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JOURNAL OF EC0X0:MIC ENTOMOLOGY 



Mr. C. Gordon Hewitt: As Professor Titus has raised the ques- 

 tion of the flight of the house-fly, I should hke to give my own expe- 

 rience in the matter; as important results were pubRshed in a report 

 by the British Local Government Board, on the carriage of infection 

 by flies. Two or three years ago I had some experiments carried out 

 in the city of Ottawa to study the flight of flies under city conditions. 

 Flies were bred out and then marked T\4th rosalic acid. They were 

 liberated at a given point in a fairly well-inhabited region, throughout 

 which Tanglefoot papers were distributed in the houses. These Tan- 

 glefoot papers were collected from day to day. Out of the 13,500 

 flies that were liberated, 172 marked flies were recovered at varjdng 

 distances from the point of liberation, the farthestr being 700 j^ards. 

 In a further report of the British Local Government Board, experiments 

 carried out by Copeman, Howlett and Merriman in Norfolk, England, 

 demonstrated that under rural conditions flies travel from three hun- 

 dred to seventeen hundred yards from the refuse in which they are 

 bred; their flight dej^ending largely on the prevailing winds. Experi- 

 ments are recorded by Nuttall, Merriman and Hindle who carried on 

 experiments under urban conditions in Cambridge, England, which 

 bear out on the whole the limited range of flight of flies under city 

 conditions. I think those interested would do well to consult these 

 reports, which I think could be easily obtained. 



President H. T. Fernald: The next paper will be read by Glenn 

 W. Herrick. 



ADDITIONAL DATA CONCERNING THE CONTROL OF THE 

 FRUIT-TREE LEAF-ROLLER IN NEW YORK 



By Glenn W. Herrick 



During the past three years the fruit-tree leaf-roller, Archips 

 argyrospila, has been exceedingl}^ abundant in parts of New York 

 State and has caused serious losses to fruit-growers. In the spring 

 of 1912 an extensive series of experiments in an orchard in Genesee 

 County was conducted in an attempt to control the leaf-roller by 

 destroying the larvse with poison and contact sprays. In all, over 

 seventeen combinations of materials were tried on different groups of 

 trees in the orchard. Most of the applications were made before the 

 cluster of flower buds had separated. At this time, however, a large 

 part of the eggs had hatched and many larvse had already worked 

 their way down among the cluster buds and Avere feeding on the buds 

 and bud stems. 



The results of the whole series of experiments were really very dis- 

 couraging so far as prevention of injury to the fruit was concerned. 



