2IO ECONOMIC ENTOMOLOGY 



Control. — Same as for imported cabbage worm (Pieris rapes), p. 176. 



Sugar Beet Web Worm (Loxostege sticticalis Linn.)- — Injurious in 

 Manitoba, Saskatchewan and Alberta to alfalfa, turnips, rape, onions, 

 peas, cabbage, and other garden plants; in the middle western states 

 and the prairie provinces on sugar beets. A native of Europe and 

 Northern Asia. 



Adult. — A purplish-brown moth, with darker and paler bands; wing 

 expanse i inch. May and June. 



Eggs. — Broadly oval, 3^^5 inch long, pale green; laid in clusters 

 (3-10) on the leaves. 



Larva. — One inch long, dark with a white stripe down the back and 

 one on each side, marked with many black and white tubercles. 



In Colorado the first brood of larvae feed on pigweed and alfalfa in 

 June; the second brood appears in July, and sometimes injures beets; 

 the third brood about middle of August is most injurious. Most of 

 the larvae hibernate in the ground m long silken tubes. 



Pupa. — The pupa is formed in early spring in the silken tube. 



Greenhouse Leaf Tyer {PhlyctcBnia Jerrugalis Hbn.). — A serious pest 

 in greenhouses to violet, rose, carnation, and other plants; and outdoors 

 to beet, celery, lettuce, sweet pea and other plants. It ties up con- 

 tiguous leaves by webs and feeds within, skeletonizing the leaves. 

 Widely distributed. 



Adult. — A small moth, ^ inch wing expanse; fore wings light 

 brown and with blackish cross lines; hind wings grey with darker 

 margins. 



Eggs. — Translucent, oval disks, 3^^2 inch long; laid in clusters of 

 8 to 12; hatch in 19-20 days. 



Larva. — Three-fourths inch when full grown; greenish white with a 

 green line down the back and another on either side; head straw colored; 

 mottled. Full grown in 3-5 weeks; feeds mostly at night. 



Pupa. — Formed within the webbed leaves. 



Control. — Spray or dip the plants in solution of arsenate of lead as 

 soon as larvae are observed; hand pick infested leaves. 



Crambid^ (Close-wings) 



Root or Sod Web Worms {Cr ambus spp.).^ — In July and August 

 many small greyish moths with closely folded wings and with project- 



