38 



ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 47 



Juniper Webworm, Dichomeris marginella (F.), fig. 29. — 

 The larva of this species is a light brown caterpillar only about 

 one-half inch long. Several caterpillars web together and feed on 

 juniper foliage, causing it to turn brown and die. Development 

 of the caterpillars is completed in early summer. Pupation occurs 



Fig. 28. — Juniper scale: an infestation on juniper. Dark red, sapsucking 

 scale insects are under the gray or white shells on the surfaces of twigs. 



in the webbing and debris ; from each pupa a moth emerges. The 

 female deposits eggs on foliage to produce another brood of cat- 

 erpillars that pass through the winter. The caterpillars become 

 active again in the spring. 



Control Measure 3 (end of circular) as soon as the cater- 

 pillars are discovered. Spray should be applied forcefully. 



Juniper Bark Beetle, Phloeosinus dentatus Say. — Several 

 kinds of junipers are damaged by the adults of this species, dark 

 brown, tubular beetles, each about one-sixteenth inch long. Be- 

 ginning in early spring, the beetles feed in the crotches of small 



