Co-op 19, 20, 21, and 22
Subtitle: four scab-resistant apple selections released for advanced testing
By: [prepared by D.F. Dayton ... et al.]
Contributors: Dayton, D. F.; New Jersey Agricultural Experiment Station.; Purdue University. Agricultural Experiment Station.
Series: Bulletin (University of Illinois at Urbana-Champaign. Agricultural Experiment Station) -- 755; Bulletin (University of Illinois at Urbana-Champaign. Agricultural Experiment Station) -- 755.
Publisher: Agricultural Experiment Station, College of Agriculture, University of Illinois at Urbana-Champaign
Published: 1977
Place of publication: Urbana, Ill
Subjects: Apples -- Varieties; Apples -- Disease and pest resistance -- Genetic aspects.; Apples -- Illinois -- Breeding.