THE PARSNIP LEAF-MINER. 13 
for the market. European writers on the celery leaf-miner state that 
dusting the affected leaves with a mixture of finely powdered soot and 
lime, three parts to one, has proved beneficial in preventing the flies 
from depositing their eggs upon the leaves. It is applied when the 
leafage is damp. Other similar deterrents, such as road dust, would 
have about the same effect. 
Sprays of kerosene emulsion and of carbolized kerosene emulsion 
have also been reported to be successful in the treatment of young 
plants affected by the celery leaf-miner. These, if applied at the 
proper time, would act as deterrents and might have some effect on 
the larvae at about the time when they are ready to transform to 
pupae and when the mines are thin. It is doubtful, however, if either 
of these fluids would penetrate the leaves to any great extent except 
at this time. 
