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JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 14 



and the data were taken on the picked fruit only by the entomologist in 

 cooperation with the acting horticulturist and the plant pathologist. 

 No checks were left in this set of experiments. 



In 1920 a plan of further testing the relative efficiency of the sulfo- 

 arsenical dusts and liquid sprays was prepared in conference with Mr. 

 P. J. Parrott, Mr. C. R. Crosby, Dr. W. E. Britton, Mr. H. E. Hodgkiss, 

 Mr. S. W. Frost and the writer. It was proposed that tests according 

 to this plan should be placed in Connecticut, New York, Pennsylvania 

 and New Jersey. The Entomologist enlisted the cooperation of the 

 Acting Horticulturist and the Plant Pathologist of the New Jersey 

 Station. The apple blocks were located near Moorestown. The appli- 

 cations were made by the Acting Horticulturist and the Entomologist. 

 The data were taken by the Plant Pathologist and the Entomologist. 

 The following table will serve to set forth the results obtained from the 

 1913, 1914, 1919 and 1920 experiments. 



Examination of this table shows that in the 1913 tests no data on 

 either curculio or codling m.oth were obtained because there was not 

 enough of either insect to give results. In 1914 the curculio was not 

 sufficiently abundant to give data and the codling moth on the untreated 

 trees attack only 4.7 percent, of the total fruit. 



In 1919, however, there was an a.bundance of both codling m.oth and 

 curculio and in 1920 the curculio was present in large numbers and the 

 codling moth in fair numbers. 



Examination of the data, as set forth in this table indicates at once 

 that the control of codling moth and curculio obtained by the use of the 

 sulfo-arsenical dusts could not compare with the results obtained by the 

 liquid sprays. 



In view of the fact that Professor Whetzel, in his address to the New 

 York State Horticultural Society at Rochester last year, presented large 

 accumulations of data from Nova Scotia, New York, Michigan and 

 Illinois in which he showed that the control of codling m.oth obtained by 



