Letter | Published:

Host Induced Change in the Morphology of a Powdery Mildew Fungus

Naturevolume 212pages540541 (1966) | Download Citation



BLUMER'S1 work showed that the powdery mildews produce two types of conidiophore, those of the Erysiphe polygoni DC. type, producing one mature conidium in a day, and those of the Erysiphe cichoracearum DC. type, producing a chain of between two and eight mature conidia in a day. Childs2 later referred to these two powdery mildews as the non-chain forming and the chain forming types respectively. He showed that the former had a single peak period of spore liberation between 1000 and 1400 h, while the latter had a more complex diurnal cycle of spore liberation with two peaks, the first between 0600 and 0800 h and the second between 1400 and 1600 h. There is no evidence that the fungus which produces one type of conidiophore can produce the other in any circumstances.

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  1. 1

    Blumer, S., Beitr. Kryptogamenfl. Schweiz., 7, 1 (1933).

  2. 2

    Childs, J. F. L., Phytopathology, 30, 65 (1940).

  3. 3

    Peries, O. S., Ann. Rep. Rubb. Res. Inst. Ceylon 1955, 70 (1956).

  4. 4

    Young, H. E., Quart. J. Rubb. Res. Inst. Ceylon, 26, 13 (1949).

  5. 5

    Peries, O. S., Ann. Rep. Rubb. Res. Inst. Ceylon 1964 (in the press).

  6. 6

    Schmitt, J. A., Mycologia, 47, 688 (1955).

  7. 7

    Yarwood, C. E., J. Agric. Res., 52, 645.

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  1. Rubber Research Institute of Ceylon, Dartonfield, Agalawatta, Ceylon

    • O. S. PERIES


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