276 VEGETABLE GROWING PROJECTS 



resistant. Dusting with sulphur is effective in a dry climate like 

 California. 



1. Why is the asparagus beetle so destructive f CL : 203. 



2. Describe the color markings of the beetles. CL : 201-202. 



3. Describe the grub. CL : 203. 



4. Do parasites attack this pest? CL : 204. 



5. What are some methods for control f CL: 204-205. 



6. What are the symptoms by which asparagus rv^t may be 



recognized ? SH : 149-150. 



7. Why should clean culture and sanitation be practiced f 



8. What is the most effective method of combating asparagus rust ? 



9. Maintaining soil fertility. — Both the supply of organic 

 matter and plant food must be maintained from year to year in 

 order to obtain satisfactory crops. As a rule, stable manure, 

 10 tons or more to the acre, is used to keep up the supply of humus, 

 though cover crops are employed to some extent. Part of the 

 fertilizer is applied early in the spring and part at the close of the 

 cutting season. It is likely that 1000 pounds annually to the acre 

 can be profitably applied in well-managed plantations. Some 

 of the most successful growers use double this amount. For 

 composition see W: 271. 



1. How may the fertility of the plantation be maintained so as to 



secure satisfactory net returns? W-VG : 213-216. 



2. When should the fertilizer be applied? Are you certain that 



any immediate benefit is derived from early spring applica- 

 tions in fields that are to be cut ? 



