98 Report of the Botanist of the 



Black rot, although somewhat more abundant than in 1899, 

 was not sufficiently destructive to affect the yield. Consequently, 

 the experiment was again a failure so far as throwing light on 

 the value of the treatment is concerned. This season the plants 

 were considerably injured by drought. 



In ipoi. — Tliis year the location of the experiment field was 

 changed. An acre was laid off in the center of a field of Danish 

 Ball Head cabbage a few rods from the former field and on soil 

 of the same character but a little higher and drier. The plants 

 had been set June 21. The field was divided into two equal 

 parts, one part being treated and the other a check. The treat- 

 ments were made weekly commencing August 9 and closing 

 September 21. 



The plants grew vigorously from the start. Although black 

 rot made its appearance at the usual time, the first week in 

 August, it did no damage worth mentioning and for the third 

 time the experiment failed of results because of a lack of the 

 disease. During the whole season there ~ appeared upon the 

 treated half acre only 150 affected leaves and 12 plants affected 

 in the stem. 



Owing to trouble with a produce dealer to whom the crop was 

 sold the Station was prevented from harvesting the cabbages until 

 they had been ruined by freezing and consequently no record of 

 the yield was obtained; but it was estimated to be from 13 to 16 

 Ions. 



EXPERIMENT IN I902. 



Having, for three consecutive seasons, failed to secure a suffi- 

 cient amount of the disease, it was decided to adopt a new method 

 of selecting a field for the experiment. Commencing about July 

 10, cabbage fields in the vicinity of Geneva and Phelps were care- 

 fully watched for the appearance of black rot, the plan being to 

 locate a field in which there promised to be an epidemic of the 

 disease and then arrange to make the experiment there. 



A suitable field was found, July 16, on a farm near Phelps, 

 leased by Mr. Charles D. White. Many leaves were already 

 showing unmistakable signs of infection, and it seemed likely 

 that there would be a serious outbreak of black rot. 



