-133- 
Material 
Instar 
Dosage 
per cm.' 
Mortality in' 
48 hours 
Micrograms 
Derris (rotenone 5.4 percent; total 
extractives 15,5 percent) as a dust « 
Derris (rotenone 4.5 percent; total - 
extractives 19 percent) as a dust' 
Derris-talc dust (rotenone 1 percent) 
Derris-talc dust (rotenone 0.5 
percent) 
Oube (rotenone 4.4 percent; total 
extractives 20,7 percent) as a dust 
First/, .- 110 
Fourth '-."• 110 
First 
120 
First- , 
. 120 
Fourth 
170 
First 
170 
Fourth 
185 
First ■ 
'-, 185 
Fourth 
125 
First 
125 
Percent 
100 
100 
100 
100 (72 j 
83 
100 
23' 
100 
100 
100 
M. 1. d. of derris and cv.be powders in 48 hours 
Instar 
Fifth Fourth Third Second First 
110(5) — ' — 185(0.5)- 
'The same' Division ( 445 ) in August 1938 issued its third report of test} 
on the insecticidal value of various compounds. Derris (rotenone 5.4 per- 
cent, total extractives 15.5 percent.) at 230 micrograms per cm. ^ gave 100- 
•per cent mortality o ; f fourth; instars in 48 hours. 
Hymeiiia fascialis (Cram.), the Hawaiian beet webworm 
The .Bermuda Department of Agriculture (33) in 1934 reported that der- 
ris spray. (Katakilla) adequately controlled a"~mild attack of the beet fire- 
worm in the field. • ? ,'. . 
Fenton .( 129 ) in 1936 quoted the following from a letter dated December 
10, 1935, from Roney, of the Texas Truck Crop Experiment Station, Dickinson, 
Tex.: 
"Our experiments seem to bear out tho fact that early application* 
of the three-way dust ( 10 percent cube, 15 percent 'A' dust, 75 percent 
sulfur) are very beneficial in controlling the insect. Due to the faol 
that it has such a web, also because of the number of larvae on each 
plant, we find it vory difficult to control," 
Haudo in advertising literature published by John Powell- and Co.,' New 
York, i.'. Y. , in 3 ' i ■ 'erred to the successful control of this species in 
Tc:>:as with a dust containing 10 parts of- cube, 15 parts of Stimtox "A", an< 
75 parts of sulfur. 
