240 STATE BOARD OF AGRICULTURE. 



Fig. 8. — Large Peach Lecanium. Antenna and derm showing pores. Greatly enlarged. Original. 



REMEDIES. 



There is every reason to suppose that treatment similar to that used against the New 

 York plum scale will be effective against this one. Winter sprays of kerosene emulsion 

 being probably the best and cheapest. 



THE ENGLISH-WALNUT SCALE ON PEACH AND MAPLE. 



(Aspidiotus juglans-regice Comst.) 



Examination of the large amount of scale-insect material collected and sent in during 

 the past few years, has resulted in bringing to light another scale, closely related to the 

 European fruit-scale {Aspidiotus ostreaeformis) and to the San Jose scale. It is 

 the English-walnut scale, a pest unfortunately not confined to the walnut for food, but 

 possessing a host-list covering quite a range of fruit and shade trees. 



The first sample brought to light was on a peach tree, which was well incrusted with 

 the scales and withal, having a sickly appearance. As this species was not at that time 

 sufficiently familiar to the writer for certain identification, is was sent to Dr. Howard, 

 Entomologist of the Department of Agriculture at Washington, D. O, and through his 

 kindness Mr. Kotinsky examined the material and subsequently another lot on maple 

 and mountain ash. Later this species was found on plum, doing serious injury. In 

 appearance this scale resembles the European fruit-scale, especially when seen in num- 

 bers, although the writer never has seen them so numerous as the fruit-scales. The 

 individual scales also resemble those of the fruit-scales. The female scales are rounded, 

 brownish-grey in color, and flat, while the male scales are smaller, elongate and darker. 

 When numerous, they often are covered with a sooty growth of fungus which subsists 

 on the honey-dew secreted by the insects. 



From an economic standpoint they are of first importance in Michigan, working as 

 they do on peach and plum. Happily the infestations in the State, known to the writer 

 do not number half a dozen, and these are partly on large shade trees, none of them 

 being in nurseries. 



The pest was first found by Professor J. H. Comstock at Los Angeles, in California, 

 on the bark of English-walnut, in 1S80 or earlier. Professor Comstock also found it 

 on locust, pear and cherry. To this list may now be added black cherry, plum, Japan 

 plum, apricot, sweet-gum, peach, soft maple, and mountain ash. The infestations in 

 Michigan are confined thus far to peach, mountain ash, soft maple and plum. The 

 English -walnut scale stands about on a par with the fruit-scale from an economic stand- 

 point. The damage from its attacks has not as yet been as serious as that done by the 



