MICHIGAN ACADEMY OF SCIENCE. 



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TABLE XYI.— FUNGICIDAL VALUE OF ATOMIC SULFUR. 



The average germination in the case of this spray was about 

 1%, showing that if it is possible to use it on the foliage without 

 injury, it might prove effective. 



However, the writer cannot say as to the danger of its use on 

 cucumbers. 



TESTS WITH POTASSIUM DICROMATE.. 



This chemical was used merely as an experiment, without any 

 idea as to whether it would be effective or whether it could be used 

 on the plant. This was due to the fact that the work was all done 

 on the presumption that Bordeaux mixture was ineffective and 

 every possible fungicidal preparation was tried in an effort to se- 

 cure something which would kill the spores of the fungus. 



The first set of cover slips used with this chemical were sprayed 

 with a .5% solution of it in water. 



TABLE XVII.— TESTS WITH .5% POTASSIUM DICHROMATE. 



The average germination in this case was about 4%, which would 

 mean that it might prove an effective agent of control if the vines 

 could stand an application of the chemical. 



TESTS WITH POTASSIUIM DICHROMATE. 



In this set the dilution was made stronger, being 1% instead of 

 .5% as before. 



