

COTTON INSECTS 
Cotton flea hopper control in field plats in 1933.--K. P. Ewing 
and) Rh. L. McGarr; Port Lavaca, Tex., have completed their report on 
last season's field plat control experiments. Sweepings of cotton 
throughout the season to determine the abundance of the species of 
mirids that were present and causing the "hopper" damage showed that 
Psallus seriatus Reut. was, for all practical purposes, the only 
species causing damage in the experimental plats. The cotton plant 
bug (Adelphocorus rapidus Sey) was present in small numbers. but no 
tarnished plant bugs (Lygus pratensis L.) were taken. This is in con- 
trast to conditions in the Delta of Louisiana and Mississippi, where 
the tarnished plant bug often causes considerable damage. The cotton 
in most of the cuts matured before boll weevils became numerous 
enough to,.do any demage, although the infestations of bollworms and 
leafworms interfered to some extent in some plats. Complete records 
of plant heights, form counts, boll counts, and growth conditions 
were made throughout the season. Comparable cuts, of 2 and 3 plats 
each, with a check for each cut were used. The insecticides tested 
in the field were two brands of sulphur on 11 plats, sodium fluosil- 
icate on 4 plats, and a mixture of 75 percent calcium arsenate and 
25 percent paris green on 6 plats. The details of applications and 
yields are given in the following table: 

yn Increase in yield over check 
e260 oF seed cotton per 




:Eiffective:: acre Sulphur Sodium Mixture 
sapplica- :; ; :Sodium: : oo UGS tees 
Cut :tions :Check:Sulphur:fluogil Mixture : foie he seoate +5 eee - 
: Number Habs. siesiih bbsteg! (gibs.tosLus. : Pibse Dice ies bee, 0 
eer ge ott RVICUNT «SThuos ei] LE ORL SOHI0P20. Tei tes és ate 
el nn, Homes Gite. alse ce —= ©92352:0359.5 3 -- Siig Yo=: ut 
Beano: 4 HGH: eoBlL ens h Os ma eset Of65 ou gree IR Oras ae 
Dey 3 5 $4o9Fin -860Kl:s~e= «3 soon ploy Osougiirhes ao7h! Ge —- 
Meee gers  GPBeaLShON. PY 172.2 —- 3238.0:38.5 : 154: e.g Pe cys 
eet |. 2 a Oaaw LIOWe s ¢-Aece Roe Mel Ober (ane ee M2 ~- — 
oes 606 : 974 -: 802: He 26: 96800 960; [eR 1968-9203 -— ar 
ees! yh E1252 : 1384 : 1206: od LOO gO bOS Sse AGeaesae 2 = 
io ae WOO mde So gsliegel ss wS5bun piseva od? ¢ 1002 B3e7 ante. 0 3 e904 
cas, t yh POR Petes ts agen HoolTYem SebTiOnlsg-tess -l90 989.0 7) 20.5 
fee ts 3 PTO teh TO shos-aasi | nehT6 dO. OF 29508! te—-ohevtslaphGGiG h25.9 
ety. d in ;abT eit te2b0 ) 20 i—= 324 S8iOrGlrOes wee fies SHEF200} Sea 
Boi .t © 7664 vows ot! -- 1070 Salt te usbres as-bubksO 0 3598 
Pa. 6 : 964 ; 60 = t= tet ee 3 HO? 0, 4 
Average per acre “~ ie “ued 230.4:33.6 : 101: 13.9°:145.2: 23.8 
