258 VEGETABLE GROWING PROJECTS 



by diseased seeds. Control of this trouble is largely a matter of 

 planting clean seed. Clean cultivation and crop rotation are 

 also advisable. Vines should not be cultivated when they are 

 wet. Lima beans are resistant to this disease. 



Blight is the name given to a common bacterial disease which 

 attacks all varieties of both field beans and lima beans. Upon 

 the leaves large, brown, watery spots are produced which become 

 dry, thin, and papery. The disease soon extends to the pods, 

 where similar watery spots are developed. Blight is spread by 

 infected seeds, and the methods of control are therefore similar 

 to those for anthracnose. 



Rust may be distinguished from the above-mentioned diseases 

 by the fact that small blister-like spots are found on the leaves 

 and stems. These break open and are full of rusty brown or 

 blackish powder, which is in reality the spores of the fungus. 

 Rust usually develops rather late in the season but is often the 

 cause of very severe damage. The use of the resistant varieties 

 forms the most effective means of control. 



1. What is the life cycle of the bean weevil? CL : 58-59. 



2. How can the adult be distinguished? CL : 57-58. 



3. Name three other bean weevils. CL : 60-63. 



4. What is the best remedy ? CL : 64. 



5. What caution should be taken in handling carbon bisulphide? 



CL:63. 



6. What are the symptoms by which anthracnose of beans may be 



recognized ? SH : 152. 



7. How may anthracnose be controlled f SH : 154. 



