Cunningham, G.H. 1923: Powdery mildew, Podosphaera leucotricha (E. and E.) Salm. Its appearance, cause, and control. New Zealand Journal of Agriculture 26: 344-351.

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Cunningham, G.H. 1923: Powdery mildew, Podosphaera leucotricha (E. and E.) Salm. Its appearance, cause, and control. New Zealand Journal of Agriculture 26: 344-351.