90 BULLETIj^ 957^ U. S. DEPARTMENT OF AGEICULTUEE. 



A few years delay will mean serious loss. It is a simple and practical precaution to 

 destroy the currant and gooseberry bushes before they destroy the pines. The demon- 

 strated effectiveness of this method of control justifies pine owners in uprooting currant 

 and gooseberry bushes on a large scale (24). 



Those who do not do this in their pine lands and for a distance of 

 200 to 300 yards outside will be likely to see a valuable asset turned 

 into a liability. In areas where the white pine is an important tree 

 cultivated Ribes should not be planted. A number of States already 

 have laws prohibiting such planting without permission from the 

 State authorities except in areas designated and set apart as '^cur- 

 rant-growing districts." 



LITERATURE CITED. 



(1) Aderhold, Rudolf. 



1907. Versuche liber den Einfluss haufigen Regens uaf die Neigung zur 

 Erkrankung von Kulturpflanzen. In Arb. K. Biol. Anst. Land- u. 

 Forstw., Bd. 5, Heft 6, p. 354-360, 1 fig. 



(2) Amendment of regulations relating to importation and shipment of currants 



1919. and gooseberries. In Agr. Gaz. Canada, v. 6, no. 6, p. 526-527. 



(3) Arthur, J. G. 



1907. Uredinacese. In No. Amer. Flora, v. 7, pt. 2, p. 97-127. 



(4) Barclay, Arthur. 



1887. On the life history of a new Aecidium on Strobilanthes Dalhousianus 

 Clarke. In Sci. Mem. Med. Officers Army India, pt. 2, 1886,' p. 

 15-27, pi. 2-3. 



(5) Bean, W. J. 



1914. Trees and Shrubs Hardy in the British Isles, v. 2. London. 



(6) BONDARTSEV, A. S. 



1910. Les parasites vegetaux des plantes cultivees et sauvages, recueillis 

 dans le gouvernement de Koursk en 1901, 1903-1905. In Acta 

 Horti Petropolitani, t. 26, fasc. 1, p. 1-25. In Russian. 



(7) Brefeld, Oscar. 



1891. Untersuchungen aus dem Gesammtgebiete der Mykologie. Heft 9. 

 Die Hemiasci und die Ascomyceten. 156 p., 4 pi. Miinster i W. 



(8) BUNYARD, E. A. 



1917. A revision of the red currants, hi Gard. Chron. s. 3, v. 62, no. 1613, 



p. 205-206, fig. 78-79; no. 1614, p. 217, fig. 82-83; no. 1615, p. 232, 

 fig. 88-89; no. 1616, p. 237, fig. 90-91. 



(9) BUTTNER, G. 



1906. tJber Vertilgung des Weymouthskiefern-Blasenrostes. In Mitt. 

 Deut. Dendrol. Gesell., No. 15, p. 232-233. 



(10) Carleton, M. a. 



1893. Studies in the biology of the Uredineee. I. In Bot. Gaz., v. 18, no. 

 12, p. 447-457, pi. 37-39. 



(11) 1903. Culture methods with Uredineae. In Jour. Appl. Micros, and Lab. 



Methods, v. 6, no. 1, p. 2109-2114. 



(12) Clinton, G. P. 



1918. Artificial infection of Ribes species and white pine with Cronartium 



ribicola. 'In Amer. Plant Pest Com. Bui. 2, ed. 2, p. 14-15. 



