64 Report of State Board of Horticulture. 



SOME APPLE TREE PESTS. 



By A. B. CORDLEY. 



It was my intention when asked to prepare an article on 

 fruit pests for this report to make the account as complete as 

 possible with the data available, but only a brief outline of 

 the proposed report was necessary to show that neither the 

 time to prepare it, nor the space for its publication, was avail- 

 able at this time. I have therefore concluded to restrict my- 

 self to a comparatively small but, perhaps, the m.ost important 

 part of the subject, viz.: the four principal pests of the apple. 

 I have the more readily come to this conclusion by reason of 

 the greatly increased interest in apple growing in the various 

 parts of the State, and by the fact that during the past few 

 years I have published bulletins or reports upon these pests,, 

 the editions of all of which have been completely exhausted, 

 indicating an active interest in the subject. 



Many pests attack the apple — insect pests, fungus diseases, 

 bacterial diseases, etc. — but in this State at present there are 

 but four which stand out from all the others as of first im- 

 portance. These are the codling moth, the San Jose scale,, 

 apple tree anthracnose, and apple scab. 



One fungus, apple tree anthracnose, and one insect, the 

 San Jose scale, are destructive to the tree itself; while the 

 other insect, the codling moth, and the fungus, apple scab, to 

 a greater or less extent ruin the crop. 



THE CODLING MOTH. 



It is undoubtedly true that there are small apple growing 

 sections scattered here and there throughout the entire 

 Pacific Northwest that are still free, or practically free, from 

 the codling moth. But does this necessarily imply that they 

 are to remain free? Does it necessarily imply that the cli- 

 matic or other natural conditions are such that the moth 

 can not thrive there? May not the present immunity be ac- 



