Diseases of cereal and forage Diseases of cereal and forage crops in the United States in 1919 diseasesofcereal08john Year: 1920 40 the main offender in the case of wheat scab. Hence the fame factors were operative on rye as on wheat, as previously presented. As to the relation of severe cases of scab on rye and previous crops on these fields, it is particularly noteworthy that tvo rye , one in Minnesota and one in Illinois, where unus- ually high percentages of scab were noted; ''~( and 'O. respectively, both had been in corn the preceding year. Com- paratively high perctntag
Diseases of cereal and forage Diseases of cereal and forage crops in the United States in 1919 diseasesofcereal08john Year: 1920 40 the main offender in the case of wheat scab. Hence the fame factors were operative on rye as on wheat, as previously presented. As to the relation of severe cases of scab on rye and previous crops on these fields, it is particularly noteworthy that tvo rye , one in Minnesota and one in Illinois, where unus- ually high percentages of scab were noted; ''~( and 'O. respectively, both had been in corn the preceding year. Com- paratively high of scat on rye were also noted in Missouri where the previous crop had teen corn. llo outstanding casus of resistance were reported, nor were any other practicable con- trol measures. rig. 10. Estimated percentage reduct:c :. n yield from seal :>f rye 1919. Anthracnose caused by Colletotrichum cereale Manns. Anthracnose on rye was reported as having occurred in a number of im- portant rye producing states in 1919> some states in considerable ami-unts, The disease was definitely reported from Llinnesota, V/isconsin, Iowa, Alisscuri, Illinois, Indiana, Ohio, Pennsylvania, Virginia, Tennesstae and Alabama. It was reported as severe in southern Virginia, Alabama, southern Indiana and dif- ferent parts of Iowa and Ohio, In Alabama it was said to be the 'worst disease of rye in the state' by E. F. Hopkins. In the Experiment Station plots at Auburn the disease was re- ported as unusually severe by G. L. Peltier. He has Kindly furnished the fol- lowing data, Table 11. Relative amounts of anthracnose in certain varieties of Auburn, Alabama, Fiay 20, 1919- Plot ⢠Ko. ⢠Varieties, Percentage ;⢠anthracnose :; Plot Ko. Varieties Percentage antnracnose 1 Florida 25-40 ; â I Geoi'gia '25 2 Rosen Piedmont 50 3 Abruzzi 25 .Florida 25 4 Ordinary 50 : : Tuscaloosa 25
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