INSECTS AFFECTING PARK AND WOODLAND TREES 221 



L i r i o d e n d r o n t u 1 i p i f e r a Linn. S c i a d o p i t v s v e r t i c i 1 1 a t a Sieb. & 



'I'uliinree. Ziicc. I'mhrclla pine. 



L y c i u m h a 1 i ni i f o 1 i u m Mill. Matri- S h e |) li c r d i a sp. 



mony vine. S ni i 1 a x sj). 



Magnolia (all sjiecies). S o |i h o r a jajionica Linn. Japanese 



Myrica cerifera Linn. Wax mvrtlc. ])agoda tree. 



Nyssa sylvatica Marsii. Tii])elo, Staphylea sp. liladder nut. 



Pepperidge, Black gum, Sour gum. S t e |:i h a n a n d r a fie x u o s a Sieb. & 



Ostrya virgin ica AVild. Hornbeam, Zucc. 



Ironwood. Sty rax j a p o n i f; a Sieb. X: Zucc. 



Paulo w n i a i m p e r i a 1 i s Sieb. & Zucc. '1' a m a r i x sp. 



P h e 1 1 od e n d r o n sp. T a x o d i u m distichum Rich. Bald 



Philadelphus coronarius Linn. cypress. 



Mock orange, syringa. T a x u s sp. Vew, 



Pinus sp. Pine. T e c o m a radicans Jtiss. Trumpet 



P 1 a t a n u s o c c i d e n t a 1 i s Linn, .\mer- creejter. 



ican plane. Buttonwood. Tsuga canadensis Carr. Common 



Potentilla frnticosa Linn. hemlock. 



Q u e r c u s (ajl species). Oak. \' a c c i n i u m sp. 



Retinispora (all species). Japan Wistaria sp. 



cypress. X a n t h o c e r a s s o r b i f o 1 i a ISunge. 



R h a m n u s sp. But kthorn. X a n t h o x y 1 u m a m e r i c a n u m Mill. 



Rhododendron s]). Prickly ash. 



The above list shows a very wide range of food plants, and it will 

 undoubtedly prove of considerable value to parties setting- out trees in 

 sections where this pest occurs, since it may be possible in man}' instances, 

 to select species not liable to serious injury, a procedure which might 

 result in material saving in the course of a few years. It is also well to 

 call attention in tliis connection to the limited means of dispersal possessed 

 by this species, and on large estates in particular, it would probably be 

 advantageous to have the surrounding trees, so far as possiiile without 

 interfering with more important ])Ians, largely of species unfavorable 

 to the development of the scale. This would materially lessen the danger 

 of its being brought on the place, and the likelihootl that control work 

 would be marred by the indifference of adjacent landowners would be 

 much diminished. 



Means of dissemination. The method of spread is of considerable 

 importance, particular!)' in places where this scale has not become estab- 

 lished. It is conveyed long distances almost entirely by nursery stock and 

 there is very great danger in budding from infested stock, since this scale 

 insect has a marked tendency to gather about buds and other rough portions 



