~4o3~ 
and marginal vegetation, Choppers were moving into fields and slight 
damage was apparent in most areas. Populations in alfalfa averaged 
about 35 P er square yard, along roadsides and field margins about 45, 
and in small grains and stubble fields about 8 per square yard. 
M. mexicanus was reported ovipositing in Redwillow County July 8. 
Prom light to moderate dispersal of M. mexicanus was reported daily 
in the counties of southwestern Nebraska, moving in all directions 
except due north. (July 13-19)* M. mexicanus and M. bivit tabus 
in the northeastern portion of _the Sta,te were practically 100 percent 
adult. Approximately 50 percent of M. differcntialis had reached 
the adult stage and mating was reported on July 17* Marginal damage 
to alfalfa in the more heavily infested counties was much more noticeable 
and some leaf damage to corn was evident as grain was harvested. 
Light flights of M. mexicanus were reported dally in southwestern 
Nebraska; however, they wore lighter than in previous weeks. In the 
south-central and eastern parts, most species were 90 to 95 percent 
adult and M. different ialis was 60 percent adult. 
u . “ 
Nevada. (July 6-12): Scattered bands of adult M. occidental is were reported 
in the infested areas of Nye, Lander, and Eureka Counties. A check 
of the situation in Churchill, Lyon, Nye, and Washoe Counties revealed 
populations of noneconomic importance. Approximately 90 percent were 
adults and oviposition had begun. 
1 / 
California* (July 13”19)* Infestation of M. monicanns in Imperial County 
\iras very light, in _ comparison. with previous years. Infestations, 
predominantly M« devastator Scudd. , were rather heavy in San Diego 
. County. In Fresno and Tulare Counties they were moving by short flights 
from range lands into citrus and other crops. Migrations of this 
species from range land into crops, was reported in Kern County. 
Infestations in Calaveras, Tuolumne, and Mariposa Counties v ere much 
lighter than lent year. Pedal eonotus enigma Scudd. were still very 
numerous in relatively restricted areas in the Panoche district of 
San Benito County. Grasshoppers were not as populous in Humboldt 
County as they were in 1940 and are no longer a menace. 
S. Lockwood (July 9 ) * Adults of M. devastator are reported 
to be. migrating from range land. to cropped areas in central Siskiyou 
County. Short flights from grainfields to citrus arc occurring in 
the Sierra, foothill region of Tulare County. 
Idaho. B. M. Gaddis (July 6—12): In southwestern Idaho localized concentrar* 
tions of M, mexicanus in alfalfa fields ran to 200 per square yard 
and in several instances, damage was severe to alfalfa, a,nd grain in 
fields bordering on the range. (July 13 — 19)* M.' mexicanus was the 
dominant species in western Idaho, with practically all in the adult 
stage. In eastern Idaho, where M. f omur— r ubrum is dominant, the 
species ranged in development from second— instar nymphs to adults. 
Utah. G. 3P. Knowlton and F. C. Harnston (July 5 )' Damage continued to be 
severe throughout the eastern part of Millard County, where second- 
crop alfalfa has been severely injured on several thousand a,cres. 
Moderate to severe damage is occurring on potatoes and corn in Piute 
and Beaver Counties. At Callao, in western Juab County, an unusually 
severe infestation of M. bivit tatus and M. packardii is present over 
