14 



BULLETIN 1201, U. S. DEPARTMENT OF AGRICULTURE. 



Table 1. — Comparative restdts obtained by testing various powders against six 

 species of insects in the form of dusts and stomach poisons. 





Species and prep- 

 aration. 



Number of insects 

 and how tested. 



Percentage of insects dead within— 1 



Sam- 

 ple 

 No. 



Num- 

 ber of 

 indi- 

 vid- 

 uals. 



Num- 

 ber of 

 sets. 



How 



tested. 



6 



hours. 



1 



day. 



2 

 days. 



3 



days. 



4 



days. 



5 



days. 



6 



days. 



7 



days. 



33a 

 33b 

 109 

 110 



Roaches: 



Amianthium 2 . . 



Do 8 



Hellebore 



120 

 120 

 120 

 25 



25 

 25 



25 

 120 



30 



20 

 33 

 10 

 36 

 10 

 20 



70 

 90 

 40 

 20 

 50 

 20 

 20 

 40 

 90 



10 

 10 

 10 

 10 



100 



( 9 ) 



6 



100 



40 

 20 

 40 

 40 



100 

 100 

 100 



100 



6 

 6 

 6 

 1 

 1 

 1 

 1 

 6 



2 

 2 

 2 



Dusted. 

 ...do... 

 ...do... 

 ...do... 

 ...do... 

 ...do... 

 ...do... 





 1 

 

 8 



24 

 20 

 4 

 





 

 3 

 

 28 

 10 

 



11 



24 

 5 

 

 48 

 15 

 10 

 100 

 





 

 

 

 



100 

 



3 



15 

 50 

 



25 

 25 

 50 

 



5 

 8 

 7 

 44 

 32 

 72 

 76 

 4 



7 

 10 

 27 

 10 

 75 

 100 







24 

 57 

 28 

 15 



88 

 60 

 100 



50 

 13 

 13 

 76 

 84 

 100 

 92 

 5 



13 

 30 

 54 

 20 

 92 



61 

 79 

 36 

 88 

 100 



89 

 90 

 54 



88 



97 

 98 



78 

 88 



99 

 99 

 84 

 88 



100 

 100 

 91 

 88 



56 



Sabadilla 4 



Pyrethrum 



"Cube" 



Control 



Grasshoppers: 



Amianthium. . . 



Do 



Do* 



Hellebore 



Sabadilla 



Pyrethrum 



Control 



Silkworms: 



Sabadilla 5 



Do" 



Hellebore 



Do 





103 











501 



96 



7 



23 

 50 

 100 

 30 

 97 



96 

 9 



57 

 80 



96 



12 



90 



85 



96 



21 



100 



100 



96 

 35 



33a 



33b 

 35f 



Fed.... 

 ...do... 



Dusted. 





109 

 56 



1 j Fed.... 

 3 Dusted. 



50 

 100 



90 



100 





103 



1 

 2 



7 

 9 

 4 

 2 

 5 



...do... 













57 

 63 



48 

 40 

 96 



100 







76 

 97 

 65 

 85 

 100 







87 

 99 

 75 

 85 



30 



93 

 100 



86 

 95 



55 

 97 





121 

 113 



Dusted. 

 ...do.... 

 ...do.... 

 Fed.... 



100 



109 

 109 



93 

 100 



100 



103 



Pyrethrum 



ATnia.nt.hinm 



D-o 





33a 



2 Fed ___- t 











33b 



2 

 4 

 9 



1 

 1 

 1 

 1 

 5 



1 

 5 



2 

 1 

 2 

 2 



1 

 1 

 1 

 1 



...do.... 

 Dusted . 













110 



Derris 























20 

 10 

 40 

 20 

 12 

 100 







60 

 50 

 60 

 30 

 52 







80 

 70 

 70 

 40 

 60 







100 

 100 

 100 

 90 

 96 















33a 



Flies: 



Amianthium. . . 

 Do 



Dusted. 

 ...do.... 



Fed.... 

 ...do... 

 ...do... 



Dusted 

 ...do... 





33b 









33a 



Do 









33b 



Do 



Derris 8 



100 

 100 







11 







110 







103 



Pyrethrum 



Control 

















5 



68 



50 



100 







100 



100 



100 







28 



68 

 100 



28 



33 









109 



Honeybees: 



Hellebore 



Amianthium... 



Sabadilla 



Control 



Potato-beetle larvae: 



Dusted. 

 ...do... 

 ...do.... 









35 f 













56 





























110 



Dusted. 

 ...do... 

 ...do... 













501 



"Cube" 















103 













































i Where a test did not continue for 7 days, col- 

 umns are left blank. 

 J No. 200 powder from bulbs. 

 8 No. 200 powder from leaves. 

 4 No. 100 powder, oil extracted. 



4 No. 40 powder, oil extracted. 

 8 No. 40 powder, oil not extracted. 

 ' No. 60 powder from vines. 

 8 From derris paper {61). 

 * Many. 



Table 2. — Comparative results obtained by dusting aphids icith various powders. 





Species and preparation. 



Esti- 

 mated 

 number 

 of indi- 

 viduals. 



Num- 

 ber of 

 sets. 



Percentage of aphids dead within — * 



Sample 

 No. 



6 hours. 



1 day. 



2 days. 



3 days. 



4 days. 



56 



Aphis sp. B: 



Sabadilla a 



100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 







 

 



5 



5 

 10 



10 

 10 

 25 

 15 

 5 



25 

 75 

 10 



40 

 40 

 50 

 25 

 50 

 50 

 80 

 40 





113 



Do 3 





23k 







33a 







33b 



Do* 









35e 



Do« 









35f 



Dos 









502 











103 





95 

 25 

 15 



100 





110 





100 

 100 







501 



"Cube" 















1 Where a test did not continue for 4 days col- 

 umns are left blank. 

 s Oil extracted. 



3 Oil not extracted. 



* No. 200 powder of leaves. 



6 No. 200 powder of bulbs. 



