U. S. D. A., B. E. Bui. 115, Part II. D. F. I. I., November i, n»12. 



PAPERS ON DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



THE ONE-SPRAY METHOD IN THE CONTROL OF THE CODLING 

 MOTH AND THE PLUM CURCULIO. 



(Second Report.) 



By 



A. L. Quaintance, In Charge of Deciduous Fruit Insect Investigations, 



and 

 E. W. Scott, Entomological Assistant. 



INTRODUCTION. 



The present paper constitutes the second report on the "one- 

 spray" method in the control of the codling moth in comparison 

 with the usual demonstration treatment of from three to five appli- 

 cations according to locality. The previous report on this subject 

 will be found in Bulletin 80, Part VII (Revised), pages 113 to 146 

 (1911) of the Bureau of Entomology. The experiments herewith 

 reported are in continuation of those detailed in the publication 

 cited, and have been done in connection with other experimental 

 work at several of the bureau's field stations. In addition to the 

 insect questions investigated hi a given locality, attention has also 

 been given to the control of certain diseases of the apple, this latter 

 in cooperation with Mr. W. M. Scott, then of the Bureau of Plant 

 Industry of this department. These tests have been made, as in 

 the work previously reported, in widely separated States, repre- 

 senting a considerable range in climatic and other conditions, and 

 were carried out as closely as possible according to a uniform plan, 

 for the most part by different members of the force engaged in 

 Deciduous Fruit Insect Investigations. The experiments in Virginia 

 in 1910 were carried out by Messrs. J. W. Roberts and Leslie Pierce 

 of the Bureau of Plant Industry and Messrs J. F. Zimmer and J. B. 

 Gill of the Bureau of Entomology. The work in Michigan during 

 1911 was under the immediate direction of Mr. E. W. Scott, and in 

 Delaware was done by Messrs. W. B. Wood and F. L. Simanton of 

 the Bureau of Entomology and Mr. W. B. Middleton of the Bureau of 

 Plant Industry. In Kansas, in 1911, the work was carried out by 

 Mr. J. B. Gill of the Bureau of Entomology and Mr. Leslie Pierce 

 of the Bureau of Plant Industry. 



Since the appearance of the first report of the Bureau of Ento- 

 mology on the one-spray method, additional information on the sub- 



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