LEAF-SPOT AND BLIGHT OF DIEFFENBACHIA-AMOENA CAUSED BY PSEUDOMONAS-MARGINALIS PV MARGINALIS

Leaf spot and blight of Dieffenbachia amoena caused by Pseudomonas mar ginalis pv. marginalis are described for the first time. Symptoms were noticed during winter on plants in the greenhouse, the first signs we re small, elongated, light brown lesions on the surface of the leaves. As the infection spreads, leaves become completely brown and collapse . The identity of the causal agent was determined by biochemical, nutr itional and pathogenecity tests as well as by comparison of whole-cell protein profiles of the isolates under study with those of type strai ns.