ABSTRACT The experiment of the effect of nitrogen manure dose towards purple blotch disease (Alternaria porri Ell. Cif.) intensity on garlic plant (Allium sativum L.) was purpused to find out the effect of each nitrogen manure dose towards development of purple blotch disease. The experiment was held in November 1992 until January 1993, at Purwodadi village, Purwodadi sub distri…