-84- 
E. 8ubcrinlta (Leo.), the western potato flea beetle 
Same as for E. tub erls >— White (573 ) . 
Epltrix tuberls Gentner, the tuber flea beetle 
DDT dust was placed in soil around potato plants at a depth of 
about 2 inches for controlling tuber flea beetles* Harked reductions 
in larval injury to tubers was obtained with both a 3-peroent and a 10- 
percent dust applied at the rate of 200 pounds per acre. Some control 
was indicated by applications of 100 pounds per acre, but no improvement 
was shown by 50-pound applications* In the laboratory a 3-peroent DDT 
dust gave 81 percent mortality of adult beetles as oompared with 41 per- 
cent with cryolite-sulfur dust, which is the dust now being used for 
flea beetle oontrol in western Nebraska.— »Tate et al. (342) • 
A 3-peroent TOT dust is recommended in Oregon for the control of 
this beetle on potatoes. Atomized oil containing 5 percent of DDT is 
also effective. — Gray and Schuh (189 ) • 
Experiments comparing cryolite, calcium arsenate, and DDT dust 
mixtures against the tuber flea beetle and the western potato flea beetle 
were conducted in the Yakima Valley, Wash. The tuber flea beetle, form- 
erly designated as the western form of E. cucumeris (Earr.), was the 
predominant species. Four applicati an s~bf~a~TC— percent DDT dust at the 
rate of 17 pounds compared with a 70-percent cryolite dust mixture applied 
at 10 pounds per acre-application yielded the following results: DDT 
plots 42 percent damaged tubers; cryolite plots 54 percent damaged tubers. 
The total yield of marketable potatoes was about the same for both treat- 
ments.— ^Ifhite (373 ) . 
Epitrix spp. 
Same as for Bruohus pis orun . —Gray (186) • 
A 3-peroent DDT dust was effective against flea beetles an eggplant. 
— Haseman (203 ) . 
Eggplants in late August had a heavy population of flea beetles. 
One treatment of 20-percent DDT spray applied with a knapsack sprayer 
appeared to have no effect on the population, as observations 24 and 48 
hours later revealed the beetles still feeding on the residue-covered 
plants.— Gould (184 ) • 
Fidla viticida Walsh, the grape rootworn 
In preliminary tests with DDT favorable results were obtained in the 
control of this insect. --Baker and Porter (81) . 
