INSECTS AFFECTING OHIO SHADE TREES 181 



in a dying- condition. A weak kerosene emulsion was applied at the 

 time the first brood was emerging- and a very dilute solution of 

 whale oil soap at the time the smaller fall brood appeared. As a 

 result the trees were almost completely cleared of the pest, and 

 additional treatments have not been found necessary thus far. 

 However, the scale is again obtaining- a rather strong foothold and 

 will soon need attention. The insect is illustrated, natural size, in 

 Plate 3, Fig. 1. There is also shown in the illustration an adult of 

 the twice-stabded ladybird Chilocorus bivulnerus Muls., a natural 

 enemy of the scale which does considerable towards holding it in. 

 check. 



n ^ TJ /- 2: o 7 This scale was recorded at Men- 



The Golden Oak Scale, XT . 



Asterolccamum varwlosum Ratz. tor b ? Newe11 m 190 and was 



also received from Glendale in 



1907. An infested tree stood in a lawn adjoining Edgewater Park, 

 Cleveland, in 1906, and on it, July 19, the young were appearing in 

 immense quantities. The scale is easily determined on account of 

 a yellowish-green golden color and because it causes a slight ab- 

 normal growth upon the twig, thus presenting the appearance of 

 being partially imbedded in the bark. Although alive, the trees 

 infested were not healthy, the bark being very rough and uneven 

 and seemingly only partially able to fulfill its duties. 



Kerosene emulsion is an effective remedy when applied during 

 the hatching period. 



^ 7 r . j-. 7 . , , . , Though not a scale, this insect may 

 The Pine Bark Aphid. 



Chermeslinicorticis Fitch, Really be considered here, as it's ap- 



pearance is much the same as that of 



some of the scales and the control methods are similar. The adults 

 are illustrated in Plate 3, Fig. 3, where they may be seen as collected 

 in thick, white, floculent masses upon the base of the pines. The 

 pest has been noticed for the past two seasons upon certain trees in 

 the Experiment Station gardens, and the writer has observed it in 

 lesser quantities than those shown in the illustration upon pines in 

 the Cleveland parks. 



The foliage of the trees that are worst infested upon the Experi- 

 ment Station grounds is beginning to loose color, indicating the 

 vitality of the trees is becoming weakened. 



The pest is subject to the action of contact sprays, according 

 to Dr. E. B. Southwick, Entomologist of the New York parks, the 

 stiff sprays being effectual. 



