...... -44- 
Twc spray applications of Kalo Spray proved just- as effective as 
three dust applications of powdered derris root, each effecting a 75- 
percent control. Powdered cube root, although it contained the same 
amount of rotenone and was used in the same way, was significantly less 
effective than powdered derris root. 
The Kansas Agricultural Experiment Station ( 228 ) in 1938 reported 
that pyrethrum and rotenone dusts applied three times at 5-day intervals 
during the period of nonrolling of the leaves by the larvae gave good con- 
trol. 
Neiswander ( 290 ) in 1938 reported that three applications of derris 
dust gave 75.7— -percent control in Ohio in 1936 and three applications of 
cube dust gave 47,2 percent control. Each material contained 4 percent 
of rotenone and was diluted with gypsum in the ratio 12,5:87.5. Cryolite 
(either natural or artificial) is recommended as giving the best -control. 
y in 1938 
The North Central States Entomologists ( 509 )/discussed the control 
of certain insects by the use of cube and derris. Parker and Lamerson, 
of Manhattan, Kan., reported on the control of the strawberry leaf roller. 
Nicotine sulfate or pyrethrum extract in combination with summer-oil emul- 
sion, sprayed three times at 5-day intervals during the period of nonroll- 
ing of the leaves by the larvae, gave the best results. This hold true 
for the second and third broods, as well as for the first brood. Pyreth- 
rum and rotenone dusts applied during the same period gave good control. 
Cubor containing 0,75 percent of rotenone, with and without sulfur, was 
also tested by these workers. 
Roark ( 557 ) in 1938 reviewed the comparative action of derris and 
cube of equal rotenone content, on this species. Reference was made to 
the Ohio Agricultural Experiment Station ( 316 ), which &n 1936 obtained 
47.2-percent control with a cube-gypsum dust and 75,7-percent control 
with a derris-gypsum dust (each containing 0.5 percent of rotenone). 
Lamerson and Parker ( 246 ) in 1939 recorded tests of insecticides 
against the American strawberry leaf roller at Manhattan, Kans. Against 
half-grown to mature larvae in rolled leaflets, pyrethrum dust containing 
0.8 percent of pyrethrins' gave the best control — 96,8 percent killed. A 
dust containing 1 percent of rotenone killed 90.8 percent and 'one contain- 
ing 0.75- percent of rotenone killed 85.8 percent. 
Carpocapsa po monella (L. ), the codling moth 
Quaintance ( 338 ) reported in 1928 that, according to Van Leeuwen, . der- 
ris in laboratory and field tests in New Jersey bad shown promise for con- 
trol. In- 1929 (339) he reported that derris had been tested for control 
in Arkansas, Colorado, Illinois, Indiana, Kansas, New Jersey, and Washing- 
ton. In Illinois good results were obtained with commercial derris extract 
combined with white oil, 1.25 percent. An alcoholic extract of derris used 
against second-brood worms appeared to be of little value. 
