

DAMPING-OFF IN FOREST NURSERIES. 97 



(96) Norton, J. B. 



1913. Methods used in breeding asparagus for rust resistance. U. S. 

 Dept. Agr., Bur. Plant Indus. Bui. 263, 60 p., 4 fig., 18 pi. 



(97) Pearson, G. W. 



1906. Two diseases of pines. In 37th Ann. Rpt. Nebr. Hort. Soc., 

 1906, p. 230-232. 



(98) Peltier, George L. 



1916. Parasitic Rhizoctonias in America. 111. Agr. Exp. Sta. Bui. 

 189, p. 283-390, 24 fig. Bibliography, p. 386-390. 

 Peters, L. 



(99) 1910. Eine haufige Stecklingskrankheit der Pelargonien. In Garten- 



flora, Jahrg. 59, Heft 10, p. 209-213, pi. 1582. 



(100) 1911. Ueber die Erreger des Wurzelbrandes. In Arb. K. Biol. Anst. 



Land-u. Forstw., Bd. 8, Heft 2, p. 211-259, 12 abb. (Unter- 

 suchungen liber die Krankheiten der Riiben, von W. Busse. 5.) 



(101) Pettis, Clifford Robert. 



1909. Problems in nursery practice. In Proc. Soc. Amer. Foresters, 

 v. 4, no. 1, p. 42-49. 



(102) Pierce, Roy G., and Hartley, Carl. 



1919. Relative importance of Pythium and Rhizoctonia. in coniferous, 

 seed beds. (Abstract.) In Phytopathology, v. 9, no. 1, p. 50. 



(103) Poole, R. F. 



1918. Report of celery investigation. In N. J. Agr. Exp. Sta. 38th 

 Ann. Rpt. 1916/17, p. 536-539. 



(104) Prillieux, Ed. 



1895. Maladies des Plantes agricoles et des Arbres fruitiers et fores- 

 tiers causees par des Parasites vegetaux. T. 1. Paris. 



(105) Rankin, W. Howard. 



1918. Manual of Tree Diseases, xx, 398 p., 70 fig. New York. 



(106) Rathbun, Annie E. 



1918. The fungous flora of pine seed beds. In Phytopathology, v. 8, 

 no. 9, p. 469-483. Literature cited, p. 483. 

 Reinking, Otto A. 



(107) 1918. Philippine economic-plant diseases. In Pkilippine Jour. Sci.„ 



v. 13, sect. A, no. 4-5, p. 165-274, 43 fig., 22 pi. 



(108) 1919. Philippine plant diseases. In Phytopathology, v. 9, no. 3, p. 



114-140. 

 Retan, George A. 



(109) 1915. Charcoal as a means of solving some nursery problems. In 



Forestry Quart., v. 13, no. 1, p. 25-30. 



(110) 1918. Nursery practice in Pennsylvania. In Jour. Forestry, v. 16, 



no. 7, p. 761-769. 



(111) Rogers, Stanley S. 



1913. The culture of tomatoes in California, with special reference 

 to their diseases. Cal. Agr. Exp. Sta. Bui. 239, p. 591-617, 13 fig. 



(112) Rolfs, F. M. 



1915. Angular leaf-spot of cotton. S. C. Agr. Exp. Sta. Bui. 184, 

 30 p., 9 pi. Literature cited, p. 30. 



(113) Rolfs, P. H. 



1913. Tomato diseases. Fla. Agr. Exp. Sta. BuL 117, p. [33]-48, 

 fig. 4-5. 

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