52 INJURIOUS INSECTS OF I909 AND IQIO. 
cotton and carrying it away for nest-building, and it had to be con- 
tinually replaced, until finally tobacco was dusted on the cotton, 
after which the birds left it alone fairly well. This trial of cotton 
was hardly made with the expectation of its being practical for 
market gardeners, but in order to see whether or not it would act 
as a barrier in preventing the fly getting close enough to the plant 
to lay her eggs thereon. If it did we thought that some modifica- 
tion of this method, of real utility gardeners, might be denoted. 
One row of 27 cauliflower plants was set out, partly on May 
14th and partly on May 20th. It was treated with waxed paper 
and creosoted sawdust on June 2d. The paper was put around 
next to the plants, and the sawdust around that. The treatment 
injured the plants badly. 
Another row of 42 plants, set out on May 2oth, was treated 
similarly on June 2d, and on June 3d all planis were dead. Evi- 
dently creosoted sawdust cannot be used in any way for the cab- 
bage maggot. 
A row of 88 cauliflower plants was set out on June 3d, below 
the Dairy Hall. On the morning of June 4th every other plant in 
this row was treated with cotton, the cotton being wound around 
the stem of the plants and at the bottom pushed down in three or 
four places; the dirt being closed up to hold the cotton firmly down. 
On the morning of June 7th these plants were examined, and it 
was found that the cotton had been torn away by the sparrows for 
nest-building. This occurred several times, and the damage had to 
be repaired, and finally tobacco was used for keeping the birds away. 
On June 22d the plants in this experiment were pulled up, and the 
roots examined, with results as follows: 
Treated plants ....... 9 marked, 15 free. 
Check plants ....18 marked, 13 entirely free from infestation, 
—showing some advantage for the treatment. 
A row of 80 cauliflower plants, set out on June 3d, was also 
treated with cotton, as described in the experiment just discussed. 
This experiment was also bothered by the birds. These plants 
were also pulled up on June 22d and examined, with results as 
follows: 
AUREAIOL “so Gada be uleoar 10 marked, 25 free. 
CHECKS Peete erate 17 marked, 17 free. 
—this, too, showing some advantage in favor of the treatment. 
