SCALE INSECTS OF IMPORTANCE 325 



The female insect as removed from under a scale is represented in fig. 

 10, and one of her yellowish progeay in fig. 11. 



Life history. The winter is passed by partly grown individuals 

 which become mature toward the last of June. This insect, like the per- 

 nicious scale, is ovoviviparous, that is, gives birth to hving young, which 

 begin to appear about the last of the month and continue to emerge for 

 several weeks. This species produces but one generation in this latitude, 

 and this restriction alone makes it much less dangerous than the preced- 

 ing form. 



Food plants. This insect appears to have a decided preference for 

 plum in New York state, since it is most frequently found on this 

 fruit tree. It has also been found on apple, pear, cherry, prune, currant, 

 purple-leaved plum, mountain ash, elm, linden, Carolina poplar and willow. 



Distribution. This insect has become established in widely sepa- 

 rated localities in America. It has been reported from the following states : 

 Ohio, Michigan, Iowa, Idaho, Kansas, and it has been received from 

 Pennsylvania. Dr Marlatt records its presence at several Ontario (Can.) 

 localities, and in British Columbia. 



This species is now widely distributed in the state, having been received 

 from Fredonia, Chautauqua co., Lewiston and Youngstown, Niagara co., 

 Brighton, Penfield and Rochester, Monroe co., Geneva and Stanley, 

 Ontario co., Williamson, Wayne co., near Kinderhook, Columbia cb. and 

 Millbrook, Dutchess co. It has been received by Dr Howard from 

 Trumansburg, Tompkins co.. Grooms, Saratoga co., Troy, Rensselaer co., 

 Fishkill, Dutchess co. and Blauvelt, Rockland co. 



Remedies. Methods of value against the pernicious or San Jose 

 scale should prove equally effective with this species, and as a rule it will 

 probably be found much easier to control. 



Bibliography 



The following records are confined almost entirely to the American history of 

 this species. 



Curtis, John. Gardener's chronicle. 1843. p. 830 (original de- 

 scription). 



Lintner, J. A. Injurious and other insects of the state ^i New York, 

 nth rep't, 1895. 1896. p. 271 (on apple). 



Marlatt, C. L. A dangerous European scale insect not hitherto 

 reported but already well established in this country. Science. July 7, 



