ROOT CROP PROJECTS 195 



6. How does the work of the carrot rust fly on celery and on carrots 



differ? CL:153. 



7. What is the relation of curly top disease to leaf hopper attacks on 



beets? CL:93. 



8. Do hoppers from near-by fields endanger the crop? CL : 93. 



9. What is the life history of the beet leaf hopper? CL : 94. 



10. How does the insect feed? CL:94. 



11. What are some other insects injuring root crops? CL : 90-107. 



12. What are the common and cultivated food plants of the spinach 



leaf miner? CL: 90-91. 



13. What form of the insect causes the damage? CL : 91-92. 



14. What is the nature of the injury ? CL : 91-92. 



15. What control measures are practiced? CL : 92. 



14. Harvesting and marketing. — Root crops are usually har- 

 vested as soon as they attain marketable size, for any considerable 

 delay is certain to result in depreciation of the quality, the roots 

 becoming pithy, tough, or fibrous. This is especially true of the 

 radish. Even a few days may make a great difference in the 

 quality of early radishes, for they soon attain an abnormal size, 

 with accompanying pithiness or toughness, and a sharp, unpleasant 

 flavor. 



It is also exceedingly important to sell early beets while they 

 are tender and succulent, and, though small in size, they may 

 command better prices than if allowed to grow for several weeks 



