juiyis, 19IS Ascochyta Clematidina 341 



the leaf than on the upper. A temperature of 23° C. is more favorable 

 for the production of the leaf -spot than a temperature of 10° C. 



(8) The matting of the vines produces a condition most favorable 

 for the spread of the disease. Ventilation can be obtained by support- 

 ing the vines or by planting them far enough apart to prevent matting. 



(9) On the hybrids the disease can be controlled in the forcing frames 

 or in the greenhouse by the use of sprays. In the field, the spraying of 

 hybrids properly supported is of little benefit. 



(10) On C. paniculata spraying with a fungicide checks the disease. 

 In the field the removal of diseased leaves and vines before spraying is 

 of practical value in controlling the disease. 



(11) Sulphur dusted on C. paniculata in large quantities may cause 

 injury. 



(12) A mixture of i pound of laundry soap and 6 pounds of sulphur 

 to 15 gallons of water, when sprayed on cuttings in the greenhouse or 

 on C. paniculata growing in the beds, controlled the disease. 



LITERATURE CITED 

 (i) Arthur, J. C. 



1885. Disease of clematis. In N. Y. State Agr. Exp. Sta. 3d Ann. Rpt., 1884, 



P- 383-385. fig- 5- 



(2) Bos, J. Ritzema. 



1893. Phytomyza affinis Fall., as a cause of decay in clematis. In Insect 



Life, V. 6, no. 2, p. 92-93. 



(3) COMSTOCK, J. H. 



1890. The clematis disease, or nematodes infesting plants. In West. N. Y. 



Hort. Soc. Proc. 35th Ann. Meeting, 1890, p. 7-12. 



(4) Gloyer, VV. O. 



1914. Stem rot and leaf spot of clematis. In Phytopathology, v. 4, no. i, 



P- 39- 



(5) Green, S. B. 



1906. Ornamental trees, shrubs and herbaceous plants in Minnesota. Minn. 

 Agr. Exp. Sta. Bui. 96, p. 241-350, 108 fig. 



(6) Halsted, B. D., and Kelsey, J. A. 



1903. Fungicides and spraying. In N. J. Agr. Exp. Sta. 23d Ann. Rpt., 

 [i9oi]/o2, p. 415-417, pi. lO-II. 



(7) Klebahn, Heinrich. 



1891. Zwei vermutlich durch Nematoden erzeugte Pflanzenkrankheiten. In 



Ztschr. Pflanzenkrank., Bd. i, p. 321-325. 



(8) Morel, F. 



1903. La maladie noire des clematites. In Rev. Hort., ann. 75, no. 15, p. 



364-365- 



(9) Prilueux, E. E., and Delacroix, Georges. 



1894. Maladies bacillaires de divers vegetaux. In Compt. Rend. Acad. Sci. 



[Paris], V. 118, no. 12, p. 668-671. 



(10) S., E. 



1898. Clematises dying. In Garden, v. 54, no. 1394, p. 99. 



(11) Saccardo, p. a. 



1884-1906. Sylloge Fungorum ... v. 3, p. 396, 1884; v. 10, p. 301, 1892; v. 

 14, p. 942, 1899; v. 18, p. 347-348, 1906. Patavii. 



