16 MISCELLANEOUS PUBLICATION NO. 725, U.S. DEPARTMENT OF AGRICULTURE 
Campbell, W. A. 
1948. Phytophthora cinnamomi associated with the roots of 
littleleaf-diseased shortleaf pine. U. S. Bur. 
Plant Indus., Soils, and Agr. Engin., Plant Dis. 
Rptr. 32: 472. [Processed.] 
Campbell, W. A. 
1948. Search for root killer as the cause of littleleaf 
disease of pine. Forest Farmer 8 (3): 4, illus. 
Campbell, W. A. 
1949. Littleleaf--Recent developments in the search for 
its cause. Va. Forests 4 (4): 2-3, 8, illus. 
Campbell, W. A. 
1949. A method of isolating Phytophthora cinnamomi di- 
rectly from soil. U. S. Bur. Plant Indus., Soils, 
and Agr’. Engin); "Plant Dis Rptrs 5324 134-135. 
[Processed, ] 
Campbell, W. A. 
1949. Needle cast of southern pines. Forest Farmer 9 
(1): 4, 10, illus. 
Campbell, W. A. 
1949. Relative abundance of Phytophthora cinnamomi in 
the root zones of healthy and littleleaf-diseased 
shortleaf pine. Phytopathology 39: 752-753. 
Campbell, W. A. 
1950. New light on the cause of littleleaf. Ga. Forestry 3 
(2)e -S=654allusz 
Campbell, W. A. 
1951. Fungi associated with the roots of littleleaf- 
diseased and healthy shortleaf pine. Phyto- 
pathology 41: 439-446, illus. 
Campbell, W. A. 
1951. The occurrence of Phytophthora cinnamomi in the 
soil under pine stands in the Southeast. Phyto- 
pathology 41: 742-746, illus. 
Campbell, W. A. 
1951. Vertical distribution of Phytophthora cinnamomi in 
the soil under littleleaf-diseased shortleaf pine. 
U. S. Bur. Plant Indus., Soils, and Agr. Engin., 
Plant Dis. Rptr. 35: 26-27, illus. [Processed.] 
Campbell, W. A. 
1952. A root parasite and soil conditions in relation to 
littleleaf disease. Assoc. South. Agr. Workers 
Proe.49: 4 91-9Zze 
Campbell, W. A., and Copeland, Otis L., Jr. 
1953. Littleleaf disease. Amer. Forests 59 (6): 23, 51, 
illus. 
Campbell, W. A., and Copeland, Otis L., Jr. 
1954. Littleleaf disease of shortleaf and loblolly pines. 
U.S. Depts Agr 2 Cire (940) 41 pps, villes. 
Campbell, W. A., Copeland, Otis L., Jr., and Hepting, 
George H, 
1953. Littleleaf in pines in the Southeast. U. S. Dept. Agr. 
Yearbook (Plant Diseases) 1953: 855-857. 
Campbell, W. A., Copeland, Otis L., Jr., and Hepting, George H, 
1953. Managing shortleaf pine in littleleaf disease areas, 
U. S. Forest Serv., Southeast. Forest Expt. Sta. 
Paper 25, 12 pp., illus. [Processed.] 
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