SIXTEENTH ANNUAL REPORT OF STATE ENTOMOLOGIST 27 



Colorado Potato Beetle {Leptiiiotavsa decemlineata Say). — 

 Potato beetles were more plentiful than for several years. Their 

 unusual abundance, coupled with the scarcity of Paris green, caused 

 considerable loss in some districts. Calcium arsenate and zinc arsen- 

 ite were used with grood success in place of Paris green. 



Flea Beetles {E])itrh sp.). — Flea beetles were very abundant, 

 causing considerable anxiety to owners of war gardens during the 

 spring months. In most cases the injury was outgrown before the 

 growing season was over. 



Nuttall's Blister Beetle {Cantliaris nuttalli Say). — This brightly 

 colored beetle was reported as cutting the blossoms and buds of 

 beans. Some damage was also done to alfalfa. 



Wireworms (EJaferidae). — Wireworms were more abundant 

 than usual, attacking many different kinds of crops. Wireworm 

 injury of an uncommon sort was reported from Three Forks where 

 sprouting peas were riddled so badly that a very poor stand was 

 secured. 



Sunflower Beetle (CliTj/somela exclamationis Fab.). — For the 

 past two seasons, both wild and cultivated sunflowers have been 

 attacked by this beetle. 



BEES AND WASPS (HYMENOPTERA) 

 Currant Sawfly {Gjpjinonychus appendiculatus Hartig). — The 

 larvae of this sawfly were reported as defoliating currants and goose- 

 berries. 



Leaf-Cutter Bees {,]\[egachile sp.). — Each year numerous letters 

 are received concerning this interesting although destructive bee. 

 In the shelter-belt plantings in eastern Montana it is a very serious 

 pest, as it nearly defoliates the ash tree, which otherwise is one of 

 the most desirable trees that can be planted in the plains area. 



REVIEW OF THE YEAR 1918 

 Each year has its outstanding entomological incidents or feat- 

 ures. In addition to certain insects which are regularly present 

 and destructive, there are those that come unexpectedly, and it is 

 often impossible for us to determine in advance what the principal 

 interests are to be. The season of 1918, on the whole, was an active 

 one, there being many pests that were brought to our attention 

 and a few that were widespread and very injurious. 



