-103- 
them were killed, but when derris powder was added to the pyrethrum- 
oil mixture, the mortality was 77.2 peroent.— Bailey (30) . 
Psilidae 
Psila rosae (F.), the carrot rust fly 
Only 26.1 percent control of the second-generation larvae re- 
sulted from five applications of a derris dust containing 0.75 per- 
cent of rotenone. Oil-cube and derris gave unsatisfactory control. 
—Hanson and Webster (259 ) . 
Experiments in England to control the adult fly on early carrots 
with derris dust (l percent of rotenone) were unsuccessful.— Petherbridge 
and coworkers (465) ♦ 
Syrphidae 
(Merodon ) Lampetia equestris (F.), the narcissus bulb fly 
Extended tests with hydrated lime and ground cube root indicated 
that these materials probably have no practical effectiveness against 
the larvae.— Schopp and coworkers (525) • 
Tephritidae 
Rhagoletis cerasi (L.), the cherry fruitfly of Europe 
In Italy the adult f?ies can be controlled by bait-sprays, or 
by suspending in trees pans containing a bait of 3 percent of mo- 
lasses solution poisoned with 0.4 percent of sodium fluoride or derris 
extract.— Martelli (395). 
Rhagoletis cingulata (Loew), the cherry fruitfly of North America 
Best results were given by three applications of a spray contain- 
ing 2 pounds of derris or cube (5 percent of rotenone), 4 pounds of 
mioronlted wettable sulfur (as a fungicide), and ^- pound of soybean 
flour in 100 gallons of water.— Hamilton (254) . 
Field tests showed that rotenone-bearing materials and phenothia- 
aine were the only inseoticides tested that could be substituted for 
lead arsenate to control cherry fruitflies. The most satisfactory 
mixture consisted of derris or cube (5 peroent of rotenone) 2 pounds, 
micronized wettable sulfur 4 pounds, and soybean flour -£ pound. — 
Parrot t (457). 
