2l6 ECONOMIC ENTOMOLOGY 



Adult. — Greyish buff or pale ochreous, marked with fuscous 

 spots; ^ inch wing expanse; July- August. 



Eggs. — Laid in May on leaves, stem and on sheath of inflorescence. 



Larva. — Pale yellow or bluish grey, marked with black tubercles 

 bearing bristles; head and thoracic plate bluish black; 3^^ inch long. 

 Larvae first web the flower-heads together and feed on the flowers 

 and unripe seeds; they then enter the hollow stems and feed on the soft 

 pith. 



Pupa. — Formed within the hollow stem in a silken cocoon. Dura- 

 tion 2-3 weeks. 



Control. — Spray carefully the flower-heads as soon as webbing is 

 observed with an arsenical, j 



iEcERiiD^ = Sesiid^e (Clear Wings) 



Peach Tree Borer {Synanthedon exitiosa Say). — (Consult Cir. 54, 

 Div. of Ent., U. S. Dep. Ag.; Bull. 170, Cornell Ag. Exp. St.) A native 

 insect occurring wherever peaches are grown east of the Rockies. 



Adult. — A slender dark-blue clear-winged wasp-like moth. Male 

 moth with wings transparent and bordered with steel blue; expands 

 I inch. Female moth with fore wings blue and clothed with scales; 

 hind wings transparent resembling the male; a broad orange band 

 about middle of abdomen; expands 1)2 inches. July-September. 



Eggs. — Minute, oval, yellowish-brown; and hexagonally sculp- 

 tured; truncate at one end; deposited on the bark near surface of 

 ground. Each female may lay from 300-400 eggs; hatch in about 

 10 days. 



Larva. — One inch long when full grown, robust, yellowish-white, 

 with head and first segment white. Young larva bores into sap- 

 wood at or below surface of ground, and continues feeding well into 

 the fall, and after hibernating resumes feeding in spring, reaching full 

 growth from July ist-September. Exudation of gum mixed with 

 bits of bark and excrement. 



Pupa. — Cocoon-like cell elongated, made of grass and bits of bark 

 attached with gum and threads of silk. Duration about 3 weeks. 

 One generation each year. 



Control. — Probe or cut out the caterpillar in fall or early spring; 

 mounding up the earth about base of tree in spring; protect trunk 

 with paper or wire covering or netting (see Ohio Bull. 329). 



