Studies on Fungicides — III 



47 



TABLE 2. Percentage Germination of Sclerotinia Americana Conidia in Dilute 

 copper-sulfate solutions - . relations of copper-sulfate concentration and 

 Number of Spores 



(Spore ages, 7 and 8 days) 



Milligrams of copper per liter of solution 



Spore-suspension concentration 

 16 



32 



Per cent and type of germination 



These results are shown graphically in figure 2, where the percentage 

 germination is plotted against the concentration of copper. The curves 

 for the four concentrations of spore suspension are drawn. 



o.z o.j o.4- o.s o.6 or o.e 

 M/lLtgrams copper per 6/ter 



Figure 2. germination of conidia of solehotinia Americana in dilute 

 oopper-sulfate solutions: relations of copper concentration and 

 number of spores 



