UC IPM Online UC ANR home page UC IPM home page

UC IPM Home

Search

SKIP navigation
How to Manage Pests

Home & garden
Agriculture
Natural environments
Exotic & invasive

Weather data & products
Degree-days
Interactive tools & models

Identification Galleries

Natural enemies
Weeds

Educational Resources

Publications & more
Workshops and events
Training programs
Pesticide information

Research and IPM

Grants programs
Funded-project results

 
  Printer-friendly version

How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Yellow rust pustules on raspberry leaves.

Caneberries

Yellow Rust

Pathogen: Phragmidium rubi-idaei

(Reviewed 5/08, updated 5/08)

In this Guideline:

SYMPTOMS

Of the major caneberry crops, yellow rust infects only red raspberry and is not a systemic pathogen, meaning the pathogen does not spread internally through the plant. In spring, yellowish orange pustules (aecia) form on the tops of raspberry leaves close to the ground. Aecia occurring early on the tops of the leaves is a general way to distiguish this rust from late leaf rust, which also infects red raspberry.

Severely affected leaves can dry out and die. Later in June and July, orange to yellow pustules (uredinia) appear on the undersides of leaves; these structures later darken as black teliospores develop from the middle of July to fall. The yellow rust fungus overwinters as teliospores on the bark of remaining floricanes (fruiting canes). Such canes are the sources of inoculum that affect emerging leaves and primocanes (vegetative canes) the following spring.

MANAGEMENT

If possible and horticulturally sensible, complete removal of floricane and first flush of primocane is useful in controlling this disease, as it removes most sources of innoculum. Any method of pruning that improves air circulation is helpful in reducing yellow rust, as this allows leaves, flowers, and fruit to dry more quickly, subsequently reducing plant susceptibility.

Organically Acceptable Methods
Cultivating to bury old crop debris, removal of fruiting canes after harvest, and sprays of lime sulfur or some fixed copper products 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.
 
DELAYED DORMANT
A. FIXED COPPERS# Label rates 24 0
  MODE OF ACTION GROUP NAME (NUMBER1): Multi-site contact (M1)
  COMMENTS: For organically certified produce, check with your certifier for acceptable copper formulations.
 
FIRST BLOOM
A. FIXED COPPERS# Label rates 24 0
  MODE OF ACTION GROUP NAME (NUMBER1): Multi-site contact (M1)
  COMMENTS: For organically certified produce, check with your certifier for acceptable copper formulations.
 
B. PYRACLOSTROBIN/BOSCALID
  (Pristine) 18.5–23 oz 12 0
  MODE OF ACTION GROUP NAME (NUMBER1): Quinone outside inhibitor (11) and Carboxamide (7)
  COMMENTS: Restricted entry interval is 12 hours. To limit the potential for development of resistance, do not apply more than 4 application of this or other Group 7 and 11 fungicides per season.
 
C. PYRACLOSTROBIN
  (Cabrio) EG 14 oz 24 0
  MODE OF ACTION GROUP NAME (NUMBER1): Quinone outside inhibitor (11)
  COMMENTS: Restricted entry interval: 24 hours. Do not make more than two sequential applications before alternating to a product with a different mode of action Group number.
 
D. MYCLOBUTANIL
  (Rally) 40WSP 1.25–1.5 oz 24 0
  MODE OF ACTION GROUP NAME (NUMBER1): Demethylation inhibitor (3)
  COMMENTS: Initiate applications as early as budbreak and continue at 10- to 14-day intervals. Shorter intervals may be used under heavy disease pressure. Do not apply more than 10 oz/acre/season.
 
E. TRIADIMEFON
  (Bayleton) 50DF 4 oz 12 1
  MODE OF ACTION GROUP NAME (NUMBER1): Demethylation inhibitor (3)
  COMMENTS: For use on raspberries only. Restricted entry interval is 12 hours. Apply in not less than 20 gal water/acre using ground equipment. Make additional applications at 4- to 6-week intervals as needed, not to exceed 7 applications in one year or 2 applications within the same 30-day period.
 
# Acceptable for use on organically grown produce.
+ 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

Top of page

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2008 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See How to manage pests, or in the U.S., contact your local Cooperative Extension office for assistance. /PMG/r71101111.html revised: May 30, 2008. Contact webmaster.