Powdery mildew in the orchard
Cunningham, G.H.
Powdery mildew in the orchard - Wellington 1926 - 1-8 p. - New Zealand Department of Agriculture. Bulletin No. 112 .
Powdery mildew in the orchard - Wellington 1926 - 1-8 p. - New Zealand Department of Agriculture. Bulletin No. 112 .