ah Ge fps 
Piet éees. A few days after the first young adults emerge they forage for 
AY is food, consisting of grass and weed seeds. At about this time the female 
_ begins to lay eggs again and the larvae from these eggs are apparently 
fed largely on the pulverized seed." 

Lubricating oil shows promise as substitute for water in grass- 
BY hopper baits.—-Reporting on experiments "to test the value of a cheap 
_idubricating oil as a substitute for water and molasses in the standard 
bran-mash grasshopper bait," J.R. Parker, Bozeman, Mont., says: "Large 
plats were poisoned with the various baits and one feeding period al- 
lowed before the first collections. Four more successive collections, 
consisting of live hoppers swept from the poisoned plats, were made 24 
hours apart. Each collection was placed in a screen cage and was sup- 
plied with green feed. The percentage of hoppers dead at the end of 3 
days was taken as the percentage of kill for the day on which the col- 
lection was made. * * * The oil used in the above experiments was a 
low-grade lubricating oil of 40 viscosity and was used at the rate of 
e gallons to 100 pounds of bran. F. A. Morton, working at Mohall, N. 
Dak., obtained an excellent kill in a large, heavily infested flax field 
using 2 gallons of a lighter oil to 100 pounds of bran, but 1 1/2 gal- 
lons of the same oil to 100 pounds of bran, applied on dry sod breeding 
grounds of Camnula pellucida Scudd., did not give as good kills as the 
water-molasses baits," 

Charlottesville field laboratory discontinued.~-The field labora- 
tory formerly located at Charlottesville, Va., was discontinued, effective 
July 31 last. The scientific personnel and projects have been transfer-— 
red to Arlington, Va., where they are being continued under the direction 
of F; W. Poos. 
COTTON INSECTS 
Pink bollworm control.--C. S. Rude, Tlahualilo, Mex., reports on 
"the progressive rate of the mortality of Pectinophora gossypiella 
Saund. under varying conditions from Dec. 29, 1932, to and including 
May 16, 1933. Seven sets of soil conditions were studied: Bolls buried 
4 inches on December 10 without irrigation; bolls buried 4 inches on 
December 10 and irrigated; bolls left on soil surface without irriga-— 
tion; bolls left on soil surface and irrigated; bolls left on soil sur- 
face to March 4 and then buried 4 inches without irrigation; bolls left 
on soil surface to March 4 and then buried 4 inches and irrigated; and 
bolls left on standing stalks. * * * The bolls used were found to have 
an average larval population of 332 larvae per each 100—boll sample on 
Dec. 10, 1932, the time the test was started. * * * Burial followed by 
irrigation in December was most effective. The data obtained also show 
that neither burial nor irrigation alone is effective in reducing over- 
winter survival, but that a combination of the two is required. A certain 
amount of moisture is, however, essential to high survival. In the 
case of bolls left on the surface and not irrigated, the greater part 
of the dead larvae observed were completely desiccated. As the mortal-— 
