MtCHlGAN ACADEMY OF SCIKNCE. 



mi 



TABLE No. 5 

 Summary of facts shown in Tabic 4 



From the above tables it is evident that the stripe disease is widely dis- 

 tributed in native as well as introduced seed. It i.s noteworthy, however, that 

 the disease is present in liislier percentages in the various pedigreed varieties 

 than in most of tlie common run of barley. It is important to note that 64% of 

 the fields showed the disease present in percentages of more than 1%, and 

 indeed the average infestation of fields Of this class is more than 7%. 



In view of the fact that this disease prevents the formation of a normal 

 head, the percentage noted in the tables would indicate very well the actual 

 percentage of loss to the farmer. Hence, barley stripe offers excellent oppor- 

 tunities for extension work and has assumed an Importance even greater than 

 the smut diseases. 



Net Blotch, {nelminthosporium teres). This disease was of no particular 

 consequence thi'oughout the state and was not cutting down the yield to any 

 appreciable extent. 



Rye : Rye diseases were not found especially prevalent in 1918. The 

 number of heads affected M'ith ergot was extremely small in the fields where 

 rye did not follow rye. The percentage of infection was high in the case of 

 vohuiteei- rye and especially high when rye grains grew in wheat fields. It 

 was not unusual in such heads to find two-thirds of the spikelets bearing 

 .sclcrotia. 



TABLE No. 6 

 Survey of Rye Diseases 



*One field showing S5 % of the heads affected was found — Otsego Co. 

 **Smut in rye was discovered in Jackson, (Calhoun and Leelanau Counties varying 

 from a trace to 25 %. 



Some suggestions in explanation of this condition may be advanced. 

 (1) The rye may have been volunteer rye and hence showed the amoi\nt of 

 infection common to volunteer rye, since near such rye wintered sclerotia are 



