-25- 
Bohmel ( 4-0 ) in 1937 reported that effective poisoned baits 
against this species were 0.4- percent of sodium fluoride and 1 percent 
of derris (as an acetone extract or as Katakilla) when mixed with 
sugar. Derris did not produce any scorching, but ecdium fluoride did. 
The bait sprays contained either 0.4- percent of sodium fluoride with 
sugar or molasses, or 1 percent of an acetone extract of Derris el - 
liptica with sugar. In some tests a dye was added to the spray and was 
traced on dissection, which confirmed direct observation of feeding. 
In the laboratory, all adults placed on sprayed leaves before and after 
the spray had dried were dead in 2 to 3 days. These results were con- 
firmed by tests in field cages, and in a test on plum trees in the 
open the number of moths was greatly reduced within 2 to 5 days, in 
spite of rain. With molasses the toxic action was a little slower 
than with sugar, and derris was the more effective poison. 
Hyponomeuta padella (L.), the ermine moth 
See also Jancke ( 218 ) under Hyponomeutg malinella , on page 24, 
The larvae were used as test insects by Fryer et al. ( 14-9 ) in 1923 
in studying the insecticidal properties of derris. 
k product containing 12 percent of powdered Lonchocarpus nicou 
root (6 percent rotenone) and 88 percent of talcum killed Yponomeuta 
padella on cherry, according to a letter from Etablissements Rotenia 
to R. C. Roark in 1938. 
Hyponomeuta sp. 
Van der Laan (24^) in 1936 reported that " Yponomeuta " sp. was 
sensitive to derris. 
Lasiocampidae 
Dendrolimus pini (L. ) 
See also Tra.^ardh ( 416 ) under Panolis griseovariegata , on pa^e 92, 
Schwerdtfeger (266) in 1932 reported effective control of this 
species with the proprietary ponders Derrothan I and Derrothan II and 
the emulsion Derrothan, containing derris. 
Fischer and Nitsche (12£) in 1935 reported tests on these pire 
moth caterpillars with rotenone and various derris preparations. 
Crude rotenone 0.6 gm. in 94- cc. of neutral Turkey-red oil plus 6 
cc. of acetone, diluted with water 6:94-, killed 55 percent ifter 5 
days. 
Trappmann and "itsche (417) in 1935 reported that rotenone sprays 
gave a 4,-percent and rotenone dusts an 8-p.rcent mortility of last 
instar? of this species after 8 days. Dosage was reeulatod to give a 
deposit of 0.18 mg. of rotenone ptr 500 cm. 2. 
Klinger ( 237 , 238 ) in 1936 reported that rotenone dust gave 5 
percent mortality and rotenone sproy 15-percent mortality of t, is sp-e 
cies after 8 days. Derris dust gave 4.0-percent mortality in 6 days. 
