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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Caneberries

Cladosporium Fruit Rot

Pathogen: Cladosporium herbarum and C. cladosporoides

(Reviewed 5/08, updated 5/08)

In this Guideline:

SYMPTOMS

Blackberry and raspberry plants with Cladosporium fruit rot have berries that are covered with a soft, velvety, olive-green mycelial growth. While this growth is unsightly, it does not often damage the fruit. Cladoporium herbarum and C. cladosporoides can occur alone or in association with lesions caused by Botrytis cinerea (the causal agent of Botrytis fruit rot).

COMMENTS ON THE DISEASE

Cladosporium fruit rot of caneberry is primarily a postharvest storage disease. Even though these fungi cause little actual damage to fruit, the mycelial growth on the fruit is unappealing, so the fruit is unmarketable. Optimal temperature for the growth of these fungi is between 68° to 77°F (20° to 25°C), but may occur at lower temperatures during normal fruit storage.

This fruit rot is most commonly associated with fruit that is sunburned or damaged in some manner.

MANAGEMENT

Practice good sanitation within the planting to reduce inoculum levels. Harvest regularly and carefully, removing damaged and infected fruit. Cool berries as rapidly as possible to an optimum of 32°F (0°C). Treat if weather conditions are favorable for the development of Botrytis and Cladosporium fungi (i.e., rain).

Organically Acceptable Methods
Good sanitation and harvest practices are acceptable methods in an organically certified crop.

Common name Amount/Acre R.E.I.+ P.H.I.+
(trade name)   (hours) (days)
When choosing a pesticide, consider the general properties of the fungicide as well as information relating to environmental impact.
 
A. CYPRODINIL/FLUDIOXONIL
  (Switch) 11–14 oz 12 0
  MODE OF ACTION GROUP NAME (NUMBER1): Anilinopyrimidine (9) and Phenylpyrrole (12)
  COMMENTS: Make no more than two sequential applications before switching to a fungicide with a different Group number mode of action. Do not apply more than 56 oz/acre/year.
 
B. IPRODIONE
  (Rovral) 4F 1–2 pt 24 0
  MODE OF ACTION GROUP NAME (NUMBER1): Dicarboximide (2)
  COMMENTS: Apply in a minimum of 100 gal water/acre. Do not make more than 4 applications/crop/season.
 
+ Restricted entry interval (R.E.I.) is the number of hours (unless otherwise noted) from treatment until the treated area can be safely entered without protective clothing. Preharvest interval (P.H.I.) is the number of days from treatment to harvest. In some cases the REI exceeds the PHI. The longer of two intervals is the minimum time that must elapse before harvest.
1 Group numbers are assigned by the Fungicide Resistance Action Committee (FRAC) according to different modes of actions (for more information, see http://www.frac.info/). Fungicides with a different group number are suitable to alternate in a resistance management program. In California, make no more than one application of fungicides with mode of action Group numbers 1, 4, 9, 11, or 17 before rotating to a fungicide with a different mode of action Group number; for fungicides with other Group numbers, make no more than two consecutive applications before rotating to fungicide with a different mode of action Group number.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Caneberries
UC ANR Publication 3437
Diseases
S. T. Koike, UC Cooperative Extension, Monterey County
M. P. Bolda, UC Cooperative Extension, Santa Cruz County
E. J. Perry, UC Cooperative Extension, Stanislaus County
W. D. Gubler, Plant Pathology, UC Davis
L. J. Bettiga, UC Cooperative Extension, Monterey County

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