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Blackberry Double blossom Blackberry Downy mildew Blackberry Insect gall Blackberry glyphosate Raspberry Septoria LS Gooseberry Anthracnose Grape Anthracnose Grape Black rot Grape GrowthReg Strawberry Anthracnose fruit Strawberry leaf blight Strawberry leaf spot

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Last Modified: 29-Oct-2008
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

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