Pacific Northwest 1998 An Online Guide to Plant Disease Control

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OSU Extension Office
 
Raspberry (Rubus) -- Anthracnose
 
Cause: Elsinoe veneta, a fungus widespread in the Pacific Northwest in black and occasionally in red raspberry cultivars. All black raspberry cultivars are susceptible. The disease is not always severe enough to warrant the cost of spraying. It is particularly serious if rains continue late in spring, when spots on canes may be plentiful enough to retard sap flow, thus girdling the canes. Early-season infections are more severe than late-season ones.
Symptoms: Circular sunken spots, about 0.12 inch or more in diameter, form on lower canes. At first, infections are purplish; later the center turns gray. As canes age, spots become sunken, and margins are raised and purplish. Current-season canes show initial symptoms near the ground. Most infection occurs on the side of the cane toward the plant's center and from 6 to 30 inches up the cane. Infection often results in uneven berry ripening.

Note the oval lesions with gray centers and purple borders.

As canes age, spots become sunken, and margins are raised and purplish.

 
Cultural control:

  1. Use certified planting stock.
  2. Cut away old fruiting canes close to the ground and burn them at once.
  3. Remove all infected and dead canes after harvest.
  4. Maintain less dense, narrow rows for better air circulation.
  5. Resistant red raspberry cultivars include 'Willamette', 'Heritage', 'Chilcotin', 'Nootka', and 'Meeker'.
Chemical control:

  1. Late dormant or delayed dormant. Further control not needed in most years.
    1. Bordeaux 8-8-100.
    2. Fixed coppers such as , Kocide, Nu-Cop, or C-O-C-Swith a 24-hr reentry or Cuprofix, Copper-Count-N or Nordox with a 12-hr reentry.
    3. Lime sulfur (29%) at 6 to 12 gal/100 gal water. Polysul, Lily Miller Dormant Spray for Disease and Bonide Lime Sulfur Spray are registered for home use. 48-hr reentry.
    4. Sulforix at 3 gal/100 gal water. 48-hr reentry.
  2. When new canes are 6 to 12 inches high.
    1. Abound at 6 to 15.5 fl oz/A. Do not apply more than two (2) sequential applications or more than three (3) applications per year. May be applied on the day of harvest. 4-hr reentry.
    2. Cabrio EG at 14 oz/A. Do not apply more than twice sequentially or more than four times per year. May be used at harvest. 24-hr reentry.
    3. Captan 80 WDG at 2.5 lb/A. Do not apply within 3 days of harvest. 72-hr reentry.
    4. CaptEvate 68 WDG at 3.5 lb/A Do not apply more than two (2) consecutive application, within 3 days of harvest or more than 17.5 lb/A/season. 48-hr reentry.
    5. Pristine at 18.5 to 23 oz/A. Do not use more than 2 consecutive applications or more than 4 times/year. Can be used day of harvest. 12-hr reentry.
References:
Munro, J.M., A. Dolan, and B. Williamson. 1988. Cane spot (Elsinoe veneta) in red raspberry: Infection periods and fungicidal control. Plant Pathology 37:390-396.
Content edited by: Jay W. Pscheidt on January 1, 2009
 
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