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MAR 2 1950 



Circular No. 828 



December 1949 • Washing 



UNITED STATES DEPARTMENT OF AGRICULTURE 



Scraping and Banding Apple Trees as a 



Supplementary Codling Moth Control 



Measure in the Pacific Northwest 



By M. A. Yotheks and F. W. Carlson, entomologists, Bureau of Entomology 

 and Plant Quarantine, Agricultural Research Administration a 



CONTENTS 



Page 

 Introduction 1 



Location of overwintering larvae. 2 

 Percentage of larvae removed by- 

 scraping 4 



Proportion of larvae caught in 



bands after leaving the fruit __ 4 



Larvae caught in trunk bands 



and limb bands 6 



Effect of density of infestation on 

 number of larvae caught in 

 limb bands and trunk bands__ 7 



Influence of apple variety on 



number of larvae caught 7 



Time required for beta-naphthol 



bands to kill 7 



Page 

 Sticky bands as compared with 



beta-naphthol bands 11 



Large-scale orchard tests of 



scraping and banding 11 



Experimental methods ,_■_ 11 



Description of plots 11 



Results of tests 13 



Methods of scraping and band- 

 ing 16 



Scraping - 16 



Banding 17 



Band removal 17 



Cost of scraping and banding 20 



Summary 21 



Literature cited 22 



INTRODUCTION 



Scraping and banding apple trees to trap the larvae of the codling 

 moth (Garpocapsa pomonella (L.)) have long been common supple- 

 mentary control practices. During the last century these practices 

 were followed very extensively, but with the advent of spraying they 

 fell more or less into disuse. However, in about 1927 difficulties 

 encountered with spray residues and the development of chemically 

 treated bands by Siegler et al. (10, 11, 12) 2 and by others gave re- 

 newed impetus to scraping and banding. 



The band developed by Siegler and other workers consists of cor- 

 rugated paper strips coated with beta-naphthol dissolved in a heavy 



1 Acknowledgment is made to E. J. Newcomer, in charge of the Yakima, Wash., 

 laboratory of the Bureau of Entomology and Plant Quarantine, where these 

 studies were made, for suggestions throughout the work, and to F. P. Dean, also, 

 of this laboratory, for assistance with the statistical analyses. 



2 Italic numbers in parentheses refer to literature cited, p. 22. 



842504—50 1 1 



