Home › Authors › M. A. de Waard 👤 M. A. de Waard b. 1943 ยท 2 books Books by M. A. de Waard Effect of systemic and non-sys Effect of systemic and non-systemic compounds on the in vitro germination of powdery mildew Conidia 1971 Germination of powdery mildew Germination of powdery mildew Conidia in vitro on cellulose membranes 1971