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FOOT ROT GUMMOSIS - CITRUS

Richmond, TX(Zone 9a)

This is a well known disease in fruit trees. I am sharing with you my limited experience with gummosis on one of our Satsuma trees and how I am treating it.

In simple terms, foot rot gummosis in citrus occurs when zoospores splash into wound or bark crack around the trunk base. Zoospores travel thru rain and/or irrigation, contact the roots, germinate and cause root rot. They can affect other parts of tree but this discussion is limited to disease on citrus trunk bases.

Upon initial inspection I thought deer had damaged the trunk (and they may very well have wounded the tree) but excessive rains are probably more of a factor, encouraging zoospore travel. Once I noticed orangey sap oozing from the base I knew this needed further attention. It is a contagious disease so prompt attention is important.

Here are two pics of what the base of my Satsuma looked like:

Thumbnail by vossner Thumbnail by vossner
Richmond, TX(Zone 9a)

Here are my tools, a scraper, thoroughly washed with Clorox and dried; and a copper fungicide, available at HD.

Thumbnail by vossner Thumbnail by vossner
Richmond, TX(Zone 9a)

The hardest part (not really hard) was to sit as close as possible to the base of the trunk so I could scrape all the soft and dead tissue, as well as any sap. I scraped until I felt firm tissue. In my case, there was not much scraping to do. After scraping, I thoroughly sprayed the area with the fungicide. Here are two pics of how the trunk looked post scraping

This message was edited Jul 20, 2016 2:44 PM

Thumbnail by vossner Thumbnail by vossner
Richmond, TX(Zone 9a)

I will post an update on the success of my treatment of choice. My tree is under 10 years old and I saw no evidence of damage in foliage, branches, fruit--just the base of the trunk.

Here are two links I found useful when researching gummosis:

http://www.idtools.org/id/citrus/diseases/factsheet.php?name=Phytophthora

http://aggie-horticulture.tamu.edu/citrus/l2313.htm

Richmond, TX(Zone 9a)

A final pic shows some of the sap removed from the trunk. It was hard are resin! I have lost the tag on my Satsuma, it could be Seto or Owari, not sure

Thumbnail by vossner

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