215% 
The square-infestation records showed that sodiun fluosilicate, 
sodium fluoaluminate, and barium fluosilicate were not so effective 
as calcium arsenate when applied at the same rate per acre. Sodium 
fluosilicate, when applied at the raté of 8 to 12 pounds per-acre 
(per application), was more effective in controlling the percentage 
of square infestation than when applied at the rate of 4 to 6 pounds 
per acre (per application). With 7 effective applications at % to 
le ppunds per acre the plats yielded 3.9 percent and at 4 to 6 pounds 
they yielded 20.5 percent. less seed cotton than the untreated check, 
while calcium arsenate gave an increased yield of 36 percent over the 
check, Light to serious burning of the cotton foliage was caused 
by most of the sodium fluosilicate applications. Sodium fluoalumin- 
ate gave a decreased yield of 1,4 percent and barium fluosilicate 
gave an increased yield of 3.9 percent, as compared with 36 percent 
increased yield from the calcium arsenate in the same test. 
The wet and dry 75 percent calcium. arsenate and 25 percent paris 
green, of brands both A and B, were equally or more effective in con 
trolling the weevil than was calcium arsenate and in some tests gave 
increascd yields greater than were given by calcium arsenate alone, 
The comparative yields in the plats treated with the wet anddry mix 
tures indicate that there is little difference in their effectiveness. 
Burning of the cotton foliage was produced by many of the applications 
of both the wet and dry mixtures of Brands A and B. The two mixtures 
of 20 and 25 percent copper arsenate mith 80 and 75 percent calcium 
arsenate gave results about equal to those of the wet and dry mixed 
peris green and calcium arsenate. The hydrated lime and calcium ar-— 
senate mixed 1-1 and 2-1 gave very good weevil control, based on the 
square infestation records, but the increase in yield for the one 
test of each mixture was not so great as for the plat treated with 
calcium arsenate alone. Although there was considerable variation in 
the increased yields of the three cultivator—dusted plats, when aver- 
aged, they gave rather promising results. The nine plats given the 
standard calcium arsenate treatment gave an average increase of 419 
pounds of seed cotton per acre, or 45.4 percent increase over the eight 
untreated check plats. These gains ranged from 187 to 617 pounds of 
seed cotton per acre, or from 28.6 to 72 percent. 
Cotton leaf perforator.--T. C. Barber, Brovnsville, Tex., reports 
that during October and November the cotton leaf perforator (Buccula- 
trix thurberiella Busck) increased slightly in.the fields after being 
almost exterminated in that district because of the defoliation of the 
cotton plants by the September hurricane. As the cotton foliage in- 
creased during December the perforators became more abundant and can 
now be found in nearly all fields. Fortunately the life-history studies 
