34 FRUIT-GROWING 



the Canadian line. Its name describes it, as the 

 individual scales are somewhat like an oyster- 

 shell in shape. It is a formidable pest and 

 where it once becomes well established it is far 

 more difficult to fight than its Chinese rival for 

 entomological attention. However, it is quite 

 conspicuous and should be readily detected on 

 young trees even by an inexperienced person. 



Apple trees as they come from the nursery 

 are seldom infested with boring insects. As a 

 rule borers attack only trees that have been 

 weakened, and a nursery tree that can be grown 

 to a salable size within one or two years is not 

 liable to be a favorable hunting-ground for any 

 of the insects that make their attack below the 

 surface. 



Various egg masses of moths are sometimes 

 found on the twigs, but these are usually so ob- 

 vious that they would attract the notice of any 

 one planting the trees. One should always be 

 on the watch for the egg masses of the gypsy 

 moth, however, and for the tenacious, cobweb- 

 like nests of the brown-tail moth. These last 

 are liable at any time to appear on nursery 

 stock from almost any part of the country as 

 there has been abundant opportunity for them 

 to have been introduced into the neighborhood 

 by nurseries in the last ten years. 



There are several diseases that may appear 

 on apple stock but it is difficult to name and 



