LETTER OF TRANSMITTAL 
STATE EXPERIMENT STATION, 
St. ANTHONY Park, MINN., 
DECEMBER I, IQIO. 
To His Excellency, A. O. Eberhart, St. Paul, Minn. 
DeEaAR Sir: I herewith present the Thirteenth Report of the 
State Entomologist of Minnesota, covering work of this office and 
insect conditions during 1909 and 1910. For the sake of economy 
this report is now printed biennially. In addition we print from 
time to time and mail to farmers and fruit growers circulars of 
information and press bulletins, planning to have these reach them 
at the time when most needed, and thus be more helpful than if we 
delayed publishing until the issuing of the printed report. This 
plan appears to work satisfactorily. 
GENERAL INSECT CONDITIONS DURING 1909 AND Ig10: Dur- 
ing 1909 native species of grasshoppers were abundant and trouble- 
some in various localities throughout the state, complaints reaching 
this office from St. Cloud, Fertile, Crookston, McIntosh, and from 
localities in Otter Tail and Norman Counties. These complaints 
were prophetic of the trouble in store for us in rg1o, the present 
year, in which grasshoppers have been more troublesome, causing 
decided loss locally, than for many years. These are native varie- 
ties, and while they have not possibly noticeably reduced the yield 
of grain, in the state at large, they have, in certain localities, cut 
down the crop of farmers from two-thirds to four-fifths, some 
individuals having become utterly discouraged in consequence. The 
output of flax, however, has been markedly diminished this year, 
which diminution is due almost entirely to the attacks of grass- 
hoppers. Where practicable your entomologist has helped deserv- 
