**Click on Image to Enlarge**
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Rust spores (pathogen) |
Rust infested leaf thistle |
Leaf showing infestation by rust |
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T. horridus - early infestation |
Field of thistles |
R. conicus infected head |
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R. conicus larva |
Musk patch - bolting stage |
Thistle Rosette (plumeless) |
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Mine of 1st instar, R. conicus in bract |
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Dr. L. T. Kok, Professor of Entomology, Virginia Tech, Blacksburg, VA