310 Proceedings of Indiana Academy of Science 



TABLE I. Susceptibility of Clovers to Powdery Mildew in the Field, Lafayette, Ind., October 13, 1921. 



♦Numbers following names are those used by the Office of Forage Crop Investigations, U. S. Dept. Agriculture. 



Encouraged by the.se result.s, further work was started this past 

 summer (1922). Seed of 17 varieties of clover grown on the Experi- 

 ment Station farm at Lafayette, Indiana, were sown in individual flats 

 of sterilized soil in the greenhouse. About midsummer the mildew showed 

 up and spread fairly rapidly. In order that all the flats might be uni- 

 formly inoculated, they were dusted with the mildew the latter part of 

 November, atomized and kept covered with moist cloths for several days. 

 The mildew developed rapidly and by the first of December the older 

 leaves of a number of the varieties were white with the mycelium and 

 spores. The plants were then taken from the flats, sorted according to 

 susceptibility, counted and the immune and highly resistant plants were 

 transplanted. The varieties tested and the results obtained are given in 

 table II. 



TABLE II. 



Susceptibility of Varieties of Red Clover, Trifolium jirateme to Mildew, in fircenhousc Tests. 

 December 1, 1922. 



