Damage symptoms
The first signs of this disease, are poorly looking plants in localized areas of the greenhouse or field. The affected plants may wilt. Also, interveinal chlorosis of leaves and premature defoliation may occur. Looking at the roots, there are three different symptoms. Small feeder roots rot completely. Small roots may show smooth brown lesions. On older roots, the outer layers become swollen and corky and gradually break off. The corky areas often occur as horizontal bands on the roots with lengthwise cracks. No discoloration is present in the xylem tissues which distinguishes it from wilts caused by Verticillium or Fusarium. Progressive disease causes more and more destruction of the root system and subsequent loss of vigour and further wilting.
