52 MONTANA EXPERIMENT STATION 



Ticks (Derrnacentorsp.). Both the wood-tick (Dermacento 

 venustus Banks) and the elk-tick {Derrnacentor alhipictvs Fa.ck.) 

 have been reported as injurious to stock. 



OETHOPTERA 



Grasshoppers {Acrididae). In the lower Yellowstone valley 

 an unusually severe outbreak of grasshoppers occurred. In some 

 cases whole fields of alfalfa, flax and grain were destroyed. The 

 infested territory was visited by the state entomologist and control 

 measures were recommended. Hopper-dozers were used with good 

 results. Considerable injury by grasshoppers was also reported 

 on the Crow Indian Reservation. 



HEMIPTERA 



Chinch Bug (Blissus leucopterus Say). Although found in 

 considerable numbers in the vicinity of Glasgow in 1911, none were 

 reported in 1912. This may be accounted for by the fact that 

 chinch bugs are numerous only in dry seasons, whereas the spring 

 of 1912 was unusually wet and much of the area infested in 1911 

 was under water for weeks. 



Owing to the long distance from Bozeman to Glasgow and the 

 lack of money for traveling expenses, no study of the chinch bug 

 was undertaken. Inasmuch as this insect may prove highly injur- 

 ious in a dry season, it is of prime importance that such a study 

 be undertaken at once. 



Buffalo Tree Hopper ( Cerasa bubahis Fab.). Apple-tree 

 twigs marked with the characteristic slits within which this insect 

 lays its eggs were sent in from several places in the State. 



Cicadas (Cicadidae). Platypedia putnami Uhl., the species 

 found so abundantly at Thompson Falls in 1911, was this year sent 

 in from Camas. Tihicens cruentifera Uhl, as usual was quite 

 plentiful in the Bitter Root Valley. 



The Greenhouse White Fly {Aleyrodes vaporariorum 

 Westw.). This common greenhouse pest has to be fought con- 

 tinuously in Bozeman greenhouses. Several complaints of white 

 fly injury were received from other sections of the State. 



The Apple Aphis {Aphis pomi De G.). Taking the State 

 SIS a whole, this was the worst insect pest of the year. It occurs 



