FUNGICIDES 



373 



TIME IN HOURS - RECIPROCAL SCALE 



FiGTTRE 146. Time, temperature, and fungicide dosage curves for spore germination. 

 A, Time-germination curves at different temperatures for Sderotinia frudicola spores 

 in water. B, As A except in presence of fungicides, dosage in micrograms Cu per sq cm, 

 21° C (70° F). C, Time-LD50 curves for different fungicides against Alternaria solani 

 showing difference of slope. D, Time-LD50 curves for Bordeaux mixture on different 

 fungi. 



