- 13 
Treatment 
Net mortality on — 
Derris, 4,3 percent rotenone alone- - - - - - 
with 1 percent wetting agent B- - ■- - 
" with 1 percent wetting agent C- - - - 
" with .1 percent wetting agent A- - - - 
Derris-sulfur mixture 1:3 alone ------- 
with 1 percent wetting agent B- 
" " with 1 rercent wetting agent C- 
" " with 1 percent wettinz aeent A- 
Sulfur alone 
t! 
with 1 percent, wetting agent 3 - - - - 
with 1 percent wetting agent C - - - - 
with- 1 percent wetting agent A - - - - 
Check 
Cotton 
Percent 
55 
39 
55 
36 
20 
34 
41 
28 
20 
19 
14 
13 
27 
ca adensis 
49 
. 42 
40 
30 
46 
43 
28 
36 
13 
14 
20 
13 
47 
The addition of wetting agents to these insecticides and mixtures 
does not appear materially to affect the net mortality. These results 
are based on nine replications. 
L ygus simonyi Peut., a coffee bug 
See LePelley (57) under Ante stia orbital is (Westw.), page 16. 
Lygus sp. 
Cube dust gave 70-porcent control, derris dust (4 percent rotenone) 
80-percent control, and pyrethrum dust 100-percent control in tests made 
on caged cotton plants in the field and in lantern -lobes in the insectary. 1 
Cassidy and Barber (10) in 1935. 
Mertila malayensis Dist. 
Leefmans (56) in 1931 reported that a spray of derris and soap 
gave good results against the capsid Mertila malayensis Dist., attacking 
orchids in the Netherlands Indies. 
PI c s i o c o r i s rugic cllis (Fall.), a: Le capsid bug 
K earns, Larsh, and Pearce (52) in 1933 reported that derris spray 
gives a good measure of control of capsids (probably P. rugicollis ) on 
apple trees in England. 
