136 VEGETABLE GROWING PROJECTS 



root growth occurs near the surface of the soil and even then the 

 plants are small in size and of poor quality. The adult is a 

 small dark green fly with a yellow head. Eggs are usually laid 

 in cracks between the soil and the plant or on the plant. Young 

 maggots hatch in about a week, feed on the roots, and when 

 mature they make a cell in the soil in which to pupate. Adults 

 emerge in late summer and deposit eggs, the maggots of which 

 are often plentiful enough to injure the late celery. No definite 

 remedy is known. 



The celery butterfly, a beautiful black, swallowtail butterfly, 

 is the adult of the destructive celery caterpillar so well known on 

 account of its brilliant markings. It feeds on various allied 

 plants, but is seldom found on other crops. The honey-yellow 

 eggs are deposited singly on the leaves. They hatch into black 

 and white banded caterpillars which when mature are green in 

 color with strong black and yellow markings. Attention is often 

 attracted to the caterpillar because of curious orange-red scent 

 organs on its prothorax. Hand picking is a means of control. 



1. Describe the appearance of injury from rust fly on celery. 



CL : 181-185. 



2. How does this injury differ from its work on the roots of other 



plants? CL:183. 



3. What is the life history of the insect? CL : 182-184. 



4. Is control practicable? CL : 185. 



5. What is the life history of the celery butterfly ? CL : 188. 



6. Mention three noticeable facts about the caterpillar. CL : 188. 



