-45- 
The general use of pyrethrum-sulfur or rotenone- sulfur combina- 
tions against flea beetles and aphicis on potatoes may be limited by 
their failure to prevent late blight, and by their higher costs. — 
Daines and coworkers (134) • 
The control of flea beetles on tomatoes by derris increased the 
control rf the early blight fungus by reducing the dissemination of 
the spores and the number of feeding punctures. Effective control 
of the blight where beetles are present early should be achieved by 
applications of copper and derris while the beetles are present, 
followed by copper alone after they have disappear od.--Heuberger ( 284 ) • 
In Connecticut there was no significant difference in effective- 
ness between the three treatments tried— pyrethrum dust alone, pyre- 
thrum followed by cube, and a 1-percent rotenone dust.— Morrill and 
Lacroix (429). 
In New York the addition of pyrethrum and rot enone-be* ring 
powders to bordeaux mixture increased both the control of E. cucuroeris 
and the yields. Cube dust (0.75 percent of rotenone) was effective. 
—Rawlins and Staples (492); Rawlins and coworkers (493) . 
Calcium arsenate dust was the most effective of the re .terials 
tested against the potato flea beetle in field tests ir. the Facific 
Northwest. Dusts containing zinc rsenite and certain fluorine and 
rotenone compounds gave fairly good control after eight applications. 
— U. S. Bureau of Entomology and Plant Quarantine (624 , p. 35). 
In Washington control of larvae on potato tubers was given by 
four to six applications of calcium ar&enate or cryolite dust. A 
mixed dust of rotenone and cryolite was more rapid in action, but the 
cost was high*— Webster and C i workers ( 6 6 4 ) . 
One part of derris suitably diluted with pyrophyllite was as ef- 
fective as 2»5 to 5 parts of derris diluted with clay.— Turner (602 ) • 
In experiments in which counts were taken 3 days after setting 
out tomato plants, both derris dust and derris spray gave satisfactory 
results against the potatoe flea beetle.— Wat kins and Logan (656) • 
Epitrix parvula (F.), the tobacco flea beetle 
Note: Two species Epitrix hertipennis (Meesh) and E. fasciata 
Blatchler have been confused in our literature under the name E. par- 
vula. 
