632 Zaw P Zawolek, Marek W , 1955-. A Physical theory of focus development in plant disease. / M.W. Zawolek and J.C. Zadoks. -- Wageningen Agricultural University., 1989. [9], 229, [2] p. : Ill. , tab. ; 25 cm, A la cabeza de la portada : ´´Wageningen Agricultural University Papers 89-3(1989) Bibliografía p. CONTINUA FICHA: 2