10 THE CABBAGE MAGGOT. 



all practical work on the part of the market gardeners is 

 most advantageously applied to the early crop of cauliflower 

 and cabbage, which suffers most from the attacks of the Fly. 

 This year almost all of the early crop of cauliflower in Minne- 

 sota was destroyed by this pest. A few fields within our 

 knowledge were spared, generally, be it said, where plants 

 were located in a field subject to some breeze, and where all 

 stalks of the preceding year's crop had been destroyed by 

 plowing the previous fall. 



The field work has been classified under two heads. Series 

 I representing work done between May 15th and June 7th, 

 that is, on the early crop; and Series II, tlie work on late 

 cauliflow^er, which, for the reasons given above, is not as 

 productive of results as work earlier in the season. 



We have abandoned entirely any attempt to use the tarred 

 paper disk method for reasons given in the last Annual Report. 

 We have also, in some instances, tried methods which have 

 been experimented with and reported upon in other places in 

 previous years, to note what results could be obtained here. 

 Other remedies or methods of prevention are original. 



We briefly tabulate experiments and results under Series I. 



Carbolic Emidsion : The stock solution is made by dis- 

 solving I lb. of hard soap in i gal. boiling water, adding i 

 pint crude carbolic acid, and churning immediately with a 

 force pump or syringe until thoroughly emulsified. 



On Radish: i part emulsion to 35 parts water applied on 

 radishes (sown May 14, up May 19) on May 22nd, and a 

 second application given May 28th. This crop was not 

 troubled by the maggot, both check rows and treated rows 

 making good showing. 



Ow CauURoivcr : a. Planted May 9th. Carbolic emulsion 

 I part, water 30 parts ; applications May 23rd and May 28th. 

 On May 30th these were found infested with worms, and 

 carbolic emulsion double strength (i to 15) was applied, 

 this being repeated June 5th. These last applications saved 

 the plants. This double strength solution did not prove suc- 

 cessful in every case, as is shown later. 



b. Six rows treated ( i to 30) May 19th, second applica- 

 tion May 23rd and June 3rd. On July 6th no marked dif- 



