Home › Authors › William J. Frederich 👤 William J. Frederich 2 books Books by William J. Frederich Further studies on the relativ Further studies on the relative susceptibility to citrus canker of different species and hybrids of the genus Citrus, including the wild relatives 1924 Relation of environmental fact Relation of environmental factors to citrus scab caused by Cladosporium citri Massee 1924