
et es 
In tests by Mr. Wisecup azainst the bean leaf roller leaves were 
treated in the laboratory and larvae introduced. The most consistent kill 
was given by synthetic cryolite, either as a spray or a dust diluted with 
flour. Sodiur: fluosilicate dust (30 percent) was very effective avainst 
he small larvae, as were the lead arsenate spray and the rotencne-con- 
taining dust. agoinst the large larvae rote enoue-containing dusts and 
oO percent sodium flucsilicate were much less effective than cryolite 
flour and lead arsenate-line dusts. Rotenone-containing svrays, at l 
part in 200 parts of water, appeared to be rather effectir re pepe ee 
as only a smeil portion of the treated fovd was eaten. However, when un- 
treated fual was added the larvae fed readily and developed normally, 
inuicating tnat the contact with the rotenone-treated feod had not been 
fetal. . 
sweet potato Weevil Control 
Theowsch funds allotted by the Federal Emer uncy Relief Administra- 
tion work is actively. Under tis in climinating seaside and marsh morning-— 
Lories in areas infested with the sweetnpotato weevil in Alabana, Georgia, 
SSissipoi, and mei veza This work is being done in cooperation with 
a a ek eh is arama in charge, reports thet the labor obtained 
21 e 
a 
4 
very satisfactory. 
Beet Leafhopper Control in California 
A similar project is under way in California where an attempt is pe 
mag made under tne direction of W. CG. Cook to reduce the breeding areas 
he beet leafhopper through the burning ‘and destruction cf Russian 
tle at stratezic points in the San Joaquin Valley. This work is be- 
ing done with the Federal. nmergency Relief funds in the various counties 
iu which the important Russian thistle areas occur. 
Mexican Bean Beetle Hibernaticn 
After summarizing the past season's notes, J. R. Douglass,. Estancia, 
New Mex., makes tne following comments on the hibernation of the Mexican 
Tea Waist ° 
CeaAn DeetLes 
"This season's investigations confirm the findings of the preceding 
season in eliminating the upper Sonoren end the Canadian life zones as 
votential hibernation quarters for the Mexican bean beetle in the South- 
west. In the western yellow pine forest zone an average of 15.48 percent 
of the bectles introduced in the various cages overwintered. Successful 
hibernation of the bean beetle in the Estancia Vailey is confined to the 

western yellow wine (Pinus ponderosa) association of the Transition 
Life Zones, espe eared wnere oak trees are associated. The: pine belt is 
used te distinguish the zorie of hibernation as the oaks go up into the 
fir--spruce association. The evidence at hand indicates that. beetles can 
not nibernate above the Coloradan zone even if adequate hibernaticn 
naterial is available, but can do so below the Coloradan zone." 
