260 FUNDAMENTALS OF AGRICULTURE. 



for the conservation of moisture is the most important 

 of these. 



EXERCISE. Try to find some field crops affected with disease. 

 Bring specimens to school and be prepared to tell your teacher the 

 diseases and how to prevent them. 



REFERENCES FOR COLLATERAL READING. 



PLANT DISEASES : 



Yearbooks of the U. S. Dept. of Agriculture : 



1900 Fungus diseases of forest trees. 



1908 The development of farm crops resistant to disease. 

 Farmers' Bulletins, Nos. : 



91 Potato diseases and treatment. 



231 Spraying for cucumber and melon diseases. 



243 Fungicides and their uses in preventing diseases of 

 fruits. 



244 Fumigation for nursery stock. 



250 The prevention of wheat smut and loose smut of oats. 



267 Apple bitter rot. 



284 Insect and fungus diseases of the grape east of the 

 Rocky Mountains. 



316 Potato scab. 



333 Cotton wilt. 

 Experiment Station Bulletins, Nos. : 



54 Illinois Spraying apple trees with special reference to 

 apple scab fungus. 



69 Illinois Apple rots in Illinois. 



91 Florida Tomato diseases. 



121 Ohio Diseases of cultivated plants. 



239 N. Y. Cornell Some diseases of beans. 



252 N. Y. Cornell Insect pests and plant diseases. 



!9O3 Connecticut Annual report of the botanist. 

 BOOKS : 



Fungus Diseases of Plants Duggar Ginn & Co., Boston. 



The Spraying of Plants Lodeman Macmillan Co., New York 



City. 



Minnesota Plant Diseases Freeman. 

 Diseases of Plants Tubeuf & Smith Longmans, Green & Co., 



New York Citv. 



