338 



STATE BOARD OF AGRICULTURE. 



of a microscope, the cast skins of the eccentric scales being to one side of the 

 center while the cast skins are nearer the center in the case of the fruit scale and 

 the English Walnut scale. The European fruit scale produces several broods 

 of young in a year and the young are born alive. They multiply quite rapidly, 

 but seldom produce the crust on the bark which is to be found with the San Jose 

 scale. They seem to prefer plum to all other trees, but w'ork also on apple, pear, 

 currant, cherry, silver maple and a number of other trees and plants. They do 

 not work so disastrously as does the San Jose scale but often kill their host 

 plants, especially if they be plums or currants. Fortunately this pest does not 

 attack the peach. 



Fig. 62. — European Fruit Scale on plum. Author's illustration. 



REMEDIES. 



The same remedies that are recommended against the San Jose scale will 

 prove effective here. For a more extended account of this pest see Bui. No. 180 

 of this station. 



The Apricot Scale on Plum. {Lecanitim armeniacum.) 



Occasional outbreaks of this scale have occurred in Michigan. Unlike the San 

 .Tose scale and its allies, the apricot scale is large, and soft until full grown, 

 the full sized females measuring from one-eighth to three-sixteenth of an inch 

 in length. The eggs are laid inside the skin or shell of the mother. They hatch 

 during late June or July. At first the young lice wander about but after a time 

 they settle on the under sides of the leaves, remaining until late August, when 

 the^ migrate to the twigs, settle down, and thereafter move but little. The males, 

 like the males of other scale insects, are winged. Each develops under a waxen 

 skin of oblong form. Fig. 63 shows a number of females enlarged four and a 

 half times. They are yellowish brown in color, marked with black, and are 

 covered with a powdery material which resembles the bloom of some fruits. They 

 are soft until full grown, after which the skin becomes a hardened shell of horny 



