Lee: Citrus-canker Control 
19, 2 
171 
18. Wester, P. J. A serious disease on citrus fruits. Philip. Agr. Rev. 7 
(1914) 423. 
19. Idem. Additional observations on the citrus fruits in the Philippines. 
Philip. Agr. Rev. 10 (1917) 105. 
20. Idem. Notes on Philippine citrus fruits. Philip. Agr. Rev. 12 (1919) 
69. 
21. Wolf, Frederick A. Citrus canker. Journ. Agr. Res. 6 (1916) 95. 
22. Yothers, W. W. Spraying for whiteflies in Florida. Circular U. S. ( 
Dept. Agr. Bur. Ent. 168 (1913). 
