Abstract
Abstract A description is provided for Microsphaera palczewskii . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Powdery mildew of ornamental plants. Mycelium, conidiophores, conidia and ascomata form a covering of damaged green parts of the host which is first white, then dirty-grey. Infected part lose their shape. If infection levels are high, the plants may lose their ornamental qualities. HOSTS: Caragana arborescens, C. boisii, C. brevispina, C. decorticans, C. fruticosa, C. manchurica, C. microphylla, C. mollis, C. spinosa, C. ussuriensis, Robinia pseudacacia . [Type species - Caragana arborescens ] GEOGRAPHICAL DISTRIBUTION: Asia (temperate areas only): China, Kazakhstan, Russia (Altai, Russian far east, southern Siberia), Turkmenistan. Europe (introduced): Belarus, Germany, Latvia, Lithuania, Poland, Rumania, Russia (European part), Slovakia, Spain, Sweden, Ukraine. TRANSMISSION: By wind-dispersed conidia. The rôle of ascospores in disease transmission is unknown, although it has been supposed that they can cause the initial stage of the disease. Infection can however also be through colonies surviving in host buds.
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