Studies on Fungicides — II 



17 



spores is based on a low-power microscopic field of 1575 microns diameter. 

 Here, as can be seen, it is not advisable to have a spore concentration 

 greater than 50 spores per field. 



TABLE 2. Spore-Conoentration and Germination Relations for Botrytis allii 



in Water 



(80 per cent sterile lake water, 20 per cent tap water, 21° C.) 



The relations of spore concentrations to the kind of water, for the conidia 

 of Botrytis allii and Cephalothecium roseum, respectively, are shown in 

 tables 3 and 4. For Botrytis allii lake water is seen to be the most suit- 



TABLE 3. Spore-Concentration and Water Relations for BoTRYns allii 

 (Percentage germination at 21° C.) 



TABLE 4. Spore-Conoentration and Water Relations for Cephalothecium roseum 

 (Percentage germination at 21° C.) 



