-139' 
MOHMON CRICKET ( Anabrus simplex Hald> ) 
Montana. B. M.Gaddis and assistants (May 5-H)j Crickets began to hatch 
in Big Horn County about the 15th of March. The hatch is now complete 
in all areas, with the exception of the Pryor and Big Horn Mountains. 
It is believed that there will be approximately 1,500»000 acres of 
heavily infested lands in Big Horn County this season. Crickets were 
reported hatching in Chouteau County the first part of this week. 
Probably some 65.000 to 70,000 acres will be heavily infested in Chouteai 
County* . The first hatching of crickets was reported in Sanders County 
on March. 2 and crickets are now in the third to fifth instars. About 
150.000 acres of land are moderately and heavily infested in the county. 
In Yellowstone County, crickets are now in the second to fourth instars; 
, they were reported to have commenced hatching about March 28. About 
100.000 acres of lands are heavily or moderately infested. In Carbon 
County 32*000 aeres are estimated to be infested. In Lake County it is 
expected that approximately 6.000 acres will be moderately or heavily 
infestedp About 12,000 acres of heavily to moderately infested lands 
are located in the southern part of Phillips County in the vicinity of 
Landusky, It was thought that Sweet Grass County had been entirely 
cleaned of crickets; however, it is now reported that an infestation 
has aopeared this spring in an area where there were no crickets last 
year. Eergus, Judith Basin, Stillwater, Golden Valley* and Musselshell 
Counties are believed to be almost free of crickets. It appears that 
in areas in Montana vihere large numbers of eggs were found last fall, 
the infestation at present does not seem to be very heavy. Examples 
of this are the Cama.s Prairie area of Sanders County and the south 
Hardin area in Big Horn County. On, the other hand, places that 
apparently had no crickets last year are showing heavy infestations, 
(May 19 - 25)5 Larger numbers of Mormon crickets are appearing and 
considerable migration is occurring in Sanders County. The infesta- 
tions in Yellowstone County appear to be scattered, with populations 
light. Very few migrations have been noticed in Big Horn County, 
Idaho, (May 5-il)s Cricket populations in Payette County are somevrtiat below 
anticipations. In some portions of Gem County the hatch has not been 
large, ranging from 25 to 80 percent. In other parts of the county 
large populations were present just prior to heavy spring rains, but 
some bands disappeared after the rains. Large cricket populations are 
present in some areas of Washington County, Cricket populations make 
the situation in the Midvale area at present especially acute. Migra- 
tions from the lower Crane area are now taking place. Crickets are 
not present in Twin Palls County in as large mnnbers as was anticipated 
by the fall survey, (May 19—25),! Adults were reported in the western 
part of the State, in Washington County, on May I 6 , In the eastern part, 
in Clark and Fremont Counties, the hatch is now conplete. Adult crickets 
were reported in Madison County on May 24, 
Wyoming, (May 5-11.)! Crickets in most areas are now in the second and 
third instars; however, in lower elevations in Hot Springs County some 
crickets were observed in the fourth and fifth instars. An extensive 
LIBRARY 
STATE PLANT BOARD 
