Fronds one side necrotic/other side normal -- cause for concern?

[Sandy Loam]

Several of the lower fronds on this CIDP are necrotic on one side, yet normal on the other side.  Is this cause for concern? See photos below.

Thanks, all, for your responses.

[rick]

Fusarium? http://edis.ifas.ufl.edu/pp139 

[PalmatierMeg]

Fusiarum wilt. Fronds die off one side at a time. Disease is fatal. Same wilt destroyed all my queens (10-12) within months two years ago. Take out palm, then pray it doesn't spread.

 

[Sandy Loam]

Thanks Meg, Rick and all.  The lower fronds have always turned brown as new ones grew into the crown, so is it possible that this just a coincidence?  I would like to give these two CIDPS a little more time so see if this truly a pattern.  Is that a bad idea, or should I just be overcautious and  dig both CIDPs out immediately?  When I cut off the lower fronds (in photos), there seemed to be at least 5 fronds (between the two adjacent CIDPs) which displayed this one-sided necrotic pattern, although it wasn't 100% clear to me that they were truly different from one side of the frond to the other, so I don't want to jump to conclusions too quickly.

Does that change your advice? (Meg, or anyone else out there)

 

[PalmatierMeg]

If it does have wilt, the palm will be dead within a few weeks. This disease kills fast.

[Keith N Tampa (ex SoJax)]

If the Palm looks like a dog now, remove it.  I had one in Jax that did exactly what yours is doing and it took 5 years before if finally died.  I didn't have it tested for fusarium, but I always assumed that's what it was.  The good thing is that fusarium wilt doesn't get on all that many Palm species.  Even the form that kills CIDP isn't necessarily going to kill queens.  Just don't replace it with a species known to be susceptible.  In my yard, it was surrounded by other palms that didn't become diseased, including a queen. I had butia, Sabal, livistona, queen, needle....  

[PalmatierMeg]

I realize my queens were killed by a subspecies/variety of the wilt that kills CIDPs. And it kills them within weeks  of symptoms. But the symptoms are exactly the same as the CIDP variety. I still suggest you not replace your canaries with queens (or Washies) as these wilts are very closely related. I do find it odd that the queen wilt also kills Washies, two quite different palm species. My W. robusta has so far escaped infection. The Syagrus species on my garden lot still appear healthy.

[Keith N Tampa (ex SoJax)]

40 minutes ago, PalmatierMeg said:

I realize my queens were killed by a subspecies/variety of the wilt that kills CIDPs. And it kills them within weeks  of symptoms. But the symptoms are exactly the same as the CIDP variety. I still suggest you not replace your canaries with queens (or Washies) as these wilts are very closely related. I do find it odd that the queen wilt also kills Washies, two quite different palm species. My W. robusta has so far escaped infection. The Syagrus species on my garden lot still appear healthy.

Meg, fusarium wilt does kill CIDP quickly sometimes, like it did your queens.  That's why I wasn't sure my canary actually had fusarium....  And you are right, Washingtonia are also susceptible.  Sheesh, we've lost a lot of Washies here in Winter Haven in the last 18 months....  I'm not sure we truly understand the fusarium host range, yet.  Obviously we didn't know it could infect queens and Washies until the last few years.  It crosses my mind that any palm pruned with tools that have been used on an fusarium infected Palm are likely to be inoculated.  Clearly that doesn't mean they will be infected, but considering intense nursery culture, it seems like conditions are optimum for pathogen development/evolution.

 

 Epidemiology fascinates me after seeing real-life impacts.  Citrus greening opened my eyes in a way only personal experience can.  No matter how many times I heard about the Irish potato famine, it was just a far-removed historical fact.  When you see how the citrus industry in FL is being ravaged, you can see how the Irish potato famine crushed a population, especially a society so dependent on that crop.  Luckily palms and citrus aren't required for society to thrive but imagine if it were corn, wheat, soy, or rice.  The human suffering would be immense.