COOPERATIVE TESTING OF INSECTICIDES. 13 



(d) That if it appears probable that the material is of some value as an 

 insecticide, samples he sent by the standing committee to several entomologists 

 in different sections of the country, who may signify their willingness to do this 

 work, for the purpose of making cooperative tests of it. 



(e) That a plan of testing he worked out by the standing committee and sent 

 by it to each entomologist, with the substance, together with a plan for reporting 

 results, so that the factors entering into the test and the data in the reports 

 may he uniform and full. 



(/*) That reports received he compiled and a general report made by the 

 standing committee to this association at its annual meeting. 



{g) That these reports, or such portions of them as seem advisable, be pub- 

 lished hy the association and then hy others who may wish to publish them. 



III. Your committee further recommends that if the above plan or any 

 modification of it he adopted, the committee designated by this association to 

 carry it out he requested to prepare the plans for testing and reporting on the 

 tests and for assigning the materials to the entomologists selected by them to 

 make the tests. 



Respectfully submitted. 



H. T. FEBNALD, Chairman. 

 A. F. Bubgess. 

 H. A. Surface. 



On motion this report was accepted and ordered published in the 

 proceedings of the meeting. The appointment of the standing com- 

 mittee suggested was deferred for later consideration. A brief re- 

 port of the programme committee was made by the secretary and 

 related chiefly to the arrangement of the papers to be presented. 

 A motion was made and carried that the time for the presentation 

 of each paper be limited to ten minutes. 



A paper was then read by Mr. Washburn, entitled : 



INSECT NOTES FROM MINNESOTA FOR 1906. 

 By F. L. Washburn, St. Anthony Park, Minn. 



THE CABBAGE MAGGOT. 



Flies of the cabbage maggot (Phorbia brassiccB Bouche) were first 

 observed May 9. On May 16 eix<x laying was well under way. On 

 May 31 first maggots were observed. On June 5 maggots were ex- 

 ceedingly abundant. By June 12 puparia were found in Large num- 

 bers, and all the cauliflower of many market gardeners was reported 

 destroyed. By July 7 maggots were transformed to pupa?. Septem- 

 ber 26 was the latest date at which Hie- emerged from puparia in the 

 laboratory. 



On July 2 several cabbage maggot (lies which had been confined 

 under a bell jar with a potted cauliflower plant laid fertilized eggs, 

 which hatched on July C>, a few hours over three days from the time 

 of laying. The eggs were laid on the soil near the plant. The same 

 observation was repeated with other specimen-, the flies in the latter 



