New YorkK AGRICULTURAL EXPERIMENT STATION, 131 
MEANS OF PREVENTION, 
Little can be said at present concerning special means of pre- 
vention to be adopted for Rhizoctonia diseases. Plants growing 
under the most favorable conditions of moisture, temperature, 
and nutrition will probably show marked resistance to the attacks 
of such diseases, so that good sanitary conditions are of the first 
importance. An excess of moisture and the presence of freshly 
decaying plant products in the soil will unquestionably favor the 
disease. Particularly in the propagating and forcing benches is 
a frequent change of soil advisable. The fungus grows well upon 
acid media, and liming of the soil is therefore well; but this of 
itself is not thoroughly effective. If the fungus should become 
a serious pest in greenhouses, it may sometimes prove practicable 
’ to sterilize the soil with steam or with hot water. 
