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Roberts, John W. (John William) , 1882-
Apple scab , Apples Diseases and pests , apples , orchards , fruit trees , plant diseases and disorders , fungal diseases of plants , scab diseases , fungicides , spraying , dusting , spraying equipment , leaf spotting , frogeye leaf spot , leaf blotch , varietal resistance , cultural control , sulfur
- 12 p. : ill. ; 23 cm.
- U.S. Dept. of Agriculture
Organic Roots Collection