i 
- 116 - 
Fleming (I3U) in 1937 rpportnd te?ts with c'.erris as a repellent 
for tko Japr.nepr 'beetle. Fine powdor (200-nesh) i? morp effoctivn than 
coarcir. Materials ar.o.cd to inhilDit th" cloco-"iposition of dnrris "by sun- 
li|£.'ht failed to do so and in somo case=5 r-ducod thf initial rrpolloncy. 
Certain rosin oils cpv. "bn guhstituted for rosin rosiiup o.s a„ stickor for- 
dorris. 
Ploning and Baker (138) in IQ"^! r^ ported on largp-scal--^ fi-pld t"^tq, 
"indp during th-' 193^ season, of naterials us-^d for th- protection of early 
riiDoning peaches and applps fron' injury "by the adult Japanese beetle. 
Various coTihin-'^tions of derris were tested to a.scertain vrhether p.ny more' 
satisfactory conhinations than th^t of derris plus rosin-regidue emulsion, 
novr recommended, could hr dereloped. . It vas found th^^t the derris-rosin 
residue comhin^tion was eou^.lly as good, if not superior to, any oth^~r derris 
co.mhih^tion for protection of early riprnir.g peaches. 
Guy and Schmitt ( 170 ) in 1937 report rd on rep'^llenta for the Japanese 
"beetle. In 1^35 derris, thiura.m sulfides, phmothiazine, and lime vrere tested 
as repellents for the Japanese "beetle at "Torklyn, Del, on a„pple and peach tree 
Three sprays a.t 300-po^^'-"^s' prec^ure with a. single-nozzle gun were 9.pplied on 
■ July 2, July 16, and i^ugust 30. Good coverage vras o"btained with every material 
at thr rate of 3.5 gallons p^r tree, l^one of them caused foliage injury. The 
first application was ma.de oefore th^^ Japanese "beetle ap"oearcd in la.rg^ nu'n'bers. 
VThen feeding "beca.i3^q noticeable the additional coverage w^.s provided. The 
"best protection /afforded by tetr^methyl thiuram disulfide plup; 1 pint of a 
UO-perccnt rosin-residue emulsion. Good resu.lts were given by certain oth>-r 
coibinations which, . although of almost equal efficiency, may be rated in th<^ 
following order: (l) Derris plus 3 pounds of rosin sticker ITo. 1 (50-percent 
emulsion); (2) tetramethyl thiuram monosulfidc plus 1 pint of rosin-residue 
(Uo-percent) em.ulsion; (3) derris plus 3 pounds of rosin-residua (50-pprcent) 
emulsion (Goodhue-Flening formula); (h) phenothiazine plus 1 pint of rosin- 
residue (UO-percent) em.ulsion; (5) derris plus 3 pounds of rosin-residue ■ 
sticker lio. 2 (50-percent emulsion). 
All the mixtures of hydrated lime were inferior to the«5e materials. 
The addition of 3 pounds of aluminum sulfate to hy^irated lime gave greater 
foliage protection than the addition of either ^ pounds of rosin-residue 
f^m-ulsion or I.5 pints of fish oil. Although the hydrated lime-fish-oil 
spray produced an unremova.ble residue on peaches, it was the least effective 
combination tested. All the hydrated-lime sprays were responsible for residues 
which rendered the early peaches unfit for the ma,rket. The synthetic com- 
pounds and derris combinations, on the contrary, had the advantage of leaving 
no conspicuous residues; in fact, there w^s no indication at harvest time of 
the spray? thr^.t ha.d been applied. The result-^^ indicate that eithf^r t*-^tra- 
methyl thiuram disulfide or derris 'plus ^ rosln-type stic^^er offers consider- 
able promise a<5 ^ J-^panepe b'-'^etle repellent, 
H-^milton ( 172 ) in 1Q37 reportpd that Jap^^nese bretlopc on various tre s, 
shrubs, a.nd flovrer<^ were fairly well -controlled by a spriy of U pounds of 
defris or cube povrder (U percent of rotenone) and U pounds of rosin-residue 
emulsion per 100 g-'^llons of wator. The spray acts as a repellent. The effec- 
tive prrio.''. is 6 to 7 '"l-'i-rp* ^atisfa.ctory repellency can be obtained by spray- 
ing 6 or 7 <^'-^y^ a.part. 
