126 THE APPLE \.E.\V HOPPER 



These results of Webster's are at variance with our personal work 

 of 1906, when, in an experiment with bran, Paris green and glue, no injur}- 

 from Cabbage Maggot was evident, tliough these were late plants raised 

 at a time when the maggot was not as destructive as earlier in the season. 

 From the work cited, and from Webster's work, it is evident that the 

 Paris green in tlie compound injures the plants. 



EXPERIMENT No. 14— CARBOLIC ACID AND LIME. 



This has been used successfully in New Jersey by Prof. J. B. Smith 

 and was gi\-cn a trial in Minnesota in 1907. 



The material is prepared as follows: The lime is slaked to a thin 

 cream; three pints of this cream to a gallon of water, to which is added a 

 tablespoon of crude carbolic acid. This mixture was applied around the 

 base of cauliflower plants from the time the plants w-ere set until the tlies 

 of the second brood began to appear. An ordinary garden sprinkling can 

 was used in applying this mixture, and about three ounces were used to 

 each plant. The lime forms a tiiin crust around the stalk of the plant when 

 it hardens, so that the maggots will not easilj' penetrate into the root. The 

 theory is similar to that of the tarred felt cards, that the carbolic acid and 

 lime mixture acts as a repellent. 



Two different plants were treated with carbolic acid and lime — one on 

 the Station grounds, and the other at Dahners' truck garden. Both plats 

 were gi\en eight treatments — the first three treatments made at intervals 

 of five tlays. and the remainder at intervals of a week. 



l-'ifty cauiitlower plants on plat on the Station grounds were treated 

 at these given intervals. .Alternate rows w^ere left untreated for checks. 

 Plant'^ were set May 17th. 1907. and the first treatment was made the 18th 

 of )ilay. The la^t treatment was made July 5th, and final counts were 

 taken July the 26th. At that time the treated rows contained 17 heads, 18 

 plants without heads, and 15 plants missing. The check rows contained 14 

 heads, 19 plants without heads and 17 plants missing. 



The cauliflower plants at Dahners' truck garden were set .May 2,3rd. 

 and given the first tre;itnient witli this mixture May 28th. Eight rows of 

 37 plants eacli were treated, and ten rows at one '^ide of these left as checks. 

 The treatments were made at the same inter\als as in the preceding experi- 

 inents. and the last treatment was made July 5th. Counts made on these 

 plants the Sth of August were as follows: 



Plants 

 Heads Without 



Plants 

 Dead 



Heads 



Treated (8 row.s) 215 il 40 



Check (10 rows) 266 62 42 



Raising these figures to the same basis for comparison, that is. on the 



basis of ten rows, the following figures are secured: 



Plants 

 Dead 



Plant.s 



Heads Without 

 Heads 



Treated, rows 270 50 50 



Check, rows 266 62 42 



The figures for both the check rows and the treated rows show prac- 

 tically the same results. The conclusion, then, frcnn these figures, would 

 be that the carbolic acid and lime treatment was not effectual. 



