60 



THE WHITE I'INE. 



secretion, beneath which covering are concealed myriads of minute lice. Schizoneura pinicola 

 Thos., feeds on the tender shoots of young White Piiie. 



Kerosene emulsion applied as a spray is the appropriate remedy for these plant-lice. 



LEAF -FEEDING INSECTS. 



The most destructive insects of the foliage of pine are several species of sawflies of the genera 

 Lophyrus and Lyda, one of which is represented iu its several stages at fig. 13. It is called 



FIG. 13. Lophyrut abbotii : 1 female, enlarged ; 2, 3, 

 pupa, enlarged; 4, 4, lame, natural size; 5, cocoon, 

 natural size; 6, male antenna, 7, female antenna, enlarged 

 (from Elley). 



Flo. 14 Tubes of pine leaves made by pine tube-builder natural size 

 (from Packard). 



Abbot's white-pine sawfly (Lophyrus abbotii Leach.), and is perhaps the most injurious foliage 

 feeder which infests the pine woods of the North. 



The caterpillar of a single species of butterfly, Thecla niphon Hbn., is known to feed upon the 

 foliage of White Pine, but among the larvae of moths of different families are innumerable piue- 



Kic;. 15,ChioTMipii pm\foli<r: 2, ncales on White Pine, leaves stunted ; 2a, same leaves not stunted by insects ; 26, 2c. female scale ; 2d, male 

 scale 2 and 2o natural size, 26 and 2c much enlarged (from Comstock Ann., Kept. Dept. Agr., 1880). 



feeding species. Prominent among them is the magnificent sulphur-yellow imperial moth (Eacles 

 imperialist l)ru.), whose larva attacks the leaves of various forest trees. Of other moths whose 

 caterpillars devour the foliage of White Pine may be mentioned : Harris's pine hawk moth (Ellemti 

 harrisii Clem.), E. coniferarum S. and A., E. pinoim Lint., Tolype laricis Fitch, the white-pine 

 tufted caterpillar (Platycemra furcilla Pack.), the redhead inchworm (Semiot J .isa bisignata Walk.), 



