■ - 3^ - 
VTenkl;* records of flea Is^^tlr da'^^ia;^- w?re nfide. in each plot through- 
out the seapon. Results arc- tp.uulatod as follows: 
Matf^rial Punctures p^r leaf clujster 
a"''er?-;:i= for season 
I^^umlDer 
Bordea.ux mirture 5-5-50 1^43 
Kutat ox + hordf-a.-'ox' 5-5-50' . 151 
Cuhcr + 'borceauy $-5-50 110 
Derripol + "bordeaux 5-5-50 101 
Calciuni arsenate + "bordeaux 5-5-50 S2 
Bariun flu.o silicate + hordeaux 5-5^50 135 
Th.-' yield r<^cord in the v^-rioup plot? was as follows: 
Material Yield yr r acre 
Bushels 
Bor.'.eaux niyture 5-5-50 k^h.^G 
KuDatox +. l:ordeaux 5-5-50 505.^8 
Cuhor + hordea.ux 5-5-50 ^16.76 
Calciujn arsenate + tordeaux 5-5-50 UoU.21 
Derrisol + hordeaiix- 5-5-50 392.56 
Eari-XT flu-silic-te + "bordeaux 5-5-50 381. 35 
Anderson and Wal'cer .(l?) ^^ 1937 reported tests made in 1932 
and 193.^ ^'^^ th^ control of the potato flea "beetle. Derris products 
as aprp,ys and dusts killed a high pr-rcentafi:e of the "beetlps ■^^res'^nt 
at the time of applic-'^tion, "but gave only temporary protecti'^n, as -ther 
"beetles soon 'reinfested the treated plats. 
In la'borator;' tf-sts derris-gypsum dust?; containing 1.0, 0.5, and 
0.2 "oercent of rotenone, respecti^ol", killed 100 percent in U5 minutes. 
In field ey-oerinents derris dtists vrere also very effective. — Kelsall and 
Stultz ( 2U2) in 1937, 
The Massachusetts A.ricultural Sxperiient Station ( 277 ) in I937 
aiCain reported on the control of flea heptles on' -notatoes. In the plots 
devoted to field test? of different insecticides '^n the standard variety 
Gr'^en Movmtain, 11 applications of hordeaux mixture were raade from June 10 
to August 2^. Insecticides wer-^ added to 5-5-50 "bordeaux in 5 a'O'olicati'^ns 
fro 1 July 15 to August lU. The treatment?; were duplic-^ted on l/lOO-acre 
plot?. Bordeaux nixturr itself is an effecti""'e repellent for flea "beetles, 
yet, each a,dditional matrrial produced increased control. The ranking 
effectivrness of the spr" ■• mixtures, mea-'urod "by sn.ccepcive c^unt?! of leaf 
punctures, v^as as follovrs: 
1. Bordeaux rlup Calrite (a or.and of calcium ars.-^nate) 
2. Bordeaux plus C^'-'oor (rotenone) 
3. Bord'^aur rlus j^Tia-rvron (rot'^n'^n'^) 
U. Bordeaux rilus Ku"batox (roten-^ne and riyr-thrum) 
5. Bordeaux plris nicotine tannato 
S. Bordeaux' alone 
