Use of the mushroom tissue block rapid pitting test to detect brown blotch pathogens.

Isolates of an Arthrobacter species known to produce a positive host pathogenicity test were evaluated by the mushroom tissue block rapid pitting test. All 11 isolates of the Arthrobacter species yielded a positive test response. The time required for a positive test was the same for Pseudomonas tolaasi and the Arthrobacter species.