- 62 - 
Whit'^ ( i^l3 ) in 1936 issued roconmon.iati-ns for th? control of 
insects attacking cortain vpgc- titles?, siTiall fruit?, and to"bacco, Derris 
dust?? indicatFd that they may aid in the control 'f flea tf^ctles infesting 
ca'b'bage and related crops, 
Howard and Mason ( igg ) in 1937 wrote tl-i-at in the hcfbed and cold- 
frames derris or cube will ve found useful in controlling attac>:s of flea 
"beetles on young tomato plants and young eggplants. 
Derris dusts have giv«n satisfactory results on flea ■beetles,— ITew 
Jersey Agricultural Experiment Station ( 297 ) in 1937. 
Hampp and Jehl (176) in 193^ reported experiments on^i the control of 
hop flea "beetles in .1937 ?-t the hop experiment station at Hull, Germany, 
!l?he overwintered adults appeared early in May, and the ne\^ adults, in smalle 
nu-m'bcrs, from mid-July on. The tests were made with unstated quantities of 
derris, derris mixed with pyrethrum, and nicotine. As in all previous tcstp 
■derris dusts proved a"bsolutely reliable if applied in sufficient ouantity 
and, were much superior to pyrethrum, nicotine, or arsenicals,' and eepKcially 
superior to sprays, 
Rotcnone sprays or dusts were recommended "by Parks and Pierstorff of 
the Ohio Extension Service (^12) in 1938 for the control of flea beetles 
on beet, eggplant, pepper, radish, sweet corn, tomato, anvd' turnip. • 
Warwick ( UlO ) in 193^ reported that the most' uniformly reliable 
'method for controlling flea beetle in England is the broadcasting of a good 
quality of derris dust at the rate of about l/2 cwt. (56 pounds) per acre. 
The Idah? Agricultural Experiment Station ( 2l6 ) in I939 reported 
rotenone diigts t^ be effective against flea beetles. • 
Chryscmelidae (unidentified sp.), a rod melon beetle 
An anonym^'Us (k) writer in the Palestine Gazette in I939 stated 
that the red melon beetle is extremely sensitive to derris dusts, which 
can be regarded as the spe.cific poison for chrysomelid beetles, and that 
it. can be easily controlled by two or throe applicati-^ns ■"^f derris dust 
containing 0,75 percent of rotenone, from April to June, inclusive. Against 
the larvae boring in the root collar of the .cucurbits hardly a -measure can 
be advised' because 'they hide underground and their presence becomes evident 
only after the dajnagc is irreparable. Therefore, tho necessity '^f a auick 
and full control of the adults is stressed, A 50-50 mixture -f pure barii?.m 
^r sodium fluoailicfite and derris dust is recommended, provided the whole 
mixture c^^ntains 0.75 percent ^f roten^'-^ne, ■ 
Cicindelidae 
Cicindel? campestris L. , a tiger bertle " , ' 
This insect on rogps was mitigated by a product containing 12 
percent '■■f powdered -L^-ncho carpus nigou r^^ot (of 6 percent rotenone content) 
and 88 percent '.f talcum, accordintr to a lettfr from Etablissempnts H^tmia , 
to E.G. Roark in 1^38, 
