54 



ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 47 



Fig. 39. — Red-headed pine savvfly: four larvae and a pupal case (arrow) 

 on pine. Rows of black dots are conspicuous on the pale yellow larvae, which 

 consume the needles of young pines and may cause serious damage to the 

 trees. (Photograph from Pennsylvania State University.) 



White-Pine Weevil, Pissodes strobi (Peck). — This pest pre- 

 fers white pine, but it feeds upon Scotch and jack pines, also. 

 Damage by the weevil is readily recognized by dead and dying 

 terminal leaders of infested trees. The overwintering adults, 

 each only about one-fourth inch long, feed on terminal twigs in 

 the spring. At this time of year, the female deposits eggs on the 

 terminal twigs. The larvae feed under the bark in the same gen- 

 eral region, causing enough damage to kill the twigs. 



Control Measure 2 (end of circular) about April 15. 



Pine Needle Scale, Phenacaspis pinifoliae (Fitch), fig. 40. — 

 Scales of this species appear as white specks along the needles of 

 its favorite hosts, Austrian and Mugho pines, as well as other 

 kinds of pines and some spruces. The purple insect under each 

 shell sucks out sap and chlorophyll, reduces the vitality of the 

 needles, and causes shedding of needles. Reddish eggs, which 



