- ?1 - 
G-ins>)urs (46) in 1928 reported that a suspension of derris 
(1-400) !:illed 100 percent of the honey "bees after 24 hours, and 
suspension of cute root (1-200) killed 100 percent of the hees after 
48 hours. These suspensions were mixed v;ith honey -anti fed to the bees. 
G-orham (47) in 1928 report od .on the European rose sawfly in 
New Brunswick, Canada. It v;as found that, like other sav;fly larvae, 
these were very susceptible to the toxic action of derris dust and 
that they dropped in a helpless condition within 2 hours after appli- 
cation. No objectionable stains \\:crc left on the foliage or blooms. 
Leynen (58) in 1928 reported that the "Commission Kollandaisc 
du Varron" recommends derris powder for H;^Tpoderma larvae, as recommended 
by Bishopp ct al. (6) in United States Department of Agriculture Bul- 
letin 1369. 
Parman et al. (75) in 1928 reported that derris pov/dcr, 0.5 gram, 
plus kaolin, 4.5 grams, when spread upon 4-ouncc cubes of beef liver in 
a mason Jar repelled 38 percent of the scrcv/-worm flics and 81 percent 
of the Lucilia flies that approached the meat. 
Q^aintance (78), at the 1028 annual meeting of the American 
Association of Economic Entomologists, reported that derris had been 
tested for the control of the codling moth in Arkansas, Colorado, 
Illinois, Indiana, Kansas, Ne^-' Jersey, and Washington. In Illinois good 
results were obtained with commercial derris extract combined with v/hite 
oil, 1-1/4 percent. An alcoholic extract of derris used against second- 
brood worms appeared to be of little value. 
Tc".manul:i (90) in 1928 recommended derris and soap spray for the 
control of Galorucclla rubi Tamanulci o:i the young leaves of strav;bcrry 
plants in r.outhcrn Saldinlin. 
Sch-.;artz and Shook (84) in 192B recommended that, for combating 
fleas on rabbits, the animals be dusted viVa pyrothrum pov;dcr, or povrdcred 
naphthalene, or povrdercd derris root. 
Ripley and Hepburn (80) in 1928 reported on top-dressing maize 
against the stalk borer. Pov/dcrcd derris root v/hcn applied in water at 
1 to 90 is much more effective than ''hen used as a pov/dcr at 1 to 12. 
The killing power of a dry poiirdcr under the conditions of top-dressing 
is far below that of the same powder diluted to the same extent but 
applied as a. suspension in water. This is perhaps explained by the fact 
that v/hcn suddenly wetted by a liquid the borers swallov: some of it 
(as is easily shown by using a colored liquid and dissecting the digestive 
system after dipping) , whereas thoy do not appear to swallov; a dry powder 
very readily. Thus the liquid ca;i act o.s a stomach poison more effectively 
thaia the pov;der. 
"It '-^as hoped that by mixing tv/o insect iciden that v/ere 
k]iown to act differently upon the borer, such as derris and a 
flf-orino compound, or nicotine and an n.rr>enical, the result might 
be a killini^- power greater than that of cither of the tv;o in- 
gredients used separately, but at the same concentratio:. as the 
mixture. Variotxs cx-oeriments on this point v/ere performed, but 
no advantage of mixing was shov/n,,the killing power of the 
mixture always proving to be intermediate botv/een those of the 
tv/o ingredients." 
