Susceptibility of Yellow Starthistle to Selected Plant Pathogens

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Abstract
Susceptibility of the widespread weed yellow starthistle (Centaurea solstitialis) to several plant pathogens was investigated. Starthistle plants developed symptoms from disease incited by Fusarium oxysporum f. sp. carthami, Verticillium dahliae, Phytophthora spp., Botrytis cinerea, and Sclerotinia sclerotiorum. Except with B. cinerea, diseases incited by the pathogens were frequently lethal to the plants. Alfalfa (AMV), lettuce (LMV), and turnip (TuMV) mosaic viruses were transitted to starthistle plants by aphids and mechanical inoculation. Mosaic, leaf abnormalities, and moderate to severe stunting were common symptoms induced by the viruses. Some plants infected with LMV or TuMV died in the rosette stage. TuMV had the most adverse effect on starthistle plants.

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