Boesewinkel, H.J. 1981: The identity of powdery mildew of citrus. Nova Hedwigia 34: 731-741.
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| Boesewinkel, H.J. 1981: The identity of powdery mildew of citrus. Nova Hedwigia 34: 731-741. |
| Boesewinkel, H.J. 1981: The identity of powdery mildew of citrus. Nova Hedwigia 34: 731-741. |