POTATO FAILURES. 
IQ 
When a field has become thoroughly infected with the 
disease it will remain in the soil a number of years. 
The nature of the disease indicates that it may be com¬ 
batted by preventive means which consist in planting clean 
seed in clean soil. Seed potatoes should be carefully sort¬ 
ed, disinfected and planted on land that is well underdrain¬ 
ed. Then by practicing a long and systematic rotation of 
crops, the soil may be prevented from becoming badly in¬ 
fected with the disease. 
The fungus may spread from a few diseased potatoes 
in a sack or bin and in a short time render the entire lot 
worthless for seed. 
In our experiments diseased seed potatoes treated'with 
corrosive sublimate and sprayed with Bordeaux mixture 
gave an increase in yield [of forty per cent over untreated 
seed and unsprayed plants. The soil used in the experi¬ 
ments was heavy, poorly drained and infected wifh Rhizoc- 
tonia. A lighter, well drained soil free from the disease 
undoubtedly would have given still better results. The 
formalin treatment also gave encouraging results. 
