I46 MAINE AGRICULTURAL EXPERIMENT STATION. I902. 



something less than 10 per cent of the total yield on most plots. 

 Because of depressions on plots 6-9, the soil was not as well 

 drained and the rot was increased to about 15 per cent. 



The potatoes all had a high starch content, with but little dif- 

 ferences. There was no apparent relation between the starch 

 content and the kind of insecticide used. In general the plots 

 having the largest yield had the largest potatoes and the lowest 

 starch content. 



The potatoes from plots which were treated with Paris green 

 at the rate of 8 and 12 pounds per acre and arsenate of lead at 

 the rate of 16 and 24 pounds were tested for arsenic and were 

 found to be entirely free. 



EXPERIMENTS BY MR. ROGERS OE BRUNSWICK. 



Two experiments comparing Paris green, Bug Death and 

 arsenate of lead were made in 1902 by Mr. E. A. Rogers of 

 Brunswick. One of these experiments was conducted at Bruns- 

 wick and the other was made for the Danforth Chemical Com- 

 pany in Caribou. Mr. Rogers furnished the Station the full 

 report of these experiments, but as they have been printed in 

 detail in the Maine Farmer only a summary is here given of the 

 experiments and Mr. Rogers' conclusions. 



TABLE SHOWING PLAN AND YIELD PER 



AT BRUNSWICK. 



ACRE IN EXPERIMENT 



Insecticides Used, Kind. 



o 



9 

 10 



Bug Death 



Arsenate of lead 



Paris green .. 



Bug death 



Arsenate of lead 



Paris green 



Bug Death 



Arsenate of lead 



Paris green 



Average marketable 



Bug Death . 



Arsenate of lead 



Pans green 



442 



381 



384 J 



3894 



355i 



349i 



382| 



344| 



299 



