feng he 
Cotton flea hopper.—~K, P. Ewing and R. L. McGarr report that at Port 
Lavaca, Tex., by the end of October the seasonal activity of the cotton 
flea hopper had nearly ended, On the 12 migration flight screens in use 
.- only 1/7 flea hoppers were collected during October as compared with 1,117 
. croton fields, . The. average per 100 sweeps during .t 
, second week, 299.5; third week, 172.33. and fourth week, 92. De _n other 
in September, 1,409 in August, 6,125 in July, 3,826 in June, and. 2,004, 
sin May. Of the 177 caught in October, 131, or. Th percent, were. aught, 
during the first two weeks end during the last. five, days of ithe month. only 
-- flea hoppers were caught. Incidentally, the. activity of other important 
, cotton insects was indicated during October by. the fact that. S2-boll weev- 
ils and 65 cotton plant: bugs (Adelphncoris rapidys Say.) were. taken from 
‘these screens, The gradually decreasing flea hopper population in October 
was also indicated by the counts made from LOO sehr ngs | ‘each week, in 
e first week. wos 545s 
plants in October & [5 hoppers per hundred sweeps were taken on bitter~ 
weed, and they were taken in smaller numbers on.catton and peter exilis, 
while no flea -hoppers were taken en gum plant, elderweed, brociweed, and 
_Erigeron canadensis. The. cotton en which sweepings were made” was young 
. cotton that had sprouted and grown from mature cotton plowed under during 
the summer as part. of the emergency cotton acreage reduction campaign, , 
During September hoppers .had.been taken especially on. Parthenium hy ster 
ophorus, bitterweed, and milkweed and in smaller numbers on bloodweed , 
and ute 
ALL ef the field plat Dace experimoiit’s for the season were .COMe 
pleted during September and October, As a.result of dusting with sulphur 
there was an average increase on 11 plats of 230.4 pounds of seed cotton 
_per acre, or 33.6 percent, the range being from 411 to 88 pounds, The 4 
‘plats dusted with sodium fluosilicate yielded an average increase of 191 
pounds, or 13.9 percent, the range being from 196 to +6 pounds... The 6 
plats dusted with a.mixture: ‘of 75 percent calcium arsenate and 25 percent 
paris green (factory wet-mixed) yielded an average increase of 1 evi 
pounds or 23.8 percent, the range being from 304 to +4 pounds. One of 
the plats dusted with the mixture ef 75 percent calcium arsenate. and 25 
percent paris green was severely injured by the bollworm. Exe luding: this 
plat, the other 5 plats dusted with this mixture yielded an average ine 
crease of 175 pounds, or 32.5 percent, the range being from 304 to 106 
pounds, 
The cage~emergence records this spring showed that each croton plant 
in this section overwintered an average of about 80 cotton flea hopper 
eggs, from which nymphs emerged. Every acre of.,croton contains several 
thousand plants, consequently, the 17,59C acres of croton in the. county 
this fall will undoubtedly hatch millions upon millions of flea hopper 
nymphs next spring, a potential menace to the 1934 cotton crop. 
