The Botrytis Blight of Tulips 



337 



It is of little importance to describe at length the growth on other 

 media: sucrose is utilized as a source of carbon apparently as successfully 

 as glucose; on a glucose solution, without mineral nutrition, the growth 

 is very poor; on plain agar and water the growth is sparse and the mycelium 

 tends to spread; but on agar containing a mineral-nutrient solution, with 



Fig. 39. sclerotia of botrytis tulipae 

 As formed in a petri-dish culture on potato agar. Natural size 



no source of carbon, an excellent growth takes place, even better, perhaps, 

 than that on potato-dextrose agar. This indicates that the carbohydrates 

 of the agar itself are being utilized. With oxalic acid as a carbon source, 

 the growth is poor. 



Growth is best on an acid medium, and, all hough no experiments have 

 been made to determine the range of acidity, good development has 



