50 Levi Otto Gkatz 



damping-off was high. Excess moistures injurious to the parasite were 

 at the same time injurious to the host, but this occurred only in practically 

 saturated soils (tables 10 to 15). 



6. A combination of low temperatures and low moistures greatly delays 

 the rate of damping-off. In some instances the total percentage of 



Per cent of 

 damping-off 



100 ■ 



SO 



60- 



40- 



20 







100 



80 



60 







/Vo damp/nq off 

 at 



o © 



Temperature 5.5-7 



34->fc 



Temperature (Z4. 5-26 



20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 

 Hours after inoculation 



Figure 12. influence of different soil temperatures and soil moistures on 

 rate of damping-off of cabbage seedlings caused by corticium vagum 



(TABLE 14, TRIAL Xl) 



Soil moistures are given as percentages 



diseased plants is also decreased, but not materially so in all these instances 

 (trials VI to XII, tables 9 to 15). 



It was hardly to be supposed that plants growing at a very low tempera- 

 ture would in any way acquire a resistance to further attack of the parasite. 

 The fact that they would not was definitely indicated when those plants 

 kept at 5.5° C. (table 14) for 264 hours after inoculation practically all 

 damped-off within 48 hours after being subjected to a temperature of 

 25° C. Only half of the plants were placed at this temperature at first, 



