-120- 
was somewhat repellent and therefore taken sparingly.— Butler and 
ooworkers (97). 
In cage tests to control insect vectors of azalea flowers, dusts 
of derris, pyrethrum, and nicotine sulfate apparently killed honey- 
bees if dusted directly on them. Caged bees, fed on 5-percent mo- 
lasses sprays containing derris powder to give a rotenone content of 
0,0107 percent, were markedly affected. — Smith and Weiss (550). 
Observations in potato fields located within easy bee flight 
of many commercial bee yards failed to reveal any honeybees frequent- 
ing the potato foliage, and no cases of bee poisoning were reported, 
although these fields were dusted several times with a cryolite-rote- 
none dust.-- Webster ( 661 ) • 
Bom bus impatiens Harr., a bumblebee 
Caged bees, fed on 5-percent molasses sprays containing insecti- 
cides, were killed as follows: 73.5 percent by derris powder to give 
a rotenone content of 0.0107 percent, 68.2 percent by nicotine sulfate 
(2 quarts to 100 gallons), and 81.4 percent by tartar emetic (2 pounds 
to 100 gallons), while 11.5 percent died in the cheoks within 4 days. 
The molasses sprays poisoned with derris powder, nicotine sulfate, 
and tartar emetic markedly affected four other species of bumblebees, 
two species of carpenter bees (Xylocopa) , and a solitary bee (Bnphoropsis ) . 
—Smith and Weiss (550) • 
In tests against the preceding species of bees visiting azalea 
plants, derris powder dusted on them had no apparent effect. A bait 
containing derris powder was poisonous, but when it was sprayed on 
flowers in gardens, was ineffective.— Weiss and Smith (670 ) • 
Argidae 
Arge rosae (L.) 
In Schleswig-Holstein, arsenicals gave good control but dusts of 
derris or pyrethrum were preferable for vegetables or fodder plants. 
In field tests two proprietary dusts, combining derris and pyrethrum, 
gave 99.5 and 95.5 peroent mortality of the larvae and were superior 
to two others containing pyrethrum alone.— Riggert (504 ) . 
In Switzerland derris dust was effective against the larvae on 
turnips.— Roos (514) . 
