CHAPTER IV 



THE INSECTS, DISEASES, AND INJURIES OF 

 ORNAMENTAL CONIFERS 



A CONNECTED discussion of the insects, diseases, and 

 main injuries to which ornamental conifers are subject, 

 is here brought together in this country for the first 

 time. With the exception of the white pine bhster-rust (page 

 154), none of these pests is likely to be greatly destructive 

 over large areas, although the white pine weevil (page 127) 

 is a serious menace and a more adhesive paint-like spray is 

 apparently needed for it. The grower of conifers, however, 

 must always be on the lookout for insect and pathological 

 depredations; and those that seem to differ from the ones here 

 described or which are doing extensive damage should be 

 promptly reported (with specimens) to the experiment 

 station of the State or to the United States Department of 

 Agriculture. 



This chapter is in two main parts — the insects (page 124), 

 and the diseases and injuries (page 138). These parts are 

 prepared by specialists directly for this book, the former by 

 C. R. Crosby, Extension Professor of Entomology, and J. B. 

 Palmer, Instructor, Cornell University, the latter by F. Dick- 

 son, Instructor in Plant Pathology, Cornell University. 



The second part, on diseases and injuries, is divided into 

 four coordinate parts: 



1. Coniferous seedling diseases and injuries, page 140. 



2. Diseases and injuries of older coniferous trees, page 144. 



3. Tree surgery, page 161. 



4. Fungicides, page 165. 



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