Plant Pathology Department, University of Kentucky

Diagnostic Training Images

Other Vegetables

Cabbage

Turnip

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Spinach

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Last Modified: 09-Oct-2012
Copyright © 2004, University of Kentucky, College of Agriculture, Department of Plant Pathology

Plant: Cabbage (Brassica oleracea) (Brassicaceae) Back to List
Disease/Disorder: Bacterial soft rot
Causal agent: Erwinia caratovora (bacteria)
Signs: Bacteria are seen streaming from infected tissue under dark-field microscopy.
Symptoms: Rotted, slimy, foul-smelling tissue
Total image number: 8

Plant: Cabbage (Brassica oleracea) (Brassicaceae) Back to List
Disease/Disorder: Insect injury, thrips
Causal agent: Frankliniella occidentalis (thrips, insect)
Signs: 1mm long, yellow, cigar-shaped body
Symptoms: Necrotic tissue in dashes near veins
Total image number: 4

Plant: Cabbage (Brassica oleracea) (Brassicaceae) Back to List
Disease/Disorder: Phytophthora root rot
Causal agent: Phytophthora dreschleri (fungus) by DNA sequencing
Signs: In culture, various structures can be seen.
Symptoms: Decay of pith tissue in stem very similar to Black shank of tobacco
Total image number: 16

Plant: Turnip (Brassica rapa) (Brassicaceae) Back to List
Disease/Disorder: White spot, leaf spot
Causal agent: Cercosporella (fungus)
Signs:
Symptoms: Light-colored leaf spots.
Total image number: 2

Plant: Turnip (Brassica rapa) (Brassicaceae) Back to List
Disease/Disorder: Black rot
Causal agent: Xanthomonas campestris pv. campestris (bacterium)
Signs: Bacterial streaming.
Symptoms: Leaf yellowing from margins downward.
Total image number: 4

Plant: Potato (Solanum tuberosum) (Solanaceae) Back to List
Disease/Disorder: herbicide injury
Causal agent: "Roundup" 'glyphosate'
Signs:
Symptoms: Yellowing of youngest leaves from the base.
Total image number: 4

Plant: Potato (Solanum tuberosum) (Solanaceae) Back to List
Disease/Disorder: Black leg
Causal agent: Erwinia carotovora (bacterium)
Signs:
Symptoms: Root and lower stem rot.
Total image number: 4

Plant: Pepper (Capsicum annum) (Solanaceae) Back to List
Disease/Disorder: Bacterial spot
Causal agent: Xanthomonas campestris pv. vesicatoria (bacterium)
Signs: bacterial streaming
Symptoms: water-soaked spots on leaves with yellow halo when backlit.
Total image number: 4

Plant: Pepper (Capsicum annum) (Solanaceae) Back to List
Disease/Disorder: Blossom-end rot
Causal agent: calcium deficiency
Signs:
Symptoms: medium brown soft area at the bottom or on the side near the bottom of the fruit
Total image number: 3

Plant: Pepper (Capsicum annum) (Solanaceae) Back to List
Disease/Disorder: herbicide injury
Causal agent: "Roundup" 'glyphosate'
Signs:
Symptoms: Yellowing of youngest leaves from the base.
Total image number: 2

Plant: Pepper (Capsicum annuum) (Solanaceae) Back to List
Disease/Disorder: herbicide injury
Causal agent: growth regulator (e.g. 2,4-D)
Signs: none
Symptoms: leaves narrow with parallel main veins, wavy margins and elongated tips.
Total image number: 4

Plant: Pepper (Capsicum annuum) (Solanaceae) Back to List
Disease/Disorder: stem sunscald
Causal agent: abiotic;
Signs: none
Symptoms: tender stems injured by intense sunshine. Outer tissues die and stem can collapse. Secondary, non-pathogenic fungi can colonize dead stem tissue; in this case mostly Curvularia.
Total image number: 4

Plant: Pepper (Capsicum annum) (Solanaceae) Back to List
Disease/Disorder: Southern blight
Causal agent: Sclerotium rolfsii (fungus)
Signs: white fans of fungal mycelium and white to brown, mustard seed-sized survival structures called "sclerotia".
Symptoms: Plant wilts and dies suddenly.
Total image number: 4

Plant: Spinach (Spinacia oleracea) (Chenopodiaceae) Back to List
Disease/Disorder: White rust
Causal agent: Albugo occidentalis (fungus)
Signs: raised, white pustules produce sporangia.
Symptoms: Chlorotic areas appear first followed by raised white pustules that often develop in rings.
Total image number: 11