TREATMENT OF CABBAGE PLANTS, ETC. 835 



The plants were all cultivated and hoed about every ten days, 

 and an application of commercial fertilizer with the addition of 

 nitrate of soda was made at the time of each hoeing. 



Branford Experiments. 



In the raspberry field of A. E. Plant & Son, Branford, cabbage 

 plants were set between the rows of berries during April, with- 

 out treatment. The field was on a side hill sloping to the south 

 and west. The rows used in the experiments were on the upper 

 side, and extended north and south. The soil was rather heavy 

 except at the north end of the rows. 



On May 12th treatment was given as follows: 



Rows I and 2 were left as checks, no treatment. 



Rows 3 and 4, containing ninety-nine and one hundred and 

 ten plants respectively, were supplied with tarred paper disks. 



Row S, check, no treatment. 



Row 6, ninety-one plants. Row 7, ninety- four plants, and Row 

 8, ninety-nine plants, were treated with carbon disulphide applied 

 through an oil can in a hole an inch from the plant and one and 

 one-half inches deep. After the material was introduced into the 

 hole, it was covered with soil by the foot. One pound of the 

 liquid was used for the three rows. 



The plants were examined on June 5th. and only two plants 

 infested with the maggot were found, one in a check row and 

 the other in a row treated with carbon disulphide. 



Value of Tarred Paper Disks. 



Tarred paper disks and a tool for cutting them were first 

 devised by Professor E. S. Gofif of Wisconsin, and have since 

 been used by Slingerland and others. They prevent (mechanic- 

 ally) the flies from laying their eggs at the base of the stem, and 

 where made of tarred paper it is possible that the odor may have 

 a repellent effect, though this is not certain. 



In our tests these disks have given the best results of any form 

 of treatment, and similar results have been obtained by other 

 entomologists. It is important that they be applied before the 

 eggs are laid, otherwise they are ineffective. Plants which have 

 become badly injured by the maggot should be destroyed, those 



