20 MASS. EXPERIMENT STATION BULLETIN No. 283 



Yields of cucumbers were increased more if copper-lime dust was first applied 

 before, rather than after, infection. In Massachusetts, the first application of a 

 copper fungicide should be made, in the field, about July 25. Later applications 

 should be made at weekly intervals. Bordeaux mixture 3:3:50 is a sufficient 

 concentration for use in the field. Bordeaux mixture 1:1:50 prevented infection 

 of greenhouse cucumbers and, because of the possibiHty of copper injury, this 

 is the concentration suggested for use in greenhouses. 



LITERATURE CITED 



1. Adams, J. F. 1928. Diseases of cucurbits. Del. Agr. Expt. Sta. Bui. 



(Ann. Rpt.) 158:40. 

 2 1929. Diseases of cucurbits. Del. Agr. Expt. Sta. Bui. 



(Ann. Rpt.) 162:64. 



3. Angell, H. R., and Hill, A. V. 1931. The longevity of the conidia of certain 



fungi (Peronosporales) under dry conditions. Jour. Counc. Sci. Industr. 

 Res. AustraHa 4:178-181. 



4. Bal, S. N. 1921. Pseudoperonospora cuhensis (B. and C.) Rostow. on 



Trichosanthes dioica Roxb. Univ. Calcutta, Jour. Dept. Sci. 3:1-3, illus. 



5. Blattny, C. 1912. Beitrag zur Frage der Dungimg des Hopfens als Mittel 



gegen Hopfenperonospora {Pseudoperonospora humtdi). Ernahr. 

 Pfianze 24:140-142, illus. 



6. Boyd, Oran Cecil. 1926. The relative efficiency of some copper dusts and 



sprays in the control of potato diseases and insect pests. N. Y. (Cornell) 

 Agr. Expt. Sta. Bui. 451, 68 p., illus. 



7. Chapman, P. J., and Gould, G. E. 1930. Some notes on dusting cucumbers. 



Jour. Econ. Ent. 23:197-202. 



8. Clayton, E. E. 1928. Spraying experiments with bush lima beans. N. Y. 



(State) Agr. Expt. Sta. Bui. 558, 22 p., illus. 



9 1931. Cucumber disease investigations on Long 



Island. N. Y (State) Agr. Ex-pt. Sta. Bui. 590, 20 p., illus. 



10. Clinton G. P. 1905. Downy mildew, or blight, Peronoplasmopara ctibensis 



(B. and C.) Clint., of musk melons and cucumbers. Conn. (State) 

 Agr. Expt. Sta. Ann. Rpt. (1904) 28:329-362, illus. 



11. De Jaczewski, M. A. 1900. Note sur le Peronospora ciibensis B. and C. 



Revue Mycologiane 22:45-47, illus. 



12. Erwin, A. T. 1921. Control of downy mildew of lettuce. Proc. Amer. 



Soc. Hort. Sci. 1920:161-168. 



13. Farlow, W. G. 1889. Notes on fungi. Bot. Gaz. 14:187-190. 



14. Georgia Agricultural Experiment Station. 1930. Downy mildew of cucur- 



bits. Ga. Agr. Expt. Sta. Ann. Rpt. (1929) 42:20. 



15. Guba, E. F. 1928. Control of powdery mildew in greenhouses. Phytopath. 



18:847-860, illus. 



16. Halsted, Byron D. 1889. Peronospora upon cucumbers. Bot. Gaz. 14: 



152-153. 

 17 1889. Some notes upon economic Peronosporeae for 



1889 in New Jersey. Jour. Mycol. 5:201-203. 

 18 1892. Notes upon Peronosporeae for 1891. N.J. 



Agr. Expt. Sta. Ann. Rpt. (1891) 247-249. 



