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INSECTS AFFECTING SHADE TREES 



The gipsy moth is particularly dangerous to oaks, willows, 

 and apples. It is a noteworthy fact that the young caterpillars 

 will not attack cedars, pines, and hemlocks. While young they 



1 



FIG. 298. Young brown-tail moth caterpillars emerging from winter web and feeding on 

 the dead leaves composing its surface. (After Sanderson.) 



have to find deciduous woods. If, therefore, all such are removed 

 from the vicinity of pines, the latter will be protected. Marked 

 progress in combating the gipsy moth is being made along the 

 line of imported parasites. 



QUESTIONS 



1. Give life history, habits, and methods of control of the box elder bug. 



2. Do the same with the bronze birch borer. 



3. What is the so-called alder "blight"? 



4. Mention some galls of shade trees made by insects, and describe those 



with which you are familiar. What insect-made galls have you observed 

 on shrubs or other plants? 



5. Describe the two willow saw-flies and their larvse. 



6. Give briefly the life history of the white pine weevil. 



7. Describe the pine bark aphid. 



8. Give life history of the oak pruner. 



9. Give description and habits of the mourning-cloak and its larvae. 



10. Give description, life history, habits, and methods of control for the 



cottony maple scale. 



11. Which of the above pests are numerous and destructive in your locality? 



12. Describe the work of the gipsy and brown-tailed moths. 



