Holb, I. J. “Effect of Pruning on Disease Incidence of Apple Scab and Powdery Mildew in Integrated and Organic Apple Production”. International Journal of Horticultural Science 11, no. 1 (March 14, 2005): 57–61. Accessed September 25, 2021. https://ojs.lib.unideb.hu/IJHS/article/view/559.