358 Report op the Mycologist of the 



Humphrey,* Lodemanf and some other writers have suggested 

 spraying for cucumber downy mildew, but we believe that the 

 only record experiment is one made by Halstedi who reports that 

 cucumber plants sprayed with 'Bordeaux mixture held their 

 leaves longer than unsprayed plants. The results of that exper- 

 iment M^ere somewhat complicated by the fact that the unsprayed 

 plants suffered severely from attacks of anthracnose§ as well as 

 downy mildew. Hence it seemed desirable to have more exper- 

 imental evidence of the efficiency of Bordeaux mixture as a pre- 

 ventive of cucumber downy mildew. 



Let us now return to our own experiment: The forty-two rows 

 of cucuomber plants were divided into five plats as gihown in the 

 accompanying diagram. 



Plan of Experimental Field. 



Plat I. 10 rows ; sprayed 7 ti 



Plat II. Grows; not sprayed. 



Plat III. 10 rows ; sprayi d 7 times. 



Plat IV. 6 rows ; center 2 rows sprayed four times, tbe otber 

 four not sprayed. 



Plat V. 10 rows; sprayed. 7 limes. 



♦Humphrey, J. E. Tenth Ann. Rept. Mass. Agr. Exp. Sta., 1892, p. 227. 

 ILodeman, E. G. The Spraying of Plants, p. 315. 



tHalsted, B. D. Experiments with Cucumbers, Rept. of the New Jersey Agricultural 

 College Experiment Station for 1895, p. SO;!. 

 ^Colhtolrichum lagcnarium (Pass.) Hals. 



