﻿STKAWBERKY EOOTWOEM ON" GEEENHOUSE EOSES 



31 



Table 13. — Experiments tcith arsenical dusts on caged straicderry rootivortn 



beetles 



[Five beetles were used in each experiment] 



Material and strength 



Sulphur 90 parts.. 



Arsenate of lead 10 parts.. 



-Sulphur yO parts.. 



-Arsenate of lead —.10 parts.. 



Sulphur 90 parts.. 



.\rseuate of lead 10 parts.. 



Sulphur 80 parts.. 



-\rsenate of lead 20 parts.. 



Sulphur 80 parts.. 



Arsenate of lead 20 parts.. 



Sulphur 80 parts.. 



Arsenate of lead 20 parts.. 



Sulphur 80 parts.. 



Arsenate of lead 10 parts.. 



Bordeau.x, dry 10 parts.. 



Sulphur 50 parts.. 



.\rsenate of lead 10 parts.. 



Kaolin 40 parts.. 



Sulphur 80 parts. , 



-\rsenate of lead 15 parts.. 



Powdered sugar 5 parts.. 



-■Arsenate of lead, pure 



Sulphur 90 parts.. 



Calcium arsenate 10 parts.. 



Sulphur 90 parts.. 



Calcium arsenate 10 parts.. 



Sulphur 80 parts.. 



Calcium arsenate 20 parts.. 



Sulphur 80 parts . . 



Calcium arsenate 20 parts.. 



Calcium arsenate 2 pounds.. 



Water.. 50 gallons.. 



Sulphur... 50 parts. 



Calcium arsenate ...10 parts. 



Kaolin 40 parts.. 



Sulphur 72 parts. 



Arsenate of lead 18 parts.. 



Cornstarch 10 parts.. 



Sulphur 81 parts. 



jVrsenate of lead 9 parts. 



Cornstarch ...10 parts. 



Hellebore, dry.. 



Sulphur, pure 



Check (untreated leaf; 



Do. 



Do 



Check (no food, 14 beetles)... 



First day 



Second day 



Third day 



Fourth day 



Fifth day 





Feed- 





Feed- 





Feed- 





Feed- 





Feed- 



Dead 



mg ' 

 punc- 

 tures 



Dead 



mg 

 punc- 

 tures 



Dead 



mg 

 punc- 

 tures 



Dead 



ing 

 punc- 

 tures 



Dead 



mg 

 punc- 

 tures 



} ' 

 1 » 



10 

 4 



3 

 



8 

 1 







i 



3 



5 



1 

 





 3 







1 







} » 



9 







9 



















1 







} « 



9 



1 



12 



2 



1 







2 



2 







i = 



1 



































} » 







1 



1 







3 











3 



1 



1° 

 1° 



11 

 



3 

 





 6 















2 



3 











3 



1 



1 ° 



1 







3 



























3 



4 



2 



2 















} 1 

 } « 



3 



3 







1 















1 







6 







5 











4 



3 



} 



2 



1 



1 



2 







1 







1 







} » 



1 











3 



2 











2 



1 



} ' 



• 



3 



3 



3 











1 











1 







■ 2 



1 



1 











2 



1 



• 



3 







3 







s 



















f 



3 







3 







2 















^ 

 

 

 

 

 



24 

 18 

 52 

 

 





 

 

 

 

 



20 

 13 

 36 

 65 

 





 

 

 

 

 



6 



8 

 26 

 50 

 25 







1 





 



1 







7 

 4 



15 

 



19 







0) 



(') 





 

 







0) 

 (') 

 91 

 



* No data. 



