82 BEET, SPINACH, AND CARROT DISEASE. 



through the pith, and onwards, till at last the leaves are 

 completely separated from the root, as in the case of the 

 potatoe and turnip, when the entire plant dies. On hand- 

 ling a plant in this condition, the top instantly separates 

 from the root. 



(331.) I believe that the carrot exhibits the effects of 

 the disease in a greater degree when it is running to seed, 

 as in that case it seems to become impatient of the injury 

 inflicted by the insect. 



(332.) The injury suffered by all these vegetables cor- 

 responds precisely with the mischief which the vastator 

 works upon the potatoe ; it is in fact a mere transposi- 

 tion of the damage from one plant to another. The insect 

 punctures the leaf, sucks its juices, injures the sap, and 

 causes either local death of the part first damaged, or the 

 general death of the plant by inducing gangrene at the 

 collar. 



