XkW YoKK AORfCULTUKAL E^XPKRIMENT STATION. 4ol 



Houc (lUiuWiou, diliitw] with from fonr to Hix parts of water, coold 

 b{- (lepeiided upon to kill the hibernating scaler when applied to 

 the infested trees in the form of a spray. When the spray is to 

 be directed against the newly hatched lice, the emulsion should 

 not be dilutee] with more than nine parts of water. 



The Oak .Scale. 

 AHterodioHpiK fju/;rcif:oUi Bouch'?. 



There are but few references to this insect in the writings of 

 American entomologists. In his report for 1880, p. 3.30, Prof. 

 J. H. Ojmstock, who was then Entomologist of the United States 

 Department of Agriculture, published a descripition of the male 

 and female, the former being taken from Signoret. Another ref- 

 erence is in Insect Life, Vol. II, p. 41, in which Dr. L. O. Howard 

 states that this scale is found almost solely upon American oaks 

 in a grove in the Department grounds, previously referred to by 

 Professor Comstock in his report for 1880. In Insect Life, Vol. 

 VII, p. 120, Mr. 0. L. Marlatt gives the result of experiments 

 against thift insect. He found that the newly hatched yoang 

 could be killed by spraying the infested trees with kerosene emul- 

 sion, one part to thirteen parts of water. In the same volume, 

 page 428, a brief reference is made to a note by Mr. E. Newstead 

 in the Entomologist's Monthly Magazine for April, 1895, in which 

 he states that, although birds are not usually sui>i>osed to feed on 

 scale insects, he had found that the blue tit and longtailed tit 

 feed on thifi and certain other sj^ecies. 



It is probable that, except in isolated cases, the species has 

 never been a serious pf:rst in this country. 



As its name implies, this scale attacks the oak. >Some idea of 

 its general apiK^arance can be had by referring to Plate XIX, 

 fig. 6. This figure is from a photograph of an infested twig, 

 natural size. The female scales are nearly circular and somewhat 

 conical. They are dark or yellowish green in color. "WTien one of 

 the mature scales is removed, it will be found to have made a pit- 

 like depression in tlip bark. The mature female scales will meas- 

 iirf from 1 mm. to nf^arh 2 mm. in difun^'tpr. According Vj 8ig- 



