TWENTY-THIRD EETOKT OF STATE EXTOMOLOUIST 



Insect Pest 

 Grasshoppers 

 Grasshoppers 

 Grasshoppers 

 iloriiion i-ric'kets 

 Mormon crickets 



County 

 Cuater 



Judith Basin 

 Bcaverlioad 

 yanilt-rs 

 Sanders 



GRASSHOPPER FORECAST FOR 1931 



In past years tlie Kxpcrimeiit Station has done a great deal of 

 work on grasshoppers, particularly throucrh Doctor J. R. Parker who, 

 within the past two years, has resigned from the Experiment Station 

 and taken up duty under the United States Bureau ot" Entomology 

 wiih lieadquarters at Montana State College. While Doctor Parker's 

 work on grasshoppers will he primarily that of research, his office 

 gets information on grasshopi)er occurrence and damage in Montana 

 as well as in the other western States, and in this way the State 

 entomologist's office is relieved of a considerahle amount of work. 



While no detailed and complete survey of grasshopper abundance 

 in Montana was conducted during the season of 1930, some informa- 

 tion gathered by Doctor Parker indicates that if weather conditions 

 are favorable to these insects during the spring and early summer of 

 1931, grasshoppers may be expected to cause local damage to crops in 

 many parts of the State. 



In Beaverhead County, along the Montana-Idaho line, the War- 

 rior grasshopper {Cawniila pellucida Seudder) was i)resent in large 

 numbers during 1930, and in one locality near Lakeview it was neces- 

 sary to scatter 40 tons o\' poisoned bran mash to save the hay crop. 

 Large nuiiib(>rs of eggs were laid in the area around Red Rock Lake 

 and in the vicinity of Henry's Lake, just over the Idaho boundary. 

 Some poisoning will proliably be necessary next spring. 



In western Montana, in Ravalli, Missoula, Lake, and Flathead 

 counties, more grasshoi)pers were present during the late summer than 

 at any other time since the series of bad outbreaks which began in 

 1917 and ended in 192.'). The Red-legged grasshopper (Melanoplus 

 feniur-ruhruDi DeGeer) and the Two-striped grasshopper (Melano- 

 plus hiviitatus Say) were especially tiumerous in the irrigated sections 

 and may be expected to cause local damage to irrigated crops in 1931. 



In the ''Triangle" area in north-central Montana, increased 

 abundance of grasshoppers Avas noted in Pondera, Chouteau, Libei-ty, 

 and Tlill ennnties. Tn the irrigated section in the vicinitv of Conratl 



