UNLABELLED Leaf rust, caused by Puccinia triticina, is the most common rust disease of wheat. The fungus is an obligate parasite capable of producing infectious urediniospores as long as infected leaf tissue remains alive. Urediniospores can be wind-disseminated and infect host plants hundreds of kilometres from their source plant, which can result in wheat leaf rust epidemics on a continental ...

Wilbrink' s-boric acid-cephalexin agar medium (WBC) was developed and tested for iso­ lating Xalllh omonas campeslris pv. IIndulosa, the causal agent of bacterial leaf streak of wheat or black chaff. from seed . WBC medium is Wilbrink's medium that has been modified by adding 0.75 gil of boric acid and 10 mg/l of cephalexin. Compared to the standard Wilbrink's medium, average plating efficiency...