SALAD CROP PROJECTS 135 



made especially for the purpose. When boards are given the 

 proper care they will last for years, and many growers of com- 

 paratively small areas continue the. use of boards. 



Late celery is generally ridged with soil to some extent in the 

 field for the purpose of blanching the stalks. This operation 

 generally begins with the cooler fall weather. If started too soon, 

 when the weather is warm, the stems may be discolored more or 

 less. Hilling hoes and shovels may be used in small plantations 

 to ridge the plants, while plows and special horse-drawn hillers 

 are employed in the large commercial plantations. 



1. What Idnd of celery do American markets demand ? 



W-VG : 315. 



2. How does blanching affect the color, texture, and quality of 



celery? W-VG : 316. 



3. Describe the different methods of blanching early celery. 



Late celery. W-VG : 316-318. L : 137. C : 202-204. 



4. How much lumber or paper will you need to blanch your crop ? 



5. What is chlorophyll and under what conditions is it formed f 



6. Describe the physiological effects of blanching. 



7. Secure all the information you can about celery hillers, blanching 



paper, and machines used to apply the paper. Inquire of 

 growers. Write manufacturers. 



19. Combating insects and diseases. — Fortunately celery does 

 not have many serious insect enemies. The carrot rust fly, a 

 native of Europe, is an insect which seriously dwarfs celery stalks 

 through the destruction of the fibrous roots by maggots. The 

 whitish sickly plants seldom outgrow the attack unless new fibrous 



