In Northern Coahuila, it has been confirmed that the leaves of the pecan tree can have spots or lesions caused by M. caryigena that, when ripe, cause the leaves to fall .
En el norte de Coahuila, se ha consignado que las hojas del nogal pueden tener manchas o lesiones provocadas por M. caryigena, que al madurar provocan la caída del follaje .