166 CHAPTER X 



the extracted oil is employed as a salad oil, and the crushed 

 cake is a valuable concentrate for dairy cows. Peanut butter, 

 made from the ground peas, or nuts with or without the addition 

 of oil, is a palatable and nutritious article of human food and 

 is rapidly growing in popularity. 



Pests. — Leafspot (Cercospora personata) may be trouble- 

 some during very wet spells, but is seldom serious. It causes 

 the wilting of the plant and premature ripening of the crop. 



The crop has few insect pests. The cutworm sometimes 

 does some harm. The nuts are also subject to attack from 

 weevils if kept too long, and a certain root aphis occasionally 

 attacks the plant. 



REFERENCE: 

 » De Condolle.—" Origin of Cultivated Plants." 



