40 U.S. DEPT. OF AGRICULTURE MISC. PUB. 939 



money for the appointment of special staff to carry out the work en- 

 visaged. In the field of international cooperation, it is perilously 

 easy to envisage grandiose schemes, the initiation, let alone the oper- 

 ation, of which is far beyond the means available. Of course the full- 

 est possible international use should be made of work already in 

 progress, but even the coordination of this involves considerations of 

 time and money, which cannot be overlooked. 



Thus, while few would deny the importance of increasing our 

 knowledge of diseases, of the damage which they are likely to do if 

 they become more widespread, and of the means by which this damage 

 can be avoided, it is vital that the international work involved should 

 be provided with a sound economic background, thus justifying the 

 substantial expenditure involved. 



Literature Cited 



Beattie, R. K., and Diller, J. D. Fifty years of chestnut blight in America. Jour. 

 Forestry 52 : 323-329. 1954. 



Gould, C. J., Eglitis, M., and Doughty, C. C. European rhododendron rust 

 (Chrysomyxa ledi var. rhododendri) in the United States. Plant Dis. Rptr. 

 39:781-782. 1955. 



Gram, E. Barriers and by-passes in plant trade. Ann. Appl. Biol. 42: 76-81. 

 1955. 



Gravatt, G. F., and Parker, D. E. Introduced tree diseases and insects. U.S. 

 Dept. Agr. Yearb. Agr. 1949: 446-^51. R.A.M., p. 625. 1949. 



Giissow, H. T. Plant quarantine legislation — a review and a reform. Phyto- 

 pathology 26 : 465-^82. 1936. 



Ling, L. Digest of plant quarantine regulations, F.A.O. Rome. 164 pp. and 

 subsequent supplements. 1952. 



McCubbin, W. A. Preventing plant disease introduction. Bot. Rev. 12 : 101-139. 

 1946. R.A.M., p. 320. 1946. 



. The plant quarantine problem : A general review of the biological, legal, 



administrative and public relations of plant quarantine with special refer- 

 ence to the United States situation. Chronica Botanica Co., 255 pp. 1954. 



Moore, W. C. Principles underlying plant import and export regulations. Plant 

 Path. 1: 15-17. 1952. 



. The development of international co-operation in crop protection. Ann. 



Appl. Biol. 42: 67-72. 1955. 



Morgan, F. D., and Byrne, J. The desirability of international quarantine meas- 

 ures for exports and imports of timber and timber products. Brit. Comm. 

 Forestry Conf., 7 pp. 1957. 



Orton, W. A., and Beattie, R. K. The biological basis of foreign plant quaran- 

 tines. Phytopathology 13: 295-306. 1923. 



Riker, A. J. The discovery of important diseases before they move from one 

 country to another. Phytopathology 47 : 388-389. 1957. 



Sherman, R. W. Co-operation of world tourists sought in plant quarantine en- 

 forcement. FAO Plant Protect. Bui. 5: 89-90. 1957. 



Soraci, F. A. Redefinition of the principles of plant quarantine and their rela- 

 tion to the current problems. Phytopathology 47 : 381-382. 1957. 



Wheeler, W. H. The movement of plant pathogens. Phytopathology 47 : 386-388. 

 1957. 



