Eleventh Annual Report of the State 

 Entonioloorist of Montana 



INSECT PESTS OF 1913 



The season, of Idl'o was about normal in respect to the abund- 

 ance of insect pests. As usual some species appeared in more than 

 ordinary numbers and several new to Montana were discovered. A 

 brief record of the insects which were of particular economic impor- 

 tance in 1913 fellows. For the sake of convenience they are classified 

 by orders. 



ACAKIN.V 



Leaf Blister Mite {Kriop/iijses pjjrl Pi;st.). In neglected orchards 

 in the liitter Root Valley this was the most injurious insect pest 

 of fruits. On both apple and pear it was worse than for several 

 years. Orchards which received the stroni^ lime-sulphur spray just 

 before the buds opened were practically uninjured, which goes to 

 emphasize the im[)ortance of the d<jrmant spray in the spraying 

 program of the successftil orchardist. 



Plum Gall Mite (Ei-iopJiyses padi Nal.). This close relative of 

 the leaf blister mite w^as very abundant in the eastern halt of the 

 State. We have observed it for a number of. years in the Yellowstone 

 Valley and this year it was sent in from I.ewistown. Tt distorts 

 the leaves of bcith cultivated and wild plums, and in many instances 

 causes a loss of part of the fruit. 



The Bulb Mite (Rhizogijphiis liyaclnthl Boisduv.). This old- 

 world pest was found in a shipment of imported bulbs consigned 

 to a Montana florist. 



Clover Mite (Bryobia pratensls Garman). Some injury to sweet 

 peas and clover was caused by the clover mite during June and 

 July, but it was as a household pest that it attracted the most atten- 

 tion. In Missoula and in other towns it swarmed over the exterior 

 and into the interior of houses, causing much annoyance to the 

 housewives. 



CORRODENTIA 



Book-louse {Troctes divinatoTia Fab.). A sample of w^heat cidu- 

 tained in a glass exhibition jar was found to be alive with book- 



