EXPERIMENTS WITH INSECTICIDES UPON 

 POTATOES. 



Chas. D. Woods. 



Through the generous cooperation of Mr. John Watson of 

 Houlton the Station has been able to make under exceedingly 

 favorable conditions field experiments upon the potato. Not 

 only did Mr. Watson give the free use of land, but he also fur- 

 nished the labor and machinery. The management of the Ban- 

 gor and Aroostook Railroad, with their characteristic interest in 

 and support of all that has for its aim the improvement and 

 development of Aroostook county, furnished free passenger trans- 

 portation to a large amount. Because of this help the Station 

 was enabled to make a series of experiments which it could not 

 otherwise have undertaken. 



Experiments as follows have been carried to a successful issue : 



i. A soil test experiment of 25 plots. 



2. An experiment of 25 plots on the effect of fertilizers, par- 

 ticularly different potash salts, upon the starch content of the 

 potato. 



3. A spraying experiment with Bordeaux mixture and other 

 fungicides for potato blight. 



4. An experiment with several commercial insecticides in 

 comparison with Paris green as a remedy for the potato beetle. 



The experiments with insecticides are here reported. The 

 others will be prepared for publication as early as practicable. 



For the experiment with insecticides, Mr. Watson kindly 

 placed a ten acre field of fairly uniform slope and soil at our 

 disposal. 



This field was planted with Green Mountain potatoes late in 

 April, the rows running east and west. There were 224 rows 

 about 30 rods long running across the field, and in addition about 

 20 shorter rows at the north and ten at the south ends of the 



