DISEASES OF CROPS 223 



REFERENCES 



' Diseases of Tropical Plants." Cooke. 



' Fungous Diseases of Plants." Duggar. 



'Spraying of Plants." Lodeman. 



'Minnesota Plant Diseases." Freeman. 



1 Diseases of Economic Plants." Stevens and Hall. 



' Diseases of Cultivated Plants and Trees." Massee. 

 California Expt. Station Bulletin No. 262. "Citrus Diseases of Florida and Cuba 



Compared with California." 

 Michigan Expt. Station (Technical Bulletin No. 20). "Control of Root Knot Nema- 



tode." 

 New Jersey Expt. Station Circulars: 



44. "Diseases of Apples, Pears and Quinces." 



45. " Diseases of Peach, Plum and Cherry." 



Pennsylvania Expt. Station Bulletin No. 36. "Collar-Blight and Related Forms of 



Fire Blight." 

 U. S. Dept. of Agriculture Bulletins: 



64. " Potato Wilt and Other Diseases." 



203. "Field Studies of the Crown Gall of Sugar Beets." 

 Farmers' Bulletin, U r S. Dept. of Agriculture: 



544. " Potato Tuber Diseases." 



