34 



James ( !. Horsfall 







Figure 6. germinating urediniospores of clover-rust fungi, uromyces 



TRIFOLII HYBRIDI (a) AND UROMYCES TRIFOLII FALLENS (b), SHOWING THE 

 TOXIC EFFECTS OF SULFUR AND COPPER FUNGICIDES 

 a, Check; b and c, in copper-lime dust; d, e, and /, in Bank's colloidal sulfur dust; g, in 



Kolodust 



was less in 1927 than in 1928, as was the case with sulfur 

 this fungicide for both rusts are given in table 15. 



The data on 



TABLE 15. 



Effect of Copper-Lime Dust on Urediniospore Germination of Uro- 

 myces Trifolii Hybridi and Uromyces Trifolii Fallens 



Uromyces trifoh- hybridi 



Uromyces trifolii fallens 



