May aod 
C. L. Smith and C. S. Rude have been making a comparative study 
of the pink bollworm and the boll weevil in a combined infestation. 
They report: "These studies show that the presence of the boll weevil 
in cotton fields in fairly large numbers does not affect the develop— 
ment of the pink bollworm. Larvae of both species developed together 
in both squares and bolls. It can thus be stated that should the pink 
bollworm ever invade the eastern cotton belt, the boll weevil would not 
check its development-——nor would the pink bollworm check weevil develop— 
ment," 
STORED PRODUCT INSECTS 
Wallace Colman, Silver Spring, Md., reports the following results 
on the use of paradichlorobenzene against clothes moths in closets: "Fu— 
migation tests in clothes closets have shown that in a reasonably tight 
100 cubic foot closet whose walls are made of porous material such as 
wall-board, the evaporation of 325 grams (about 11 ounces) of paradichlo- 
robenzene over a period of 48 hours will produce 100 per cent mortality 
of clothes moth larvae. The fumigation efficiency of such a closet is 
greatly increased by coating the interior with shellac. A shellaced 
closet requires only 50 grams to produce the same effect." 
Newell E. Good, reporting "further experiments on the penetration 
of flour bags by (the confused flour beetle) Tribolium confusum Jacq. 
Duv., (the saw-toothed grain beetle) Silvanus surinamensis (L.), and 
(the Indian-meal moth) Plodia interpunctella Hbn., substantiate a previ- 
ous report that these insects are unable to penetrate fine woven cambric 
bags except occasionally along seams. However they will readily penetrate 
the Osnaberg and jute bags." 

George B. Wagner, Kansas City, Mo., states that on November 21 to 
25 the personnel of his laboratory assisted a milling company in Kansas 
in the fumigation of their warehouse which is typical of the mill ware— 
houses in the Southwest. Mr. Wagner says: "The warehouse contained a 
total of 131,250 feet and 159,528 pounds of flour and mill products were 
stored in this building. * * * Thirty pounds of liquid hydrocyanic 
acid in the form of cardboard discs was distributed uniformly about 
the warehouse, after which the exit door was sealed. Thirty pounds of 
liquid hydrocyanic acid was pumped into the warehouse * * * Expos-— 
ure, $7 hours; dosage per 1,000 cubic feet, 7.31 ounces; wind velocity, 
15 miles per hour from the southwest until Monday, November 21, when 
the wind increased to a 40—mile gale; rainfall, 1.25 inches; temperature 
70° and dropped as low as 55° during the experiment. The per cent kill 
was 90.5. * * * checks placed in interstices of shorts gave 100 per cent 
kill; checks placed in bran—100 per cent kill: checks placed in flour—— 
68.75 per cent kill; checks placed in stacks of 24 pounds of cornmeal— 

