- - 80 - 
G. D. Jones -( 2-31 ) in 1938 vrrote that derris or cu'bt' dusts contain- 
ing 0.5 percent of rotenone -ha^e proved most satisfactory under eastern 
conditions for the control of the Mexican "bean beetle. 
The Maine Agricultural Experi^p.ent Station (271) in IS^S reported 
that rotenone dusts, which should "be applied at least 10 days prior to 
the picking of green beans, appear to give good control and are safe to 
use on beans for market or canning. 
.The ITev? Jersey State Agricultureal Experiment Station ( 29g )in I93S 
reported that a spray of derris or cube powder plus rosin-residue emulsion 
in water was effective against the larvae of the Mexican bean beetle. and 
has some contact and repellent action against the adults. This station 
stated that, out of over 500 synthetic organic compounds tested during the 
preceding 3 years, 13 which proved toxic to silkwo'rras were tested on the 
Mexican bean beetle and 1 of thepe proved sur.'ferior to lead arsenate in 
toxicity and equal to or better than derris. 
The New York Agricultural Experi'ient Statio.-; ( 302 ) in I938 reported 
the results of tests against the Mexican bean beetle, ma.'.e with bordeaux 
mixture and rotenone-containing povrders as a combination fungicide-insecti- 
cide sprey for use on fall-grown lima beans. The results indicated that 
a spray consisting of ti.ibo powder in combination with bordeaux mixture 
was as effective as one of timbo povrder alone, 
Now '"^ork County Agents Training School (300) in I938 announced the 
following .results of tepts for the Control of the Mexican bean beetle:, 
"On dry field beans, very good kill with Pyrocide No, 5 dust at 30 pounds 
per acre. Same is true with 0,75 percent -of rotenone. " Rotenone spray of 
3 pounds of 5 percent of rotenone, with 2 to 3 pounds of skim milk per 
100 gallons, is also very good. On lima beans on Long Island the most 
effecti-"-e results for the third "successive season were obtained where 
applications of- bordeaux m.ixture and rotenone-bearing po^^rder had been made, 
whether the materials vrere applied separately or in combination. Similarly 
successful results v/ere obtained v/here Cupro-K vras substituted for bordeaux 
mixture. The fact that there are indications that rotenor.e-bearing pov/der 
can, with certain mild reservations, be combined with bordeaux mixture for 
spraying purposes without losing thereby its effectiveness greatly simpli- 
fies the problem of furnishing a practical formula to the grower that may 
be used for control of most parasites attacking lima bean folia.ge and pods. 
Howard (306) discussed green bean pests in I938 as follows; 
Our primary recommendations for the control of the 
Me^'ican bean beetle are derris and cube dusts and sprays. 
We do not need nuite so stro-ng a derris and cube dust and 
spray for. the control of the Mexican bean beetle as for 
the other truck-crop insects. A 0,015-p'^rcent-rotC'none 
spray or a 0.5-p<?rcent-rotenone dust is strong enough, 
but we do not like to encoura;;;e the selling of a 0.5-pf'r- 
cv-nt dust because in the garden generally we should probably 
use a 0.75'-P'rcent dust. 
