424 



STATE BOARD OF AGRICULTURE 



Sijmpfo)ii-<< of 7)/.s'rY/.sr,v of TJiis Type 



Many of the economically more important plant families contain indi- 

 viduals or groups of plants known to be affected with mosaic disease. More 

 than twenty families have been so recorded. The symptomatology is strik- 

 ingly similar for nearly all these plants, suggesting a close relationship among 

 the causal agents. With but slight modification or amplification the descrip- 



FiG. 1. Bean plant affected with mosaic, showlnj th3 typical niDttling and distortion of foliage. 

 Slightly reduced. 



tion of mosaic symptoms on any plant can be made applicable to any other 

 plant of a different group. (See Fig. 1, Bean Mosaic.) In general, typical 

 symptoms include: mottling of the fohage in darker and lighter areas, crink- 

 ling of the leaves, or other distortional modifications, dwarfing, reduction in 



