Growth of Various Powdery Mildew Fungi on the Barley Leaves Infected Preliminarily with the Barley Powdery Mildew Fungus

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Abstract
Young colonies of the barley powdery mildew fungus growing on barley leaves were rubbed off with water-drenched absorbent cotton and then the leaves were inoculated secondarily with the powdery mildew fungi collected from wheat and Agropyron ciliare Franch, var. minus Ohwi and 49 powdery mildew fungi from dicotyledons. The haustoria of the barley powdery mildew fungus, torn off from the hyphae and remaining in the barley epidermal cells, survive for many days. Out of the 51 fungi, 45 grew close to the colonies of the barley fungus on the barley leaves and 30 produced conidia, though the hyphal growth and conidial formation were different in their degree according to the fungi. The powdery mildew fungi from wheat, Agropyron, cucumber, Physalis alkekengi L. var. francheti Hort. form. bunyardii Makino, etc. grew nearly as well as on their respective proper host plants at least for the first several days after inoculation. Some dicotyledonous species, such as Plantago asiatica L., Lycium chinense Mill., Euonymus japonicus Thunb., etc., were also proved to be susceptible to some secondarily inoculated fungi. For example, the powdery mildew fungi from cucumber, buckwheat and barley produced conidia on Lycium, but neither the cucumber fungus nor barley fungus grew at all on buckwheat.

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