Farm Progress is part of the Informa Markets Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Serving: East

Here are images of bacterial blight and target spot symptoms

Lesions only progress to the middle and sometimes upper canopies when significant defoliation of the lower canopy has occurred (image 7)
Knowing the difference between bacterial blight and target spot will help in management decisions.

Research scientists and Extension specialists are learning more about Target spot in cotton. “Here’s what we know," says  University of Tennessee Institute of Agriculture plant pathologist Heather Kelly: "Fungus survives on cotton debris; infection depends on variety and location; yield loss can be 150 pounds of lint per acre or more; higher losses are more likely as yield increases; target spot develops after canopy closure; and late planted cotton is at lower risk."

She says symptoms differ from bacterial blight but confusion may be possible without close observation. "Boll rot is the main yield loss mechanism of bacterial blight, while target spot causes defoliation that has been correlated to yield loss," she said.

“Bacterial blight has had a minimal impact on yield so far in Tennessee,” Kelly said, “with little boll rot being observed so far.”

Here are images that show symptoms for each disease.  (Images courtesy of University of Tennessee Institute of Agriculture.)

Read more:



TAGS: Fungicide
Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.