Holb, I. J. “Preliminary Study on Micro Area Based Spatial Distribution of Powdery Mildew in an Organic Apple Orchard”. International Journal of Horticultural Science 20, no. 3-4 (September 7, 2014): 35–37. Accessed April 28, 2024. https://ojs.lib.unideb.hu/IJHS/article/view/1131.