EXPERIMENT STATION EEPORT. 553 



Ground tobacco, powdered white hellebore, carbolic aoid and 

 sealecide were furnished to all those that used these materials. We 

 eould get no one to try the paper disks. Complaints of injury and 

 offers to try experiments were receiived after thci insects began to 

 iijipear in the fields, but practically always so late that by the time 

 iil>plication could bo reccmimended and made they were too much 

 delayed to be effeotive'. 



Mr. Dickerson was assigned to arrange for and to watch the 

 experinjeuts, but as it was desired to make this largely a growers' 

 trial, all the applications were made by them and at times selected 

 by them excci>t as othenvise noted here. The results, while they 

 seem at first sight disappointing, were really not so when closely 

 studied, and they give material for practical recommendations 

 which will be made in a bulletin on the subject. It is desired here 

 to record only the experiments made to show the varying conditions 

 and results. 



Riverton Experiments. 



April 25th, Mr. Dickerson found that Mr. Taylor had set out 

 five rows of cabbage plants solely as subjects for this experiment. 

 < )ne row was to be used as a check, the others divided into one-half 

 rows were to be used in the experiments. The first application of 

 tobacco and hellebore was to be made on the 26th. 



May 21st, maggots were found in considerable numl>ers on both 

 treated and untreated rows, and at first sight the latter were no 

 better than the former, but on search many places were found in 

 the rows treated with carlwlic acid and kerosene emulsions which 

 showed maggot attack while the insects themselves were gone. 

 Xcither the tobacco nor the liellelwre liad, apparently, served as a 

 repellant. The sealecide had injured the plants and had not, 

 apparently, killed the insects. The carbolic acid emulsion had been 

 used at half stretigth only through an unfortunate misunderstand- 

 ing, not due to Mr. Taylt)r, and the test was not a fair one. The 

 difficulty seemed to^ l>e largely mechanical ; many of the maggots 

 were very low down on the roots, while others seemed to be covered 

 l)v an exudation that acted as a protection. 



June 8th, the larva? had very generally changed to the pu]~>al 

 stage and many of the flies had emerged, so that the experiments, 

 as 'against that brood, might be considered closed. All the plants 



