29'8 KiEPORT OF THE DEPARTMENT OF ENTOMOLOGY OF THE 



INTRODUCTION. 



The past three years have demonstrated that the San Jos^ scale 

 will thrive in soane of the best nursery and fruit-growing sections 

 of the State. This fact, together with its \V-ell-known destructive 

 powers, makes it an important factor in the business of New 

 York nurserymen and fruit-growers. There is, therefore, much 

 demand for information concerning this important ispecies. With 

 a view to meeting the requirements of the situation, extensive 

 series of investigations have been planned bearing upon its devel- 

 opment, distribution and control. The present bulletin deals 

 principally with the development of females of the late broods. 



The investigations aim to present an exhaustive study of the 

 subject and much pains is being taken to work out each phase in 

 detail, as it is believed that only by such thorough work can the 

 true nature of this as well as other species be fully understood. 

 Such investir-^ions should form the basis for practical experi- 

 ments haviL. .1 view the control of such pests. 



As the work was not actively begun until last fall the results 

 thus far obtained are necessarily somewhat fragmentary. Fur- 

 ther investigations along the same and similar lines are being 

 carried on. 



PERIODS OF DEVELOPMENT. 



The CoccidcE present a marked difference in the development of 

 the male and female. The stages preliminary to the mature form 

 are well marked in the former, while in the latter they are not. 

 After the female larva settles down there is a uniform develop- 

 ment with little change except in size. There are, however, at 

 least three well defined periods through which both forms pass, 

 as follows: The period of activity, the period of growth and the 

 period of reproduction.^ The sexes were found to be practically 

 indistiuguishable in the early stages, there being no definite rela- 



^With the male the period of reproduction is also a period of activity as 

 it flies readily. 



