358 BOAED OF AGRICULTURE. [Pub. Doc. 



mature and begin to produce young, " averaging ten a day 

 for more than a month." Each of these young develops as 

 just described for the parent, and those produced first have 

 begun to produce young in their turn before their parent 

 has completed the same process. 



As a result, young, crawling forms may be found at almost 

 all times from the last of June until frosts appear in the fall, 

 during which time it has been calculated that the progeny 

 of a single female may number 1,608,040,200, all of which 

 have obtained their nourishment from the plant they are on. 

 With a power of increase as rapid as this, it is not strange 

 that trees suffer severely and often die in a short time after 

 being attacked by this pest. 



Food Plants. 



The San Jose scale feeds upon nearly all our plants, 

 shrubs and trees, except evergreens. Its more usual food 

 plants, however, appear to be the pear, peach, plum, cherry, 

 strawberry, raspberry, blackberry, gooseberry, currant, 

 grape, rose, osage orange, elm, maple, chestnut, oak, birch, 

 willow and Japanese plants. It attacks trunk, branches, 

 twigs, leaves, and even the fruit ; and during the year 1900, 

 currants, pears and apples, grown in Massachusetts, were 

 received so covered by these insects as to render them un- 

 salable. 



D ist ribut io n in J la ssa ch 1 ( setts . 



This scale was first discovered in Massachusetts in 1895. 

 Since that time it has appeared in a large number of places 

 in the State, probably introduced on stock purchased from 

 infested nurseries, and it is now known to occur in the fol- 

 lowing places : Amherst, Attleborough Falls, Auburndale, 

 Bedford, Belchertown, Beverly, Billerica, Boston, Brook- 

 line, Danvers, Dighton, Dracut, Everett, Greenwood, Grove- 

 land, Holyoke, Jamaica Plain, Leominster, Lunenburg, 

 Maiden, Middleborough, Millville, Natick, Xewtonville, 

 North Abington, North Attleborough, North Cambridge, 

 Norwood Central, Reading, Revere, Roslindale, Russell, 

 Salem, Saxonville, Scituate, Somerville, South Framing- 

 ham, South Chelmsford, Swampscott, Taunton, Three Rivers, 



