Pacific Northwest 1998 An Online Guide to Plant Disease Control

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OSU Extension Office
 
Gooseberry and Currant (Ribes sp.) -- Anthracnose
 
Cause: Drepanopeziza ribis (asexual: Gloeosporidiella ribis), a fungus that overwinters on dead leaves. Small, mushroom-like fruiting bodies (apothecia) are on fallen leaves in spring. They produce airborne ascospores that infect newly developing leaves. Rainy weather favors spore release and infection. Different fruiting bodies (acervuli) are produced in 3 to 4 weeks after ascospore infection. Acervuli produce conidia which are rain splashed and infect healthy leaves. The disease is serious in wet seasons.
Symptoms: Small, dark brown, round or irregular leaf spots develop which, when abundant, may cause foliage to yellow and drop by midseason. Small, grayish bodies (acervuli) develop in leaf lesions. The disease reduces the plant's vitality, growth, and productiveness.

On currants, fruit as well as leaves may show spotting like fly specks. Severely infected berries crack open and drop.

Notice the lesions with purple borders and tan centers.

Numerous leaf spots on these currant leaves.

 
Cultural control:

  1. Remove and destroy dead leaves from under bushes.
  2. Cultivate under and around bushes to bury leaves before budbreak in spring.
  3. Prune and thin bushes to provide better air circulation and drying conditions.
Chemical control: Starting when the first leaf reaches full size, apply during wet spring conditions until dry weather prevails in summer.

  1. Abound at 6 to 15.5 fl oz/A. Do not apply more than twice sequentially or more than three times per year. May be applied on the day of harvest. 4-hr reentry.
  2. Copper-based products.
    1. Bordeaux 8-8-100.
    2. Champ Formula 2 at 0.83 gal/A. 24-hr reentry.
    3. Copper-Count-N at 5 to 10 quarts/A. 12-hr reentry.
    4. Cuprofix Ultra 40 Disperss at 6.5 lb/A. 12-hr reentry.
    5. Kocide 3000 at 4.25 lb/A. 24-hr reentry.
    6. Nordox 75 at 3 to 6.5 lb/A. 12-hr reentry.
  3. 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.
  4. Lime sulfur (29%) at 3 pints/100 gal water. 48-hr reentry.
  5. Rally 40 WSP at 5 oz/A. Applications may be made up to the day of harvest. Do not apply more than 40 oz/A/season. 24-hr reentry.
  6. Switch 62.5 WG at 11 to 14 oz/A. May be used up to and including the day of harvest. Do not apply more than twice sequentially or use more than 56 oz/A/season. 12-hr reentry.
References:
Booth, C. and J.M. Waller. 1979. Drepanopeziza ribis. CMI Descriptions of Pathogenic Fungi and Bacteria, No. 638. Surrey, England: Commonwealth Mycological Institute.
Content edited by: Jay W. Pscheidt on January 1, 2009
 
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