhizopus either with a
preharvest treatment (for fruit that will be sold right after harvest) or a
postharvest treatment (for fruit that will be shipped). After harvest, Rhizopus can be controlled if the fruit is stored below temperatures of 40°F.
Apply a preharvest treatment 1 to 14 days before harvest. A
postharvest spray can be made during stem cutting and sizing operations.
| Common name |
Amount/Acre |
P.H.I.+ |
| (trade name) |
|
(days) |
|
| 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.
|
| |
| PREHARVEST: Monilinia and Botrytis
|
| A. |
TEBUCONAZOLE |
| |
(Elite) 45WP |
4–8 oz |
0 |
| |
MODE OF ACTION: A DMI (Group 3)1
triazole fungicide.
|
| |
| B. |
PROPICONAZOLE |
| |
(Break EC, Orbit) |
4 fl oz |
|
| |
MODE OF ACTION: A DMI (Group 3)1
triazole fungicide.
|
| |
COMMENTS: Do not apply more than 8 fl oz/acre/crop from petal fall to harvest. |
| |
| C. |
PYRACLOSTROBIN/BOSCALID |
| |
(Pristine) |
10.5–14.5 oz |
0 |
| |
MODE OF ACTION: A Qol (Group 11)1 and carboxamide
(Group 7)1 fungicide.
|
| |
COMMENTS: To reduce the potential for the development of
resistance, do not make more than five applications/season of Group 7 or 11 fungicides. |
| |
| D. |
FENBUCONAZOLE |
| |
(Indar) 75WSP |
2oz |
0 |
| |
MODE OF ACTION: A DMI (Group 3)1
triazole fungicide.
|
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COMMENTS: Apply in a minimum of 50 gal water/acre. A
protectant fungicide. Begin applications before infections occur if
conditions are conducive to disease development. Do not apply more than 1 lb of formulated product/acre/season. |
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| E. |
FENHEXAMID |
| |
(Elevate) 50WDG |
1–1.5 lb |
0 |
| |
MODE OF ACTION: A hydroxyanilide (Group 17)1
fungicide.
|
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COMMENTS: Do not apply more than 6 lb/acre/season or make more than 2 consecutive applications with this product. |
| |
| F. |
MYCLOBUTANIL |
| |
(Rally) 40 WP |
4–6 oz |
0 |
| |
MODE OF ACTION: A DMI (Group 3)1
triazole fungicide.
|
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COMMENTS: Do not apply more than 3.25 lb/acre/season. More
effective when applied as a concentrate (80-100 gal/acre) than as a dilute spray. |
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| G. |
TRIFLUMIZOLE |
| |
(Procure) 50W |
10–16 oz |
1 |
| |
MODE OF ACTION: A DMI (Group 3)1
triazole fungicide.
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| H. |
FENARIMOL |
| |
(Rubigan) EC |
6–12 oz/200 gal water |
|
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MODE OF ACTION: A DMI (Group 3)1
pyrimidine fungicide.
|
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COMMENTS: Do not apply more than 48 oz before harvest. |
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| I. |
CAPTAN |
| |
(Various) 50WP |
Label rates |
0 |
| |
MODE OF ACTION: A multi-site contact (Group M4)1
phthalimide fungicide.
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COMMENTS: Do not apply in combination with, immediately before, or closely following oil sprays. |
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| POSTHARVEST: Rhizopus only
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| A. |
DICHLORAN |
| |
(Botran) 75W |
1.33 lb/acre |
10 |
| |
MODE OF ACTION: An AH (Group 14)1 fungicide. |
| |
COMMENTS: Apply 10 days before harvest. |
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| POSTHARVEST: Monilinia, Botrytis, and Rhizopus
|
| A. |
TEBUCONAZOLE |
| |
(Elite) 45WP |
8 oz/25,000 lb fruit |
0 |
| |
MODE OF ACTION: A DMI (Group 3)1
triazole fungicide.
|
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COMMENTS: For use on sweet cherries. |
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| B. |
FLUDIOXONIL |
| |
(Scholar) |
8–16 oz/25–100 gal |
|
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MODE OF ACTION: A PP (Group 12)1 fungicide. |
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COMMENTS: Treat 25,000 lb fruit in a high volume (dilute) application with agitation to keep Scholar in solution. |
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More information on cherry fungicides
![[Precautions]](/IMAGES/btn-precautions_bul.gif)
![[UC Peer Reviewed]](/IMAGES/logo-ucpeerreviewed.jpg)
UC IPM Pest Management Guidelines: Cherry
UC ANR Publication 3440
Diseases
J. E. Adaskaveg, Plant Pathology, UC Riverside
W. D. Gubler, Plant Pathology, UC Davis
Acknowledgment for contributions to the diseases section:
B. L. Teviotdale, Kearney Agricultural Center, Parlier
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