152 MONTANA EXPEKIMENT STATION 



to winter wheat was reported from Plains in April. An examination 

 disclosed numerous black capsids sucking the juice from the plants, 

 which became spotted at the point of attack. But little loss resulted 

 from the attack. 



Green Apple Aphis {Aphis jjmni De G.). Present in about normal 

 numbers. 



Cabbage Aphis (Aphis hrassicae L.). Not as injurious as in 

 1914. 



Grain Root Aphis (Forda ocddentalis). This plant louse occurs 

 very commonh- upon the roots of wheat and is often blamed for the 

 injury caused by Brachijcohis hitici. In no instance has Forda 

 been observed to seriously injure its host plant. 



Western Grain Aphis (Brachycohis fritici Gillette). This aphid 

 which has been increasing and spreading in Montana for several 

 years was highly injurious to winter wheat, in some instances com- 

 pletely destroying entire fields. Considerable time was spent in 

 studying this important pest and its life history and a method of 

 control have been Avorked out. Absolutely clean summer fallow is 

 a sure preventive of injury. 



Aphids in heads of grain. During August daily reports were 

 received of aphids infesting heads of grain. Generally the specimens 

 sent in were badly mashed and accurate determination was not always 

 possible. Genera recognized were Jlacrosiphmn, To.vopfcra and 

 Aphis. Little damage was done as the grain was well advanced 

 when the insects first appeared in numbers. 



Sugar Beet Root Louse (Feinphi^iis hetae Doane). Investiga- 

 tions concerning this important sugar beet pest were carried on 

 under the Adams fund as in previous years. It is hoped that a 

 system of irrigation may be worked out which will reduce injury 

 from this insect to a minimum. 



Woolly Aphis (Schizoneura lanigera Hanseman). In the Bitter 

 Root A'alley this insect appears to be spreading and becoming more 

 firmly established each year. 



LEPIDOPTEEA 

 Army Cutworm {Choriza^rotis auxiliaris Grote). ]\Iany sec- 

 tions of the State were devastated b}' armies of cutworms belonging 

 for the most part to the above named species. This was by far the 



