PLANT DISEASES 299 



3. Bread mold. 



MATERIAL : Tumblers ; stale bread ; small pieces of cardboard ; hand 

 lenses ; compound microscope. 



Dip some stale bread in water, place it in a tumbler, and cover 

 with a piece of cardboard. Let it stand in a warm place for from 

 three days to a week. Remove the bread and notice the grayish 

 white mass of mold which covers it. Examine this under a hand 

 lens, noticing the mycelium. The dark color is due to the formation 

 of sporangia. Mount some of the fungus in a drop of water under 

 the microscope, and notice the mycelium, sporangia, and spores. 



REFERENCES 



DUGGAR, B. M. Fungous Diseases of Plants. Ginn and Company. 

 FREEMAN, E. M. Minnesota Plant Diseases. Webb Publishing Company. 

 STEVENS, F. L., and HALL, J. G. Diseases of Economic Plants. The 



Macmillan Company. 

 The Development of Farm Crops Resistant to Disease, Year Book of the 



United States Department of Agriculture, 1 908. 

 Wilt Disease of Cotton, Watermelon, and Cowpea, Bulletin 77, Division 



of Vegetable Pathology, United States Department of Agriculture. 

 The Rusts of Grain in the United States, Bulletin 216, Bureau of Plant 



Industry, United States Department of Agriculture. 

 Cotton Wilt, Farmers' 1 Bulletin 133, United States Department of 



Agriculture. 

 The More Important Insect and Fungous Enemies of the Fruit and Foliage 



of the Apple, Farmers' Bulletin 392, United States Department of 



Agriculture. 

 Potato Tuber Diseases, Farmers'' Bulletin 544, United States Department 



of Agriculture. 

 The Smuts of Wheat, Oats, Barley, and Corn, Farmers' Bulletin 307, 



United States Department of Agriculture. 

 Spraying Peaches for the Control of Brown Rot, Scab, and Curculio, 



Farmers' 1 Bulletin 440, United States Department of Agriculture. 



