@book{221,
	author = {Cuéllar Cruz, José Baldomero.},
	title = {Control químico de la cenicilla del durazno (Sphaerotheca pannosa (Wallr.)Lev. var. persicae Wor.)en la región de Jarahuro, Mich. México},
	publisher = {El autor,},
	year = {1989},
	address = {Chapingo, Méx. :}
}