oe 
Barium fluosilicate dust effective on second generation of south- 
western corn borer.--E. G. Davis, Tempe, Ariz., reports as follows on the 
control of Diatraea grandiosella Dyar: "Dust applications were made ear— 
lier in the season to control the second-generation larvae. The dusts 
consisted of different ctrengths of barium fluosilicate. One of the 
dusts had a light mineral oil added to make it adhere to the plant more 
readily. Plots dusted with 20, 25, and 30 per cent barium fluosilicate 
and hydrated lime reduced the percentage of infested cornstalks from 
70 per cent to 20 per cent. The plot dusted with 30 per cent barium 
fluosilicate and hydrated lime with oil added reduced the percentage 
of stalk infestation from 70 per cent to 10 per cent. One plot dusted 
with an 80 per cent barium fluosilicate dust gave a 100 per cent con— 
trol, there not being a single stalk infested. The effectiveness of 
this 80 per cent dust was largely due to its physical make-up rather 
than to the greater quantity of poison present." 
Large shipment of Phaeogenes nigridens Wesm. from Italy received.—— 
H, D. Smith, of the European parasite laboratory, Hyéres, Var, France, 
reports that "A total of 26,100 parasitized pupae (of the European corn 
borer) and 7,836 adult parasites were collected near Bergamo, Italy, 
from August 4 to 15 and shipped (about 2,000 per box) in cold storage 
via Genoa to Arlington. Development was not retarded until arrival on 
board ship August 11 and August 16. Total corn borer pupae collected 
amounted to 347,059, representing four days' work by more than1,000 work— 
ers. The infestation was lighter than normal, being from 20 per cent to 
50 per cent in most of the fields. * * * The optimum condition for ship-— 
ping this parasite--a temperature of about 64° F. from time of collec-— 
tion to receipt at Arlington—-was impossible to obtain aboard ship and 
the parasites were allowed to develop normally to adults (the hibernating 
stage) and then kept in cold storage (46° to 50° F.). This was the larg— 
est Phaeogenes shipment ever made in any one year." 
COTTON INSECTS 
Pink bollworm develops more rapidly in squares than in bolls.—- 
S. L. Calhoun and assistants, Presidio, Tex., report as follows on the 
biological studies of the pink bollworm (Pectinophora gossypiella Saund.): 
"Three complete generations of the pink bollworm had completed develop— 
ment in cotton squares at Presidio, Tex., up to August 24, while only 
one and a partial second generation had completed development in cotton 
bolls at that date. The average longevity of first boll brood females 
was 10.55 days and for those of the second square brood it was 8.55 days 
at mean temperatures of 84.88° F. and 86.36° F,, respectively. For males 
of the first boll brood the average longevity was 10.08 days and for 
males of the second square brood it was 8.0 days at mean temperatures of 
84.82° F. and 86.47° F., respectively," 
Bollies more favorable than gin trash for survival of pink boll- 
worm.—-W. L. Owen, jr., Presidio, reports that "A total of 18 long—cycle 
