noticeable between July 1st and October Ist. Thorough cultivation 

 along approved lines is a decided help in connection with this pest, 

 coupled with a proper rotation. As is well knoM'n, many birds feed 

 upon White Grubs, and when practicable it is a desirable thing to 

 turn hogs into a field after the crop is harvested. They root out 

 the grubs and devour them eagerly. Page 49. 



A very large "Weevil" belonging to genus Sphr]i()i)]i(>nix has 

 worked locally on our wheat this year. See page 45 



The Green-striped Maple Worm has in at least one instance de- 

 foliated many Maple trees. 



Not insects, but coming within our province, upon the ground 

 of their being plant pests, we have to report naked snails or "slugs" 

 as being unusually abundant ?nd troublesome during 1912. See 

 page 111. 



During the winter of 1911, field mice were especially destructive, 

 one large land owner losing several acres of young maples as a re- 

 sult of the activity of these creatures. See page 88. 



There has been the usual quota of complaints of gophers and 

 moles, the latter at times being quite troublesome. 



SPECIAL WORK. 



Grasshopper Experiments: During 1911 we had in the field 

 four workers and in 1912 two experts and an assistant. We regard 

 this as the most important work of the biennium and feature it as 

 such in this report. See page 1 and colored plates, I, II, and III. 



Clover-seed Chalcis: This insect is quite commonly called 

 "weevil" by farmers and reduce? the yield of clover seed in Minne- 

 sota to the extent of many thousands of dollars. Our Adams Fund 

 worker, Mr. Williamson, has been investigating this insect both in 

 the laboratory and insectary, as well as carrying on co-operative 

 field experiments with farmers in diff"erent parts of the state. 

 These investigations begun several years ago will, we hope, be 

 shortly completed. See page 52. 



Larch Saw Fly : Mr. Ruggles, Assistant Entomologist, is con- 

 tinuing work with this pest which is destroying annually in Minne- 

 sota millions of dollars worth of tamaracks. See page 62. He is 

 also studying the life history of a species of an Elm Twig Borer. 

 See page 54 for discussion of certain shade tree pests. 



Spraying for Codling Moth and Plum Curculio : Our con- 

 stituents urge upon us the necessity for impressing upon fruit 

 growers the fact not only that there is actual profit in spraying, but 



