- 20 - 
Howard and Mason (42_) in 19S7 referred to Brannon's tests which 
indicated that derris spray or dust is a promising reredy. 
Walker and Anderson (95) in 1937 reported that derris dust and 
sprays have given promising results. 
Fulton and Howard (28) in 1938 reported that the addition of peanut 
oil or pine oil to a derris-talc dust mixture greatly increased its 
toxicity to the harlequin hug. In fact, a derris-talc dust mixture without 
an oil and containing 0.5 percent of rotenone is very near].;/ innocuous 
against the harlequin bug. The status of a wetting agent in the derris- 
talc-oil dust mixture has not heen determined definitely, but it is 
believed, on the basis of results obtained in preliminary experiments, 
that a wetting agent is unnecessary in this mixture and may be detrimental. 
Gunderson of the Extension Service of the Iowa State College (34) 
in 1938 recommended derris for the control of the harlequin bug. 
Parks and Pierstorff (70) of the Extension Service, Ohio State 
University, in 1338 rccommend"ed" a strong rotenone spray with soap as a 
spreader for the control o n the harlequin bug en cabbage and cauliflower,' 
Fulton and Howard (29) in July 1939 reverted that coconut, castor, 
linseed, and corn oils were"~more toxic to the harlequin bug after sulfona- 
tion; whereas the toxicity of olive, teaseed, and cottonseed oils was not 
appreciably increased by sulfonation, Sulfonation of soybean oil increased 
the toxicity to M, histrionica from 39 to 87 percent. These tests were all 
made with mixtures of the oils and cube powder under laboratory conditions. 
Mi P. Jones (48) ■ in the 4-H Club insect manual issued in 1939 
recommended derris or cube for the control of the harlequin bug. 
Walker and Anderson (96) in 133 c recorded tests with derris powder 
and cube powders as sprays and" with Stantex E against the harlequin bug 
on cabbage. A cube-talc dust containing 2 percent of rotenone gave only 
38-percent control when applied on a sunshiny day at a temperature of 
64° F # and a relative humidity of 63 percent; but a cube dust containing 
0.75 percent of rotenone, applied during a light drizzle of rain, gave 
83-percent control. The authors concluded that thoroughly spraying 
plants infested with harlequin bugs with a mixture containing 8 pounds 
of derris or cube powder (rotenone content 5 or 6 percent) to 100 gallons 
of water, to which a good wetting agent has been added, wil] give good 
control of all harlequin bugs hit by the spray. Further, 1 part of 
Stantex R emulsified in 50 parts of water and thoroughly applied Till 
give good control of this nest, as will the concentrated derris extract 
plus soap sprag previously recommended. On large plants where the bugs 
are well protected it may be necessary to spray two or three times at 
weekly intervals to insure good control. 
Podops lurida (.'hvrm, ) 
inc ir- 
lS 27 reported 
40 impcria" 1 
at 675 gm. 
The Institute of Physical and Chemical research, Japan (44) in 
ported that Ecoton at 450 gm. plus twice its weight of soap in 
rial gal-Ions of water killed onlv 17.5 percent of the adults; 
gm. plus 750 gm. of soap it killed 100 percent of the third 
