jf'ulton and Magor. ( 13I ) in l^'^J report-^d that vhen derris ir, sprayed 
on "bean plants its constituents are adsorbed and translated to new growth. 
Two varieties of beans (Pinto and Burpee Stringloss Grr-enpod) , grown in 
pots under greenhouse conditions, vrnre treated, before th.- first trifoliate 
leaves appeared, vrith suspension of derris in water, containing 0.025, 
0.05, and 0.25 percent of rotenone. Some of the plants were treated by 
spraying the entire plant with a compressed-air hand sprayer, some by 
painting only the first pair of true leaves, and som»= by painting only 
thr stems. As soon after treatment as the first trifoliate Icavns had 
attained a fair size or about the ti-ne the second trifoliate lea-"-es were 
opening, the first trifoliate lea'^es were removed from the plants and used 
for test?!. Larvae of the Mexican bean ber-tle confined in open glass cells 
v;erf allowed to feed on these leaves and the leaf areas cons^-^-med were 
measured. There was very low mortality among the larvae feeding on the 
nevr growth from either the treated or the untreated plants. T'ere was, 
howev'-r, a definite reduction in feeding area of nrw grovrth on treated 
plants over that on' untreated plants. This reduction in folding area 
was obs<"'rvrd on the first, second, and third trifoliate leaves. 
Chloroform extracts, from the sp.mr plants as thosv'^ used for the 
feeding- tests, vre're prepared for biological and che^iical tests by evapor- 
ating to dryness and removing the residue with acetone. An aliquot of the 
acetonp solutions was tested against goldfish ( Carascius auratus ) in water 
suspension and 100-percent mortality was observed in ovf-ry case, i^o mortal- 
ity was observed in ev-ry case. ITo mortality was observed in extracts 
prepared from \intre?\ted plants. V/here sufficient leaf material was avail- 
able an alioMot was used for the colorin.etric analysis. 
The Georgia Agricultural Exp^ri-qcnt Station ( 163 ) in I937 reported 
the value of several nonpoi-sonous insecticides in controlling this insect 
vfhfn tested, in c'^gefs. A commrrcial dust containing 0,75 percent of rote- 
none in talc and one of Pyrocide, a tradf product made from pyr--thriiin, 
mixed with nine parts of kaolin, gave l^'O-pcrcent kill of beetles and 
complete protection to the bean plants. Egg massp*^ dusted with the rote- 
nore dust hatched but the larvoe died before leaving the et.gshjRll. A third 
commercial material, Florote, containiiig rotenb .e and other materials, killed 
beetles more slov/ly than the others but protected the plants-. 
Hamilton ( 172 ) in 19!^7 reported that Mexican bean be "ties on beens 
were controlled by a spray of U pounds of derris or cube povrder {'^ percent 
of rotf»no~e) and ^ pounds of rosin-residue emulsion per 100 gallons of 
water. The spray acts as a contact T)oison and as a repellent. The effect- 
ive pr-rio'-'. is g day:.' Eighty percent kill of larv>>-^ and 20 percent of re- 
pellency on beetles was obtained. Repeated sprayi:-^g<? would give good control, 
Howard and t'feson ( 198 ) in 1937 reported that the Mexican bean beetle 
can be effecti^-cly controlled by derris or cube dust (0.5 percent of rote- 
none) applied at th'-^ rate of 20 to 25 pounds per acre; or a sprpy contain- 
ing 0.15 percrnt of rotenone. It has born found by growers in New Jersey 
that the use of hoods behind power or traction dusters allows a considerable 
saving in the amount of dust applied for the control of the Mexican bean 
bretlf , When hoods were used in dusting on thr experimental plots of 
Howard and Mason, one-half the dosege gavr~ as satisfactory results as did 
a full dosi^go without thr hoods. These hoods may be constructed of light 
framework, such as barrel hoops and bamboo poles, and may be covered with 
a cheap grade of muslin and attached behind the dust.-^r. They are, of course, 
n^t practicable for use on the hand machines. 
