
ae A, 
tests the oil baits remained effective for several days and gave larger 
kills on the second, third, and fourth days than did baits containing 
water. Sodium fluosilicate continues to give high and quick kills both 
in plot and field tests." 
Consolidation of Monroe. Toledo, and Sandusky laboratories .-—-Effect— 
ive July 1, 1933, the three laboratories engaged in research on the Eu— 
ropean corn borer, located at Monroe, Mich., Toledo, Ohio, and Sandusky, 
Ohio, were consolidated at a new address, 1920 Parkwood Avenue, Toledo. 
The garage and work-shop quarters were moved to 2021 Adams Street, Toledo, 
and will be occupied jointly with the U. S. Bureau of Agricultural 
Engineering. 
COTTON INSECTS 
Cotton flea hopper populations on main host plants.--T. U. Bar- 
Memes prownsville, Tex., reports that the total population of Psallus 
Serzatus Reut., on main host plants, on the basis of 100 sweeps per 
plant on June 28 and on June 30 were as follows: Horsemint, 1,890; croton, 
aeo00U; Gaurd coccinea, 350; cotton, 135, "the number of hoppers upon 
the mint plant exceeding the hoppers on the cotton plant by 150 to 1; 
the population on croton outnumbering the cotton population by 100 tu 
1; and the populatiom on Gaura coccinea exceeding the population on 
Gonton by about 295 to 1." 
At Port Lavaca, Tex., according to K. P. Ewing, the weekly averages 
per 100 sweeps were: 

Cotton Horsemint, Croton Miscellaneous hosts 
ewer 6....o...: a ——— 9.0 
Mag 15 = 20.......... rp ea ee ee ee 3.7 
Bree. 6 27....2..... 69.7 Cee a ee ee 0 
May 29 - June 3.. 217.3 2,249.5 0 ee 0 
Some. 5 ~ 10.00... 252.8 930.0 172200 0 
i 187.4 962.0 1,657.0 0.3 
Mine 19 = 24........ 248 .0 583.7 BA207 UT 9.3 
mane. 26 = July 1..167.7 433.0 3,623.0 Av 
Mr. Ewing also submits a table showing that daily emergence of 
flea-hopper nymphs ceased on June 8 but that, stimulated by rainfall 
on June 11 to 14, emergence began again on June 17 and continued through 
June 21. Of the various host plants concerned the greatest emergence 
was from Croton, with an average (for the month) per cage, or 100 plants, 
of 418, Averages for other hosts were as follows: Parthenium hyster- 
ophorus, 84; ragweed, 31; milkweed, 21; cotton, 15.3; bitterweed, 10; 
fleabane, 3; Aster exilis, 1.5; broomweed, 1; and cocklebur, as 
Heavy survival of pink bollworms at Presidio, Tex.--F. A. Fenton 
and A. J. Chapman report that "The most striking and significant develop— 
ment in June at the pink bollworm laboratory at Presidio was the con— 
tinuation of unusually heavy emergence of moths from long-cycle, or over- 
