CONTENTS, 



Pago. 



Additions t(i our knowlodiro of life histories 9 



Kiiphorhia rust {rn»ii!/C('>t eiiphurhiiv C. ami 1*. ) {( 



SunHower rust ( I'uccima JielUmihi Sch w. ) 11 



Crown rust of oats {Puccmid rhdmni [Pers.] Wi4ttsl. ) \?> 



Segregation of host ])lants 14 



Blaek stem rust of Agropyron and Klynius 15 



Orange leaf rust of Agropyron and P21ymus 17 



Black stem rust of Agrosth alha vulgaris 17 



Rust of Chloris ( I'licrinia chJoridix Diet. ) 18 



Rusts of willow and cottonwood ( Melampsora) 18 



Winter resistance of the uredn 19 



Uredo of Kentucky bluegrass rust {Purrinui poarum Niels. ) 20 



Uredo of Piirriiiiii ninntducns-ix Ell 20 



Emergency adaptations 21 



Piicciniii re.vaiis Farl 22 



Experiments with Lei)to-uredine;e 25 



Rust of cocklebur ( Pucciida .ranthii 8ch w. ) 26 



Rust of velvet leaf ( Pvrrinia Jieterospora B. and C. ) 26 



Perennial si)ecies 27 



^lu'UVniin tnhi'rculatinn E. and K 27 



Rust of Peuci'(hun(iii ficniciddreum 28 



Description of plates ' 32 



7 



