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GEHEEAL eeeders 
GEASSEOPPERS ( Acri didae ) 
Arizona. 3. M, Ga6.dis an.d assistants (Augiast 31~^eptember 6): Second-genera- 
tion Melanoplus mexicanus Sauss, and marginsd. populations of M, diff er- 
entialis Thos, still presenting problems of control in several sections 
of the State. The former species causing considerable damage to alfalfa 
in the Stuart district of Cochise Comity, the latter to truck crops in 
the Salt River Valley of Maricopa County, 
Texas, ^ (September 7“T3)* second-generation M, mexicanus in the northern 
and central parts of the Texas Paihandle is about 15 percent adult; how- 
ever, in the more southern counties it v/as more advanced, about 35 
cent of the hoppers having reached the adult stage. Plights in a 
southerly direction were reported on September 9 over Childress, Hale, 
and Swisher Counties, Crop damage was confined chief Ijr to jroung wheat, 
ManginaJ destruction averaged, 15 yards into fields in the more heavily 
infested counties in the northern part of the Panhandle, 
Colorado,'^ (iiug’.ist 31 ~Soptember 6): In the dry-land areas of eastern Colo- 
rado the heaviest populations of second-generation M, mexicanus wore 
found in the eastern part of Ba,ca County, v/here they averaged J)0 per 
square yard in weedy environments and 50 in margins. Twenty percent 
were adult. Small-grain populations in Sedgi/ick, Phillips, Yuma, Kit 
Carson, Cheyenne, Kiowa, Lincoln, and Washington Coiuities averaged 15 
per square yard in fields and 30 in margins. In the irrigated areas 
of ProiA/ors, Bent, Otero, Crowley, and eastern Pueblo Counties popula- 
tions a.veraged 50 por sojaare yard in alfaAfa and 75 in margins, while 
in small-grain stubble they averaged 20 in fields and 30 in margins, 
(September l4-20'): Development of second-generation M, mexicanus con- 
tinued rapidly during the veek in eastern Colorado, approximately JO 
percent reaching the adult stage and 20 percent the fifth-instar nymphal 
stage. Grasshopper activity was not grea.t enough to result in appreci- 
able population shifts. Local movement into fall whea.t from adjanent 
stubble and woods wa,s general, hovrever, resulting in light marginal 
■ damage to wheat in fields -unprotected by baiting. In the irrigated 
areas the hoppers had completolj^ defoliated some alfalfa fields. 
Oklahoma.,^ (September 7~13)* Approximately I 5 percent of the second goner- 
Tition of M, mexica nus in the Panhandle area ha,d reached the adult stage. 
Seventy perccne .voro fourth- and fifth- in star nymphs. Marginal wheat 
v/as damaged in ioxas and Cimarron Counties, especially where whca.t a.d- 
joinod vhc'iy sbn.Vblo fields, (September l4-20): Second-generation 
M, enr-'j w „s approximately 50 percent Cudult and 35 percent fourth- 
and f if .;n-:.nstrr nymphs, 
Kansan,”^ (September l4-20): South of the Arkansas River approximately 90 
porcent of ohc second generation of M, mexicanus was adult, while north 
of the rj.ver about 75 percent had reached the a,dult stage. Prom very 
17 
v/here no name is given 
assistants. 
after the State the report is by B. 
M, 
GaxTdis and 
