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GEITERAL EESDSRS 
GRASSHOPPERS (Acrididae) 
Arizona. B, M, Gaddis and assistants i/ (Angus ■t 3*"9)j Second-generation 
Melanoplus mexicanus Sauss, v;hich developed only in crop land in the 
St-ua.rt district of Cochise County and the Gila River Valley of Graham 
County, range in development from first- to fourth-instar nymphs. Popu- 
lations averaged 20 per squane yard in the Stuant district and slightly 
less in the Gila Hi"'Or Valley area. Second-generation M, mexicanus 
rcanging in development from first- to fif th-insta,r nymphs in evidence 
in scattered fields in Maricopa Comity. M. difforentialis 0?hos, in- 
festations in Maricopa County wcr« spotted and confined to field margins, 
roadsides, and irrigation ditches, 
ITcv; Mexico c~' (July 2J-August 2): M, difforonti aj is is the dominant species 
and Mo I u^ Att utus Say second dominant in the Rio Grande Valley and in 
San Mig'j.ei a,nci Mora Counties, Damage to alfalfa and sweet clover in 
San Miguel County ranged up to 40 percent total leaf injury with heavier 
marginal injury, 
Colora.do,i/ (July 27-Aug’ast 2): Hatching of second-generation M, mexicanus 
was under vray in casi.ern Colorado, east of Elhert County. Populations 
vfQTQ generally light ivnd averaged less than 10 per square yard in the 
infested fields, M. mexicanus vras JO percent dominant in the above area 
and M, hivittatus and M, difforentialis were next in importance. Local 
migrations have resulted in reductions in grainfield populations and 
increa.oos in v/eedy fields, corn, feed crops, alfalfa, and sugar beets. 
Damage to date has been very light, 
Texan,—/ (July 27-August 2): Pirst-, second-, and third-instar nymphs of 
second-generation M^, mexicanus vrevo present in the Texas Panhandle in 
small numbers General populations in Randall, Collingsworth, ITheelor, 
Hemphill, Potter, Co.rson, a:ad Armstrong Counties averaged light in 
intensity. M mexicanus represented SO percent of the grasshoppers 
present and M, dif f erontialis 15 percent. Damage wa.s very light duo to 
the excellent condition of the vegetation, (August 3“9)j A survey of 
the northern tier of counties in the Texas Panhandle shov/ed a general, 
li^lit infostalion of first-generation adult M, mexicanus , A light in- 
festation of second-generation H. mexicanus nymphs, averaging 5 
square yard, was present, 
Oklahoma,^ (August 3~9)* Light populations of second-generation M, nexi- 
canus v/erc reported in Cimarron, Harper, and Texas Counties in north— 
\\rcstcrn Oklnhona., Pirst-, seconr’-^ pjicl third-instar nymphs averaged 
5 per sa^uaro yard in the infested areas in these counties, 
Kansas,^ (July 27-August 2): Only very light, minor flights of M, noxi- 
canus vrere observed during the v;eok. Second-generation M, mexicanus 
was observed west of Hess County, Populations were lighter than in 
~~u 
’.'HiCre no naJ;ie is given after the State the report is by B, M, Gaddis 
and assistants. 
