- -lM-3- * 
Schoenobius , incertulus ( Walk . ) 
Otanes ( 320 ) in 1925 wrote that in certain parts of the Visayan Is- 
lands, as in Cebu, it is said that farmers sometimes use -t'..e roots of derris 
for combating the rice "borer "by scattering chips of the roots and stem. 
The juice mixes in solution with the water, and when the caterpillars come 
in contact with the water, as when they transfer from stalk to stalk or 
after hatching, they are poisoned and soon die. Just how effective this 
remedy is has not "been scientifically determined. 
. Sphingidae 
Celerio lineata (?.), the white-lined sphinx 
Finch et al . ( 135 ) in 1939 recommended derris preparations for the 
control of this species on grapes in Arizona. 
Ceratomia catalpae (Bdv.), the catalpa sphinx 
Hamilton ( 180 ) in 1938 reported that the caterpillars on catalpa 
trees were controlled satisfactorily by cube or derris spray (*+ lb. of 
powder containing U percent of rotenone plus h lb. of rosin-residue 
emulsion per 100 gal. of water). The spray acts as a contact poison. 
Within a few hours there was 100-percont kill of all sizes of caterpillars. 
These results were referred to by the New Jersey Agricultural Experiment 
Station ( 29U ) in 1932, and Haude in 1939 recommended this spray, in adver- 
tising literature published by John Powell and Co., lie'-' York, H. Y. 
Herse convolvuli (L.) 
In the laboratory dusts containing 0.0 percent of rotenone killed all 
larvae. — Van der Vecht ( ktk ) in 1936. 
Pholus achemon (Drury) , the achemon sphinx 
Finch et al . ( 133 ) in 1939 recommended derris preparations for control 
on grapes in Arizona. 
Frotoparce quinquemaculata (Haw.), the tomato hornworm (on tobacco) 
Neither pyre thrum nor derris, even at the heaviest doses, gave satis- 
factory control on tobacco, but the larvae, after feeding on derris, 
stopped feeding for a time. — Gil mo re (l6o) in 1933 • 
Stanley and iiarcovitch (391) in 193b reported that in I93U derris 
and pyre thrum were used in Preliminary field tests against this insect on 
tobacco, and some of the applications showed a temporary reduction in number 
of insects. Hornworms were not much affected by either derris or pyrethruo, 
even with heavy applications. Results are shown in the following tablo. 
Cage tests indicated that derris was not toxic to hornworms. Some repel- 
lent action was shown, however, as the worms would not eat dusted 
until they had been exposed for U days. 
