Injurious Insects and How to Control Them. 79 



36 Elm borer {Saperda tridentata). Diseased or dead bark and in inner 

 portions wliite, flattened legless grubs, which frequently cause considerable 

 injury. Beetles appear from early May till latter part of June. 



Treatment: cut and burn badly infested trees. Protect valuable trees 

 with carbolic soap wash during May and June. 



37 Elm snout beetle (ilagdalis harbita). Thiclj, fleshy, legless grubs 

 worlving in inner bark of elm. Follows attack by the elm borer and occa- 

 sionally is very abundant. 



Ti-eatment: burn badly infested trees and keep others vigorous. 



38 Fall web worm (Hypliantria cunea). Web tents in July and August 

 Inclosing leaves on the tips of branches, the eaten foliage turning brown. 

 Attacks many trees. 



Treatment: destroy webs and their inhabitants or spray foliage of 

 affected limbs with poison. 



39 Bag worm (TTiyridopteryx epTiemercefonnis). Defoliated evergreens 

 and other trees are found infested with curious cocoons or bags containing 

 caterpillars in late summer and fall. Occurs in vicinity of New York city. 



Treatment: collect and destroy bag worms or spray with poison. 



40 lieopard moth {Zeuzera pyrina). Whitish, black spotted caterpillars 

 making large burrows in various ti-ees. A bad pest about New York city. 



Treatment: dig out young borers. Kill others with carbon bisulfld. De- 

 stroy badly infested trees. 



41 Bronze birch borer (Agrilus anxitis). If injured bark is examined, a 

 Blender flat headed grub will be found running buri'ows in all directions 

 in the inner portions. White and other birches are attacked. Very inju- 

 rious at present in Buffalo. Beetles appear in June. 



Treatment: cut and burn badly Infested trees. 



Garden Insects. 



42 Colorado potato beetle {DorypTiora 10-lineata). Stout yellowish beetles 

 with black striped wing covers appear in early spring, feed and deposit 

 yellowish eggs in clusters on under surface of leaves. The reddish, black 

 marked grubs also devour the foliage. 



Treatment: handpicking; spray vines with poison. 



43 Squash vine borer {Melittia satyriniformis). Wilting of one or more 

 runners is caused by a whitish caterpillar boring in the stem near the root. 



Treatment: slit the softer, infested portion of the vines, remove the 

 borers and cover the wounded part with earth. Protect young plants with 

 netting. 



44 Striped cucumber beetle {Diahrotica vittata). Yellow beetles about 

 ^ inch long, striped with black, occur in numbers on cucumber and 

 squash vines. 



Treatment: protect young vines with netting. Dust vines with ashes, 

 plaster of paris, etc. Poison trap crop of squash. 



