308 



Gardening 



Univ. of Wis. Agric. Expt. Sta. 



FIG. 173. The rows of cabbage at the right were grown from seed from re- 

 sistant stock. They have inherited the power of the parent plants to resist the 

 disease. The plants on the left are from ordinary seed. 



conducted by agricultural experiment stations or by seed 

 firms that produce seeds on a large scale. However, the 

 home gardener may secure seed, whenever available, of 

 desirable varieties known to be resistant to certain 

 diseases. When a disease tends to reappear year after 

 year, resistant varieties are especially valuable. For 

 example, the fungus that causes the " yellows " of cab- 

 bage is believed to persist in infected soil for a number 

 of years, and the growing of cabbages in such soil is only 

 possible when one uses seed of plants that are resistant 

 to this disease (see Figs. 172 and 173). 



Whenever any noticeable and markedly injurious fun- 

 gous disease or insect (see next chapter) appears among 

 any of the vegetable crops, one should determine with- 

 out delay the nature of the injury. If this cannot be 



