EXPERIMENT STATION BULLETINS. 



329 



in their passage through the pump), is not entirely satisfactory as yet, the emul- 

 sion is safer and very much more uniform. The use of the mixture has not yet 

 passed out of the experimental stage. 



Any scale that is suspected of being the San Jose scale, should be sent to the 

 entomologist for identification. If it is really the San Jose scale, the owner should 

 know it immediately, and if it is comparatively harmless, the knowledge that it 

 is so, will save a good deal of worry. 



The English Walnut Scale. (Aspidiotus juglans-regice.) 



Although this pest undoubtedly works on English-walnut it is of far more im- 

 portance to us in Michigan because of its love for peach, plum and other trees. 

 The description of the European fruit scale will apply fairly well to this pest. 

 It is usually somewhat larger than the latter, but in general the scales look much 

 alike. This pest may be classed as somewhat less dangerous than the fruit scale. 

 The same remedies as those recommended for the San Jose scale will apply in 

 this case. 



The Peach Lecanium. (Lecanium nigrofasciatum.) 



For many years, the peach Lecanium has flourished, especially to the south of 

 us. It is a small Lecanium, about an eighth of an inch long and one-sixteenth of 



Fig. 52. — ^Peach Scale, Author's illustration. 



an inch broad. The scale is reddish-brown and oval. The top of the scale is 

 lighter in color than the sides, and there are about twelve radiating lines on each, 

 side dividing the border into dark areas; see Fig. 52. When just acquiring full 

 size, the colors are very bright, brown and black with flaming red. 



These scales cluster on the twigs of peach, soft maple and a number of other 

 trees and shrubs, frequently doing a great deal of injury. 



REMEDIES. 



The usual winter sprays, applied for the San Jose scale, or a spray of kerosene- 

 emulsion, diluted about eight times, during late June or early July, when the 

 eggs hatch. 



The Fruit Bark-beetle. (Scolytus rugulosus.) 



The fruit bark-beetle is a small beetle which works between the bark and wood 

 of peach, apple, pear and cherry. The first intimation of the presence of this 

 pest usually comes when the owner discovers that some trees have many small 

 round holes in the bark, appearing very much as if a light charge of fine bird 

 shot had been fired into the trees. If the outer bark be carefully pared down, 

 in such a case, the tunnels from which the holes spring will appear. First there 

 ■will be a short and broad brood-chamber with an opening to the surface at one 

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