- lis - 
applird at weekly intr-rvals, gavo goo.", control of Japar.esr beetles on "bl^ie- 
■berrip^;, r.'^d rp.splierriec ^ tho foliagcr of grapes, and thr foliage and "bloorn 
of rop~s, crlendula, dahlias, marigold, and. .zinnias. I^'^t applicationi=~Tf 
dnrrie and cube powder containing 5 .percj^nt of rotenone, at the rate of, 
3 pounds por acre^ prevented- the ■'beetics from ffoding.on commercial plant- 
ings of blueberries. 
The United States Department of Agriculture^ Bureau of Entcmolog.y 
and Plant (Quarantine ( 3^8 ) in 193^ report':^d preliminary results vdth ground 
derris, which indicated that the more finely divided materials may prov- 
imore cf+ective than the coarser ones as ropellentg for the adult Jp.panes'" 
beetle. Results with ^'•arious materials .iht ended to inhibit decomposition 
of the active ingredients of de.^ris by sunlight, failed to reveal any sati"?- 
factory materip.l for this purpose. Tae work on th?' decomposition of rotenone, 
a.s measured by chemical mennp!, ir.dicat'd thet so'-'.e constituent of -derris 
other than rotfnone ma^^ be an important factor in its repellent effect (*n 
the Japanese beetle. 
Fleming ^^nd Burgess ( lUl ) in 1939 r-^portod the result-^ of tests against 
Jppane=!(-p beetles with various latrrialc. .These te^ts vrcre con;'.ucted duri:n.g 
the summer of 1938 <=t the •Ja.-^a.n'^se beetl'- laboretory, Moorestov/r, F. J, 
Comparativf> tests were male with derris and cube having the sane rot-nonr 
content (U percent) and -oractically th-" qorri" percentage of total extractives 
(ih and 16 percent, respectively).' Fcith^r mat'^ri^l. appeared to have any 
approcia.ble valU'^ as a stomach noi^on. Derris, however, has a high rating 
as a repellent to thr be^-tle, and the tr-sts indicated th-^-t for repellent 
purpos-'^s- either cub^ or timbo could be substitutrd for derris^ pr::'Vidnd the 
rotenone content of th- materials was about U pi-rcent end th'- total ertrac- . 
tives about I6 percent. - ■ 
Gu^,' and Dietz (l6s) in I939 reported the results of tests with te-tra- 
methyl-thiuram disulfide as a Japanese brr-tle repellent, A mixture of 1 
pcund of this plus 1 pound Qf derris (rotenone U percent) permitted 10 per- 
cent of the foliage of bean lolants to be eaten, as compared vrith I6 p.'rc'-nt 
when 2 pounds of tetranethyl thiuram disulfide vrr-, «; ap"olied. The best re- 
pellent consists of Tetranethyl-thiuram disulfide-' 80 -oercent, clay lU per- 
cent, bentonite 5 pr^rcent, and Lord alcohol 1 percent. This is referred to 
as 7*-'3 ■^pC'. Phonothiazine vras better than derrif:. Derri? plus Grnsselli 
Spreader-Sticker was better than derris plus rosin-residue emulsion, the 
least effc-ctive treatment. Two and one-ialf pounds of 793 ApO was mere 
effective th'-,n U pounds of derris (rotenone 3 percent) plus U pounds of rosin- 
residue emulsion. In field testr^ the mixture of rosin-residue emulsion and 
cube foamed so badly that the spray-tank a^l-tator ha' to be stor)ped. The 
oth-r cube sprays also foamed, but to a, lesser o.egrer. 
Johnson ( 230 ) in 19^0 wrot^- .that derris- (containing-,at least H percent 
of rote'-nonc) with r«sin Tcsidiie must, be used vreekly t.j give protection to 
the' foliage. . Derris and t-etra.methyl-thivira,m disvilfid'" lea>ve very little 
visual spray residue and may be used v^hrre white discoloration is undesirable. 
Two proprietary sprays containing h pprc"nt of rotenone wrre used and compared 
favorably with the derris spray meiition'-d above, 
Pierpont (319) in 1939 reported a study of repellents for the Japanese, 
beetle on American elm trer s in Delaware. He concluded from these results 
that '■ ith- r ground derris (U pounds) or tetramethvlthluram disjilfide (5 pounds' 
