First Report of Brown Discoloration of <em>Agaricus bisporus</em> Caused by <em>Pseudomonas agarici</em> in Southern Italy

Abstract

From superficial brown discolorations on the caps and stalks of deformed sporophores of Agaricus bisporus, bacteria were consistently isolated. On the basis of biochemical, nutritional and pathogenic characteristics, both on tissue blocks and on whole sporophores of A. bisporus, the above bacteria were identified as strains of Pseudomonas agarici.