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GENERAL EEEEERS 
GRASSHOPPERS (Acrididae) 
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Arizona* B. M. Gaddis and assistants (Jime 1—7)* Rather severe infestation 
of Melanoplus mexicanus Sauss, is reported in the Sunset-Bonita and 
Dos Cahezos districts in Graham and Cochise Counties, covering an 
estimated 2,000 to 3»000 acres of cropland and 192,000 acres of range 
land. Range land populations ane from 10 to several hundred per square 
yard and in the more heavily populated spots mosquito, willow, yucca., 
and other plants have already 'been completely defoliated, M, differ- 
ent ialis Thos, is now the dominant species in Maricopa County. Pop>ula— 
tions range from I 5 to 30 por square yard in fields and from 10 to 75 
along margins and ditch hanks. Damage to young cotton and alfalfa 
is becoming evident. Hatching of M, mexicanus is complete in Pinal, 
Graham, and Ooqhiso Counties, v/horo this species represents 75 percent 
of the granshoppor populations. Approximately 60 to SO percent are 
adults and the remainder fourth- and fifth- ins tan nymphs. 
C. D. Ichcrt (June 2l): Extremely hca.vy population of M, mexi canus 
in the Sulphur Springs Valley around Wlllcox involving more than ^00 
square miles. Range is stripped and the iioxopcrs arc now working on 
mesquite and yucca.. Populations range as high a.s 200 to the square 
yard, 
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Hew Mexico, (June 0-14): Hatching is about complete in the mid-Rio Grande 
Valley of central Hew Mexico hut is only slightly over SO percent 
complete in the northern counties, M, hivittatus represents about 
65 percent and M, mexicanus approximately 20 percent, 
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Colorado, (June S—l4) : Infestations in southeastern Colorado are reported 
to he generally light, except in a few small areas. In the eastern 
half of Baca County from Campo northward to the Prov;ers County line, 
a heo.vy infestation of M, mexicanus is present with field populalions 
ranging from S to 120 per square yo.rd and marginal populations up to 
100 per square yard. Very little crop damage is in evidence even though 
grasshoppers are present in grain crops, M. mexi canus makes up 95 
percent of the population. In the irrigated arca.s of southoa.storn 
Colorado, populations are comprised of M, diff oront ialis , M, hivitta.tus 
Say, M, paxkardii Scudd, , and M. moxican.us , Hoa.viost populations were 
noted south aaid oa.st of Pueblo, Pueblo Comity, Population counts were 
as high as 25 per square yard in fields and up to 200 per square yard 
in margins, A few wheatfields showed as high as 20 percent marginal 
damage. Dryland farming areas are generally very lightly inf ested carcept in 
small, localized areas, 
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Cexas, (June 0-l4) : A survey of the crop areas in the counties of the. north- 
western Texas Panhandle revealed light to threatening infestations, 
vrith the heaviest populations confined for the most part to margins. 
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Where no name is given after the State the report is by B, M, Gaddis and 
assistants. 
