64 



THE REPORT OF THE 



No. 19 



raspberry, wild black currant, wild grape, Virginia creeper, elder, red-osier 

 dogwood, mountain maple, black maple, silver maple, white ash, black ash, 

 beech, blue beech, ironwood, basswood, alder (Alnus incana), poplar (Popu- 

 lus alba), rock elm, American elm, prickly ash, butternut, black walnut, 

 catalpa, hazel-nut, pin-cherry, bur oak, English oak (Quercus rohur), sweet 

 hickory, and many species of herbs near infested trees. 



Remedies : 



(1) The lime sulphur spray. This must be very carefully put on as the 

 scales for the most part in fall, winter, and spring, are to be found on the 

 lower side of the branches. 



(2) Kerosene emulsion, applied when the tree is dormant, preferably 

 as soon as the leaves fall in autumn. Dilute the stock emulsion with four 

 parts of water. 



(3) Kerosene emulsion, flour kerosene, or whale-oil soap at ordinary 

 strength applied as soon as eggs have hatched, which must be determined 

 by actual observation each year. 



Fig. 24. Twig of plum infested with Lecanium or New York Plum .Scale, (a) The old 

 scale of the previous summer empty and lifeless; (b) the immature wintering 

 scales, which will become full grown like (a) next June. 



