sufficiently to show a green (or white, in the case of the 

 blossom buds) color, as the spray is so strong that injury 

 may then result. 



Many orchardists are now spraying, one winter with the 

 lime-sulfur wash, and the following winter with one of the 

 miscible oils, believing that by an alternation of the two ma- 

 terials better results are obtained. Whatever the material 

 used may be, the spraying should be thorough, and every part 

 of the tree covered with the spray. If windy weather pre- 

 vents good work, it is often possible to S23ray one side of the 

 trees and complete the treatment at some later time. 



Sometimes summer treatments seem advisable on trees 

 badly affected. In such cases either of the above materials 

 can be made use of, though they should be diluted much 

 more than for winter use. 



Many other trees besides fruit trees and many shrubs are 

 attacked by the San Jose scale, but the treatment for these 

 is the same as that ffiven above. 



fc)^ 



The Oystee-shell Scale. 



This common jDest on apple, pear, ash, poplar and willow 

 trees and lilac bushes is much larger than the San Jose scale, 

 and is of different form, being long, rather pointed at one end 

 and broader and rounded at the other, and mav be curved 

 along its length, the form as a whole suggesting that of an 

 oyster shell, which has given it its name. It is brown or 

 dull gray in color, this last shade being most common on the 

 ash, willow and lilac. 



The life history of this scale is so different from that 

 of the San Jose scale that the treatment for it is also very 

 different. 



The winter is passed by this insect in the egg. At this 

 time the parent insect which produced the scale lies dead 

 under the pointed end of the scale, and the rest of the space 

 is occupied by from twenty to a hundred tiny whitish eggs. 

 These hatch about the first of June, and the young, which 

 are whitish-yellow, and closely resemble the young of the 

 San Jose scale, push out from beneath the parent scale and 

 crawl about, seeking for a place to settle and feed. When 



