-70- 
was (1) to use a 0.75-percent rotenone dust, applied early and 
thoroughly at the same rate with the tdd of a boom on the duster en- 
closed completely and wiih a 25-foot trailer, and (2) to use a 4-per- 
cent nicotine dust whenever possible.— U. S. Bureau of Entomology 
and Plant Quarantine (626) • 
When SAE 10 lubrioating oil and certain adjuvants were added 
to rotenone dusts, consistent increased control with low concentra- 
tions of rotenone was obtained* In one field test with four repli- 
cated plots, a dust mixture containing 0.1 percent of rotenone, 2 
percent of this oil, and 2 percent of propylene laurate showed a con- 
trol of 90 percent in 24 hours .--Campau and coworkers (101 ) ■ 
Early application of rotenone dusts effectively controlled the 
pea aphid in Wisconsin.— Carroll (103 ) . 
Rotenone dust and spray was considerably less effective than 
nicotine applied as a spray or by a vepofumer in a 20-acre field of 
peas in New York. For a 6-year period the population was reduced 
94 percent by a concentrated spray of free nicotine and 2.5 percent 
of rotenone, 92.7 by free nicotine vaporized, 86.5 by a concentrated 
spray of nicotine sulfate, 79.8 by a 2.5 percent rotenone spray, and 
79.3 by a 1-percent rotenone dust with 2 percent soybean oil and pyro- 
phyl lite.— Glasgow (230 , 231 ). 
One or two applications of a 1-percent rotenone dust or a spray 
containing 4 pounds of derris (4 to 6 peroent of rotenone) in 100 
gallons of water with a spreader, made 2 to 4 weeks before pea har- 
vest, often resulted in increased yield of peas.— Huckett (298 ). 
Good commercial control is possible with dusts containing as 
little as 0.5 percent of rotenone when the temperature is as low as 
60°F., and with a maohine and a properly weighted apron satisfactory 
control can be secured at wind velocities up to 15 miles per hour. 
—Janes and Wilson (318 ) • 
Certain combination dusts containing reduced concentrations of 
rotenone and free nicotine gave consistently good control of the pea 
aphid in the field for 2 years.— Lilly (363 ). 
In California 1,614 acres were dusted with rotenone oompounds 
by using the airplane.— Jiackie (385 , p. 351). 
Rotenone dusting, although occasionally ineffective in New York, 
is considerably cheaper than either nicotine vaporfuming or nicotine 
dusting.— Parrott ( 457 ) • 
