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Soil-borne pathogens such as  Macrophomina phaseolina  (the causative agent of charcoal rot) and  Phymatotrichum omnivorum  (the causative agent of cotton root rot) contribute to mortality of transplanted guayule ( Parthenium argentatum , Gray) seedlings in southern Texas. In order to select guayule genotypes for resistance to these pathogens, it would be useful to develop reliable greenhouse inoculation procedures for screening guayule seedlings. Twelve-week-old guayule seedlings (`11591', a USDA standard breeding line) were inoculated using two inoculation methods (soil-drenching and root-dipping) in two soil media (field soil and commercial soil mix). Plants were rated for disease severity 2 to 5 months after inoculation and pathogens were re-isolated from diseased plants to establish Koch postulates. The soil drenching technique, using field soil, caused rapid development of disease symptoms that were consistent with re-isolation frequencies of pathogens from the diseased plant tissues.

Techniques for Inoculation of Guayule Seedlings with Two Soil-borne Pathogens