June, '21] 



FORD & LARRIMER : EFFICIENCY OF GRASSHOPPER BAITS 



Table VII Crude Arsenic (Bait applied Sept. 24). 



297 



Rate of application Total No. hoppers No. hoppers dying No. hoppers re- Percentage of kill, 

 (wet weight) swept maining alive 



Totals 



519 



In this case 7^2 lbs. and 10 lb. rates gave almost perfect kills, both 

 being noticeably better than the others, although excellent kills were 

 obtained from all the various rates of sowing. 



From these data it will be seen that the lyi lb. and 10 lb. rates gave 

 the best kill; even the 5 lb. rate gave excellent results. The check 

 showed a 11.8% mortahty during the six days in captivity. 



The following table shows a summary of the three series of experi- 

 ments shown in tables V, VI and VII. 



Table VIII 



Rate of application Total No. hoppers No. hoppers dying No. hoppers re- Percentage of kill, 

 swept maining alive 



Totals 



Consulting the above table we find that very little difference exists 

 in the percentage of kill obtained from applying poison bran mash at 

 different rates per acre. The 5 lb. rate fell somewhat below the rest, 

 apparently being a little too thin. The lyi lb. rate gave slightly the 

 best results although little better than the higher rates. From the 

 results here obtained a general recommendation to apply bran mash 



