66 



ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 47 



Fig. 46. — Sycamore lace bug: adults. The bugs, which are black and 

 have almost transparent wings, are shown congregated on the bark of a 

 tree. They have sucking mouthparts and feed on the under sides of leaves. 

 (Photograph from Connecticut Agricultural Experiment Station.) 



ter, are ineffective. The worm infestation can be reduced by 

 picking and burning the overwintering bags. 



Borers. — Newly set sycamores, like most other newly set 

 trees, are subject to attack by borers, especially the flatheaded 

 apple tree borer, fig. 34. Control Measure U (end of circular) . 



TULIPTREE 



Tuliptree Scale, Tourney ella liriodendri (Gmel.). — Oval, 

 brown females of this species may be seen plastered on the bark 

 of lower branches and twigs of the tuliptree in summer. Great 

 quantities of honeydew drip from the scales. Inconspicuous over- 

 wintering nymphs, also plastered on the bark, grow rapidly in 

 the spring and early summer. The female reaches maturity in 

 August and apparently gives birth to living young. 



Control Measure 5 (end of circular) in late winter. 



Tuliptree Aphid, Macrosiphum liriodendri (Monell). — This 

 small, greenish aphid occurs in great numbers on the under 

 sides of the leaves of the tuliptree. Honeydew, which is secreted 



