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ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 47 



Fi»r. 42. — Nantucket pine moth: damage to pine shoots by the small, 

 yellowish larvae of this moth. Red pines and jack pines are favored by this 

 pest. 



Control Measure 2 (end of circular). Spray should be ap- 

 plied in mid-April and late June. Infested shoots should be re- 

 moved and destroyed. 



Zimmerman Pine Moth, Dioryctria zimmermani (Grote). — 

 The light gray, reddish-yellow, or greenish larva of this species 

 tunnels under the bark around limbs and branches of pine, espe- 

 cially at the whorls, where it does serious damage. Presence of 

 larvae usually can be recognized by the great quantity of pitch 

 over the tunnels. Scotch and Austrian pines are particularly 

 susceptible to this insect. 



The maximum flight of the adults, which are nocturnal, 

 dark gray moths, occurs about the middle of August, when the 

 female deposits eggs on the bark of pine. The larvae usually 

 work where bark is thin. Pupation occurs in the larval tunnels. 



Control Measure 13 (end of circular) applied in early August. 



