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Category Archives: The Relationship Between the California Buckeye and the Fungus Eutypella aesculina
JimThe Relationship Between the California Buckeye and the Fungus Eutypella aesculinaNovember 18, 20170 Likes

Buckeye Branch Bumps

18 November 2017, Columbia California.

I realized that there is a growth anomaly on one of the buckeyes, and it was the buckeye that had the most pronounced fungal bodies of Eutypella. The branches of this buckeye has lots of bumps on them. The other buckeyes do not seem to have this problem.

Photos of the bumpy buckeye are at the top. Photos of a normal buckey are lower down on the page. Click an image to enlarge it.

 

The buckeye with the bumps on the branches

The buckeye with the bumps on the branches

Bumps on branch of buckeye. A valley oak is behind the buckeye.

Bumps on branch of buckeye. A valley oak is behind the buckeye.

Bumps on buckeye branches.

Bumps on buckeye branches.

bumps on buckeye

bumps on buckeye

bumps on buckeye

bumps on buckeye

bumps on buckeye

bumps on buckeye

bumps on buckeye

bumps on buckeye

bumps on buckeye

bumps on buckeye

 

 

 

 

 

A normal buckeye, without bumps on the branches.

A normal buckeye, without bumps on the branches.

Closeup of a normal, bump-less buckeye.

Closeup of a normal, bump-less buckeye.

Normal buckeye

Normal buckeye

Normal buckeye

Normal buckeye

 

JimThe Relationship Between the California Buckeye and the Fungus Eutypella aesculinaMay 28, 20170 Likes

Leaf Fungus on Buckeyes along Parrotts Ferry Road

A survey of buckeyes along Parrotts Ferry Road, as it heads down the canyon, also show that the buckeyes are experiencing a sort of leaf and branch dieback.  Photos 27 May 2017.

See also the post on the Stockton Road buckeyes, showing the same ailment.

Click to enlarge.

Buckeye along Parrotts Ferry Road. It too shows the leaf dieback.

Buckeye along Parrotts Ferry Road. It too shows the leaf dieback.

detail of the leaf dieback.

detail of the leaf dieback.

The same leaf fading and dieback.

The same leaf fading and dieback.

Another buckeye showing leaf fade and dieback.

Another buckeye showing leaf fade and dieback.

Detail of leaf fading. My fingers are behind the leaves.

Detail of leaf fading. My fingers are behind the leaves.

more leaf fade and death

more leaf fade and death

detail of leaf dieback

detail of leaf dieback

This buckeye too shows spots of leaf dieback.

This buckeye too shows spots of leaf dieback.

A spot where a branch is dieing.

A spot where a branch is dieing.

buckeye leaf dieback

buckeye leaf dieback

buckeye leaf dieback

buckeye leaf dieback

buckeye leaf dieback

buckeye leaf dieback

leaves showing possible fungus

leaves showing possible fungus

leaf spot

leaf spst

JimThe Relationship Between the California Buckeye and the Fungus Eutypella aesculinaMay 28, 20170 Likes

Leaf Fungus on Buckeyes Along Stockton Road, Sonora

These images show the buckeyes along Stockton Road, across from Save Mart, in Sonora. They too show the spotty dieback of whole branches, and the apparent leaf fungus problems. 27 May 2017.

Buckeyes along Stockton Road, from afar, show a couple of large spots of branch dieback. 27 May 2017.

Buckeyes along Stockton Road, from afar, show a couple of large spots of branch dieback. 27 May 2017.

Close-up of the above photo, showing the larger dieback spots, easily seen from a distance. Up closer examination reveals more, smaller areas

Close-up of the above photo, showing the larger dieback spots, easily seen from a distance. Up closer examination reveals more, smaller areas.

Dieback of branches on California buckeyes.

Dieback of branches on California buckeyes.

Leaf and branch dieback on California buckeye, along Stockton Road, Sonora, 27 May 2017.

Leaf and branch dieback on California buckeye, along Stockton Road, Sonora, 27 May 2017.

leaf details

leaf details

leaf details

leaf details

Leaf details

Lear details

leaf details

leaf details

lear details

Lear details

Leaf dieback

leaf dieback

leaf details

leaf details

leaf details

leaf details

 

 

JimThe Relationship Between the California Buckeye and the Fungus Eutypella aesculinaMay 22, 20170 Likes

More photos of the ?leaf fungus?

22 May 2017, Columbia Ca.

Click to enlarge.

 

JimThe Relationship Between the California Buckeye and the Fungus Eutypella aesculinaMay 1, 20170 Likes

Leaf Fungus on California Buckeye

A few branches and leaves on the California Buckeye, known to have Eutypella are showing some, assumed, fungal dieback.

Images taken 30 April and  1 May 2017.

Photo showing the overall appearance of the buckeyes.

Photo showing the overall appearance of the buckeyes.

There is an affected branch in the center area.

There is an affected branch in the center area.

Fading on some leaves.

Fading on some leaves.

Closeup showing dieback in a couple of spots on the primary tree.

Closeup showing dieback in a couple of spots on the primary tree.

Dieback visible here.

Dieback visible here.

Leaves showing distorted growth.

Leaves showing distorted growth.

Dieback areas

Dieback areas

 

 

 

 

JimThe Relationship Between the California Buckeye and the Fungus Eutypella aesculinaJanuary 2, 20170 Likes

The fungus Eutypella aesculina on dead branches of the California Buckeye

While removing dead branches from some California buckeye trees near Columbia California, in December of 2016, I noticed many of these dead branches were covered with small black, dot-sized protrusions. Examining the spots under a microscope revealed that these things were some sort of fungus. I sent samples to Dr. Suzanne Rooney Latham, Senior Plant Pathologist at the Plant Pest Diagnostics Lab of the Plant Health and Pest Prevention Services section of the California Department of Food and Agriculture. Dr. Latham reported, on 30 January 2017, that the fungus is probably Eutypella aesculina. See Mycobank and this GBIF site.

This fungus was originally collected in 1893 by W.C. Blasdale, [see also this UNC page] in Berkeley California, on, of all things, dead branches of the California buckeye, Aesculus californica, the same species as our samples were from. This is the historical reference. It appears that Blasdale’s specimens were then described by Ellis and Everhart: Eutypella aesculina Ellis & Everhart. (1893). Ellis assigned it the species name ‘aesculina‘ from the genus name of the California buckeye, ‘Aesculus‘.

As there are no other host records for Eutypella aesculina in the mycological databases, other than California buckeye, it may well be that this fungus, Eutypella aesculina, is a specialist on California buckeye.

This site lists other species of Eutypella. Notice there are no photos listed for aesculina; it is rarely recorded. We have photos here.

The fungus is causing no obvious damage to the buckeyes; the trees are very healthy, and the fungal bodies are only seen on dead branches.

Thanks to Dr. Suzanne Latham for the great identification, and sharing information and the high power photo of the fungus’s allantoid (sausage-shaped) ascospores.

Click on an image to enlarge it.

Allantoid ascospores of Eutypella aesculina. Photo courtesy of Dr. Suzanne Latham.

Allantoid ascospores of Eutypella aesculina. Photo courtesy of Dr. Suzanne Latham.

 

Some of the buckeye trees examined. They are on the edge of the property, growing along an old mining ditch.

Some of the buckeye trees examined.

A small buckeye branch next to a ruler to show the size of Eutypella aesculina

A small buckeye branch next to a ruler to show the size of Eutypella aesculina

Close-up of the fungus Eutypella aesculina.

Close-up of the fungus Eutypella aesculina.

You can see that the fungus Eutypella aesculina emerged from under the outer bark.

You can see that the fungus  emerging from under the outer bark.

You can see that the You can see that the fungus Eutypella aesculina emerged from under the outer bark.

You can see that the fungus Eutypella aesculina emerged from under the outer bark.

Closeup showing detail of the fungus Eutypella aesculina.

Closeup showing detail of the fungus Eutypella aesculina.

Closeup showing detail of the fungus Eutypella aesculina.

Closeup showing detail of the fungus.

First of a series of images showing Eutypella aesculina, starting from the top.

First of a series of images showing Eutypella aesculina, starting from the top.

Second in the series, showing UNDER the protrusion. You can see that the circumference has a black line of demarcation.

Second in the series, showing UNDER the protrusion. You can see that the circumference has a black line of demarcation.

Third in the series shows the branch directly under the protrusion, and the black line marks its perimeter.

Third in the series shows the branch directly under the protrusion, and the black line marks its perimeter.

Fourth in the series, is a close-up of the underlying branch, the black line being the outer limit of the protrusion.

Fourth in the series, is a close-up of the underlying branch, the black line being the outer limit of the protrusion.

Fifth in the series, shows the inside of the black protrusion.

Fifth in the series, shows the inside of the black protrusion.

Sixth, shows a close-up of the interior of Eutypella aesculina. It is hollow.

Sixth, shows a close-up of the interior of Eutypella aesculina. It is hollow.

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