Diseases of Economic Plants 



In addition to the above-named plants, natural galls on 

 quince, plum, dewberry, raspberry, corn, turnip, salsify, 

 parsnip, lettuce, radish, cotton, alfalfa, clover, pecan, willow, 



Fig. 44. — Peach crown-gall. After Hedgcock. 



poplar, chrysanthemum, honeysuckle, euonymus, arbutus, 

 marigold, pyrethrum, peony, and oleander have been studied, 

 while a complete list of susceptible plants would include 

 many more. The disease in a form known as soft-gall is 

 found commonly on herbaceous plants or cane fruits. 



