io8 INSECTS OF ECONOMIC IMPORTANCE 



blotched with rusty patches. The maggots also 

 tunnel through roots of carrots. The parent insect 

 is a small fly only about i-6 of an inch in length. 



Control — Late sowing and rotation of crops; 

 celery should not follow carrots; clean cultivation 

 and destruction of all remnants and refuse after 

 crop is harvested. 



OTHER INSECTS INJURIOUS TO CELERY 



Celery leaf-tyer (PJiIycfcrnia ferrugalis). 

 Wire worms (several species). 

 Tarnished plant-bug (Lygiis pratensis). 



Carrot and parsnip pests 



Celery caterpillar (Papilio polyxenes). 

 Parsnip leaf-miner (Acidia frafria). 

 Carrot beetle (Ligyrus gibbosus). 

 Parsnip webworm (Depressaria heracliana). 

 Carrot rust-fly (Psila rosce). 



