Collecting Powdery Mildew from the Field. Using tweezers, insert infected sample approximately 1-2cm into the agar slope. Screw cap tight for shipping Aim to harvest a nice green leaf, ideally with a single pustule.

Murray and Brennan 2010 Powdery mildew Causal agent Blumeria graminis f.sp. hordei (Bgh) Especially prominent in Southern WA $33M yield loss per annum Millions of dollars loss annually

Mycelium and conidiophore formation Conidal germination and hyphal development Conidal deposition onto susceptible host Cleistothecia production after occurrence of two hyphae of opposite mating types Cleistothecia release ascospores Colonies produce conidia that are dispersed by wind Sexual Cycle Sexual Cycle Asexual Cycle Asexual Cycle Bgh life cycle

Disease control Jayasena et. al Key: 1= very effective, 2=moderately effective, 3= not effective

Agronomic characteristics of malting and feed barley varieties when grown in Western Australia

Disease resistance/ susceptibillity profiles of malting and feed barley varieties when grown in Western Australia