- 37 
Yi.--'l,-'',c \,tc-:r. ap fnllc'?: 
__ '"^it h 5-5-50 B-rc.eaur .Vith 5-'^-50 3orde?v^.T 
Yinld 
Cror- 
Yipld 
•O'-r r>crp 
Cro' 
r, 
:;-!?.t-rial 
Gr^:.e 1 
Gr-.:> 2 
Gr^-^.e 1 
Gr^-'.r 2 
5uphel«? 
^ 
% 
Bush'-lci 
^^ 
^ 
Check (bordopiu- onl:0 
261.7 
75 
11.5- 
257.5 
67 
1^.5 
Calcium. ?rRp;iate 
396.6 
S3 
8.6 
270.8 
77.5 
10.5 
Derris (rote-nor.p ) 
321.7 
82.3 
9.1 . 
302.5 
82.6 
8.0 
Culor (r^t^ncne) 
267.5 
71.6 
13.1 
25^. u 
71.7 
15.7 
Hi CO tin? tannete 
26U.I 
8U.5 
6.6 
293.^ 
82.7 
7.3 
DX (p-'re thrum) 
2^5.9 
79.3 
9.S 
270. s 
77.8 
11.0 
All the nip.te-rialp •vr-'-e hicher yi<'lc.9 vhen comhined vith 5-5-50 
■bor'.o?u7 Grcrr^t r.icoti:-e tannntp and DX, The .yi^ld in the plot" of the?? 
laft two mstrriplp rfflect'*d the iT':ro-"-'-d control of flea tPt^tlRs vhich 
thjC"' offrct'^'d v'hr-n co^hijied with 5-3-50 hordeaiisr. Sr^ra'' injury was vnry 
pprrieon th? plots spra^'c^d vdth 5-3-50 'borde.'^ux. Thi? undouhtf^dl^' er-clains 
thF re'.n.ced -ipld. 
ThR MassachusRttg A ricultur^^l Sy^^ri-^.-nt Station (279) in lo^S 
reported that cuop and dfirrip- pov^ders (e-"ch containing h percent of rotf^n- 
one) rind a •conmo'rcial product containing 2 p^rcont -^f rotenono, us^d vrith 
pither 5-5-50 or 5-3-50 ■bordeaux, arrive "better control of flea hrptlr-s than 
did hordPfiur alone. 
Merrill and Lacroix ( 3S9 ) in 193rs reported tcst--' of insecticidos 
made during 1^37 at the vrindsor., Conn., tohacco sulDstrticn. The following 
roten-^ne preparrti^ns were tried -pu;ain<st thr- potato flea "beetle; (l) Cu"be 
dust containing. 1 percent of roten-^ne plus st'^riliz'^d tobacco dust as the 
diluent; (2) cuhe dust containing 1 percent ^f rrtenone plus p diluent c^n- 
sistinc^ of 75 p^^'cent of steriliz^^d tc-epcco dust and 25 percent of neutral 
tc"b''5cco-colored clay; and (3) dust consisting: of "bariu'T fluo silicate, 8 part; 
and cu"'oe root '-lov/dor cntainin^^ elout 5 percent of rotenone, 2 parts. The 
dust fixtures were apr-lied in two shade t^nts, F^nd. each was-anplied on two 
l/S-acrr plots. An coual nun"bpr of l/S-acre plots w^re left untreat"d in 
the shade tents frr d^^ta on the ^nffstptinn •:^rrv^,ilii.t^ vrh<^n no treat'icnts 
Vff^ro apr)lied. Seven ar'pli.c-''ti''.ns ^f <^ach insecticidf. w' re made "b^twern June 
U and J'\ly 16 at intervals of 7 d?:»ys. The ratrq of rpplic^Tir.n wer^^ 6, c, 
and 10 pomids por acr*, d'^pending on the si^e -.f the.plents. T'".' dosage if 
10 T5oundp ppr pcre wrs used fo" the lapt tv/o applicpti'-n" in July, when the 
to or ceo was nearing^' ipturit^,'. G-ood plant pr'^t'=ction was o"btained from the 
appliceti'n of each of the insecticides listed aljove. The a""'era';T of s?in"Dlo 
counts of insects and dama^'-'d leases sh-^wed thpt nor.p' of thr dusts was siic- 
nificantly "better thp.n the others^ "b-^t ther^. was a highly significant differ- 
ence "betwern fill the treeted plots and the untre^trd checks. Plots t^ept-^-d 
with the dusts shov;ed p.n a^erai-.-e ^f U,li-peroent da^a^-ce, vrh^reas untreated 
check plots sh^vred 2'-,7-"ercent d-'»na..'e. 
Agicide DC-^ (roteno.-.e 0.6 -Dercerit) at the r^^te of U -nounds r»er 100 
gallons of water (O.OO3 -percent of roten'^ne in siorpy) killed from 50 to 100 
percent within ©6 h^urs. — A.^icide Lndor^torJes (6) in 1<^39. 
