- 35 - 
The protr??,ctfd drov^ht Ar.ring Jul;^ end the- c-?,rly r^art c.f 
AUf-^ist WPS not fn.vorablp for hi^h yields — a duplic^tinn nf tho 
conditions that ^brev^llrd in- 19^5 vith si-n^r regult^', The yiel( 
in thr P3aD'~ri-ipntn,l.r.lot« was as follows: 
Mat r rial ' " ^irld p^r acre 
Bushel 
Bordpavjc 5-5-50 ,• -^39.1 
'Nicotine tannatP i/ ' UgU.U 
D?rris (rot-nonp)i/ 'j-^3»7 
Cutor (rotfnone) U U57.3 
Fiaf-ron (rntenone)i/ ^ U56.8 
Kubatcy (rotenone-r.yr^thrujn)!/ U22.7 
CalQiu-n arsenate 1/ U20.2 
1/ 
Combinr-d with "bordeaux inixtur- 5-5-50 
With fl;oa ■'bretlps tho ^ut "standi n.^; insect DPst, and ir. the 
atspnce of pot'^to disease,?, the hiJti^r yield in the nicotine-tannatr- 
and rotpnor.e. ■olot?' is b-liftvrd -to Tdh du"- larpTcly to the orot^cti-^n 
furnishod a£:ainst incipient att-^c'-^s ■^f leafhop->iers and potato aphids, 
and rcflectf-d the stiperior ap'-^or> ranee of the plants in those plots 
throughout the .2:rov;in^ season. 
Morrill and Lacroix ( 2S& ) in 1937 roported test': to control the 
potato flea b'-r-tle '^n shade and field-grovrn tobacco in tho Connecticut 
Valley. The followir..- dusts contain^-.:- roteno e wer-^ tested: 
1, Onp part of cube powder (U lor-rcrnt nf rotenone) "olus 3 ''^arts 
of sterile tobacco dust (finely £:round and certified t*" be a by- 
product in the nanufacture of nicotine sulfate), a.-^r-lied ^t the 
rate of U to 10 pounds per acre, 
2, Two ^arts of cube powder- (U ■oerc'^nt of rotenone) plus 8 
parts of bariurn flucsilicate, a;^plied at the r^te of U to S pounds 
r>or acre. 
3, Dust containing- 1 nrrcent of rotenone, aprilied at th'? r^t^ 
of 12 pound's por acre. 
U, One -^art of cube -owdAr (1 lo'^rcent of rcten-ne) r.lus 1 part 
of bari^i^ fl-'osilicat r, atioli'^d at th^ r'^t?^ of 15 'oo-inds rj-r ocr-^. 
5. ProrNrietnr- dust containing? 0.55 '^"rcent of rotr-n-^ne., a-n-olied 
at the ratp of 12 ■oounds p'^-r acre, 
6. Propriet'-^ry i.ugt containin.'? O.S3 p^^rcent of rotenone, a-m^lied 
at th*^ rate of 8 pounds p^r acre. 
All the above-na-ned treatments, and also cryolite, cnve a distinct 
inproveuipnt over the untreated check. The 'fixture of cube-root powder 
and tobacco dust showed tho hi/.iie«5t ni\nber of dead beetles and the nert 
to tho ipqpt total leaf im'ury. The fixture of bariun fluosilic^te and 
cube-root powder was somewhat -norf effocti^o, if ,1ud>,ed by the mrr.b^r of 
live beetles and the total leaf injury. Thi*? superiority is not believed 
to be sufficient to Justify the increasod cost of the nlrture, r.«» each 
natr-rial vros usod at ne-orl?' t^o pn-ip str^n^th "b when ar>r.llod alone. 
