416 NEW JERSEY AGRICULTURAL COLLEGE 



was begun November 27th, and between that date and April Is I: 

 twenty-six applications were made. During cloudy weather, when the 

 conditions were most favorable to the mildew, the applications were 

 made every two days. 



For a time there was no striking contrast between the sprayed plants 

 and the unsprayed; but after the third week the mildew was mucli 

 more conspicuous upon the unspraj^ed. These made but feeble growth 

 and developed almost no flowers. Before the end of the season two- 

 thirds of the phlox plants were dead. The check verbenas surviverl. 

 but were practically worthless. 



The plants treated with kerosene emulsion, although not wholly free 

 from mildew, were not sufficiently afl:ected to prevent their making a 

 vigorous growth, and in due time blooming freely until the end of the 

 season. Plate X. shows a portion of the spraying experiment witli 

 phlox. The untreated rows are upon the right and treated rows upon 

 the left. 



About midwinter a verbena plant seriously affected by mildew wm^ 

 transplanted to a box and its foliage divided as nearly as possible by 

 a board partition. One of these halves was sprayed every six days 

 with kerosene emulsion, while*the other was untreated. The appear- 

 ance of the plant at the end of the season is shown in Plate XI. 



The soap solution was applied throughout the season at the same 

 intervals as the emulsion, and while its effect upon the mildew was 

 apparent, the plants so treated were plainly inferior to those sprayed 

 with emulsion. 



A limited test was made of the fungicidal value of half and quarter- 

 strength solutions of the greenhouse fungicides employed. 



3 potted plants were sprayed with half-strength kerosene emulsion. 



3 " " " " " quarter " " " 



3 " " " " " half " " soap. 



3 " " " " " quarter " " " 



These plants were sprayed at the same intervals as those in the 

 bench. The half and quarter-strength emulsion seemed to prevent tlie 

 mildew about as well as the full-strength solution, but it is desired to 

 make a more extended trial of the weaker solutions before advising 

 their use. 



Half and quarter-strength soaps checked the mildew but little; the 

 plants so treated being severely infested. 



