TWENTY-THIRD REPORT OF STATE ENTOMOLOGIST 13 



(lusting with arsenic compounds. It is possible, and even probable, 

 tliat the insects will die off naturally this winter and not cause 

 ti'oiil.l.' in l!i:n. 



THE VIRGINIA CREEPER LEAF-HOPPER 



Ki ytludiieuia y.iczac Walsh 



From Livingston eastward along the Yellowstone River during 

 recent years, we have received inimerous complaints that this insect 

 is destroying much-prized Virginia creepers. These insects multiply 

 to astounding numbers and by their attacks destroy the foliage, which 

 turns whitish, dries up, and falls off. If the vine is shaken, the 

 insects arise in a cloud, scatter, and soon settle again. Rose bushes 

 are sometimes similarly attacked by a related insect. 



This pest appears to ])e spreading westward. Apparently it has 

 not yet reached Bozeman. The insect is difficult to control at reason- 

 able expense and further attention should be iriven to it. 



SHELTER-BELT INSECTS 



In recent years there has been great interest in ])lanting shelter 

 belts on ^Montana farms. During the past three years Professor 

 Harrington, head of the Department of Horticulture, has cooperated 

 in selecting and planting such shrubs and trees on nearly two 

 thousand farms in Montana. These plantings are creating a new 

 insect pest problem. 



The shrubs and trees that are being planted are the following: 

 caragana, Russian olive, box elder, laurel willow, golden willow, 

 native cottonwood, Canadian poplar. Northwestern poplar. Chinese 

 elm. American elm, green ash, Colorado blue spruce. Black Hills 

 spruce, jack pine, Scotch pine, western yellow pine. 



Some of the insects involved are the following : plant lice of many 

 kinds, gall aphids. leaf-cutter bees, leaf beetles, blotch miners 

 (Chrysomellidae), leaf caterpillars, canker worms, wood borers, scale 

 insects, sawflies, l)lister beetles, June beetles, bark boring cutworms, 

 leaf-hoppers, and red spiders. This is a formidable array when it is 

 realized that under some of these names a dozen or more separate 

 insects are included. 



To work out the problem of these pests would call for the full 

 time of at least one man, but the pressure of other work has not 

 permitted anything to be done so far. Some of the insects involved 

 are already known as pests of shrubs and shade trees in the gardens 



