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Small Fruit
blackberry, raspberry, grape, gooseberry, strawberry
 

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Last Modified: 02-Nov-2012
Copyright © 2004, University of Kentucky, College of Agriculture, Department of Plant Pathology
 

Plant: Blackberry (Rubus subg. Eubatus) (Rosaceae) Back to List
Disease/Disorder: Downy mildew
Causal agent: Peronospora (fungus)
Signs: barely visible downy mycelial growth in spots on lower side of leaves
Symptoms: red/purple spots or blotches
Total image number: 4
Sample is of some transplants in a tray.

  
 
 
                       

Plant: Blackberry (Rubus subg. Eubatus) (Rosaceae) Back to List
Disease/Disorder: gall
Causal agent: possibly a Diplolepis sp., a cynipid gall wasp
Signs: found an immature wasp inside individual galls
Symptoms: spiny mass of many small galls
Total image number: 4
The cluster of growths on the stem in this sample has been caused by a cynipid gall wasp, possibly a species of Diplolepis.

  
 
 
                         
 

Plant: Blackberry (Rubus subg. Eubatus) (Rosaceae) Back to List
Disease/Disorder: Double blossom or rosette
Causal agent: Cercosporella (fungus)
Signs: spores visible under miscroscopic examination.
The 3rd image shows conidiophores emerged from the outer surface of a floral bud.
Symptoms: proliferation of small, leafy shoots instead of normal shoot growth
Total image number: 4

 

 

 

 

 

 

 

 

 

Blackberry (Rubus subg. Eubatus) (Rosaceae) Back to List
Disease/Disorder: herbicide injury
Causal agent: 'glyphosate' ("RoundUp")
Signs: none
Symptoms: new leaf growth is long, narrow with a lack of green color.
Total image number: 4

 
 
                       

Plant: Raspberry (Rubus subg. Idaeobatus) (Rosaceae) Back to List
Disease/Disorder: Septoria leaf spot
Causal agent: Septoria ribis (fungus)
Signs: spore-producing bodies ("pycnidia") can be seen within leaf spots.
Symptoms: brown leaf spots can coalesce to form blighted areas
Total image number: 4

     
 
 
     
                       

Plant: Grape (Vitus sp.) (Vitaceae) Back to List
Disease/Disorder: Black rot (fruit phase)
Causal agent: Guignardia bidwelli (fungus) Fungus shown is the a sexual stage Phyllosticta ampelicida.
Signs: dark spore-producing bodies ("pycnidia") and sometimes oozings of spores can be seen within the infected area.

Symptoms: tan spots on fruit which will evetually cause the entire fruit to decay and mummify
Total image number: 4

  
 
 
                       

Plant: Grape (Vitus sp.) (Vitaceae) Back to List
Disease/Disorder: Anthracnose, fruit rot phase called Bird's eye rot
Causal agent: Sphaceloma ampelimun (fungus)
Signs: spore-producing bodies ("acervuli") can be seen within leaf spots.
Symptoms: brown leaf spots can coalesce to form blighted areas
Total image number: 12

 
 
 
 
 
 
                       
Plant: Grape (Vitus sp.) (Vitaceae) Back to List
Disease/Disorder: Leaf blight, also called Isariopsis leaf spot
Causal agent: Pseudocercospora vitis (fungus)
Signs: spore-producing bodies ("synnemata") can be seen within leaf spots.
Symptoms: purple black leaf spots can coalesce to form blighted areas
Total image number: 11		  
 
                     

Grape (Vitus sp.) (Vitaceae) Back to List
Disease/Disorder: herbicide injury
Causal agent: growth regulator (e.g. 2,4-D)
Signs: none
Symptoms: leaves are disorted with veins becoming parallel. Leaf tips are elongated.
Total image number: 3

 
 
                       

Plant: Gooseberry (Ribes hirtellum) (Saxifragaceae) Back to List
Disease/Disorder: Anthracnose
Causal agent: Drepanopeziza ribis (fungus)
Signs: usually a single spore-producing body ("acervulus") can be seen in the spot
Symptoms: red/purple spotting on leaves
Total image number: 4

  
 
 
                       

Plant: Strawberry (Fragaria x ananassa) (Rosaceae) Back to List
Disease/Disorder: Leaf spot
Causal agent: Mycosphaerella fragariae (fungus)
Signs: in the center portion of the spot is a patch of tan-colored mycelium which contains colorless conidiophores and conidia (Note: Blue stain was used to emphasize the conidiophores and conidia.)
Symptoms: tan-centered spots with a purple border
Total image number: 10

 
 
 
                       
Plant: Strawberry (Fragaria x ananassa) (Rosaceae) Back to List
Disease/Disorder: Anthracnose fruit rot
Causal agent: Colletotrichum sp. (fungus)
Signs: Within the sunken areas of the fruit, the slightly raised, orange bumps are acervuli, spore producing structures of the fungus. Orange masses of spores are produced within these acervuli.
Symptoms: Light brown, water-soaked spots on ripening fruit.
NOTE: Symptoms on fruit on the far left, are not due to Anthracnose fruit rot.
Total image number: 9		  
 
 
                       
Plant: Strawberry (Fragaria x ananassa) (Rosaceae) Back to List
Disease/Disorder: Phomopsis leaf blight
Causal agent: Phomopsis obscurans (fungus)
Signs: Spore producing structures of the fungus, pycnidia, are seen within the brown, blighted areas.
Spores are produced within these pycnidia.
Symptoms: Brown, zonate blighted areas on the leaves.
Total image number: 12		  
 
 
                         
Plant: Strawberry (Fragaria x ananassa) (Rosaceae) Back to List
Disease/Disorder: Leaf scorch
Causal agent: Diplocarpon earlianum (fungus), anamorph Marssonina fragariae shown
Signs: in the center portion of the spot are brown to black acervular conidiomata (spore-producing bodies) of the asexual stage Marssonina. Colorless two-celled conidia are produced.
Symptoms: Brown-centered spots with a darker border
Total image number: 10 		 
 
 
                         
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