■4oi- 
G E IIS E A I ESBDSES 
GRASSHOPPERS (Acriclidae) 
Arizona* B. M. Gaddis and assistants (July 6-12): Heavy infestation in 
the Sulphur Springs Valley of Cochise and Graham Counties, in 
southeastern Arizona, remains about the sane. Surrounding areas showed 
increased Melanoplus mexicanus Sauss. populations, indicating some 
dispersal, with adult hoppers numbering as high as 10 to 15 per square 
yard. An infestation of Schistocerca sho shone Thos. developed in the 
mesquite flats of the lower portion of the Sulphur Springs Valley, 
where orchards and field crops on isolated farms wore attacked, 
M, mexicanus was the dominant species throughout the southern half of 
the State, which contains the gr cater part of the farmed areas of 
Arizona* The species represented approximately 75 percent of the 
*hopper populations, while M, differentials Ihos, and Trimerotropis 
pnllidipenni s Burm, comprised 15 and 10 percent, respectively, 
All M, mexicanus were adults and in cultivated fields egg deposition was 
in progress. M, differentials is confined generally to scattered 
areas in the irrigated sections of Maricopa County, A severe infesta- 
tion of M. bivittatus Say was reported in the small mountain valley 
areas along small streams and in irrigated and dry farm fields in 
southern Apache County* (July 13-19)* Infestations, of which M, bivit- 
tatus was the dominant species, in southern Aposhe County remained 
serious, with heavy populations in fields and meadow areas of the 
small valleys. Heavy populations also were reported on the Apache 
Indian Reservation. Infestations of lighter intensity were reported 
from Havajo County. M, mexi earns in Cochise and Graham Counties 
is estimated to infest approximately 1,000,000 acres of range and 
desert lands and 5*000 acres of cron lands, 
1/ 
Hew Mexico. (July 6—12) : In the west— central counties of Valencia and 
Socorro, M. differential is comprised approximately ~J0 percent and 
M* femur- rub rum Deg, about 20 percent of the * hopper populations, 
of which 10 percent were in the adult stage. Populations in alfalfa 
fields ran as high an 25 per square yard and along field margins 
to 75 P cr square yard. A few scattered Dissosteira, longipcnnis Thos. 
were reported at widely separated points in Chares, Roosevelt, and 
Lea Counties, 
1/ 
Colorado* (July 6—12); An infestation of Camnula pellucida Scudd. in 
Grand County, north— central Colorado, is estimated to cover from 
2,500 to 3*000 acres in the low meadowlands along the Colorado 
River around Kremmling, Localized populations numbered as high as 
J^000 per square yard, but adults were beginning to scatter, Ifemage 
.to" 1 alfalfa and native hay was severe. (July 13-19)’ In northeastern 
Colorado migrations into crops have begun with completion of the grain 
harvest and damage to barley, rye, and wheat increased noticeably 
during the week. Very light population increases due to flights 
were noted in Adorns, Arapahoe, Elbert, and Lincoln Counties, indicating 
that a gradual westward migration was still in progress* An examination 
1 / Where no name is given after the State the report' is by B. M, Gaddi's and 
assistants. 
