twelve] our rivals — the INSECTS 



into California, where it wrought astonishing 

 havoc. The young crawl for a while, and then 

 settle down in vast numbers, sucking the life out of 

 a tree. An orchard will be destroyed in a single 

 season, and the most beautiful neighborhood will 

 in a short time become a desert. It breeds on such 

 trees as walnuts and willows, and on your berry 

 plants, your lilacs, and most other shrubs, as well 

 as on all fruit trees. All scales poison the wood, 

 as well as suck the sap, which to some degree is 

 true also of aphides. Besides the remedies named, 

 we must bear in mind that a healthy tree is very 

 much less likely to be assailed than a sickly tree, 

 therefore keep up steady growth. 



Besides these almost domesticated enemies of 

 our peace, each year is pretty sure to develop some 

 special insect or worm, like the pear psylla, which 

 gave us so much trouble in 1903. Forest worms 

 are found to come in periods of about thirty years. 

 Different sorts of borers move across the country, 

 sometimes westward and sometimes eastward. 

 The remedies which I have named are, as a rule, 

 what we need for these special visitors, only attack 

 them promptly before they get good lodgment. 

 Prof. Roberts, of Cornell University, says the worm 



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