Observation 146086: Fusicladium Bonord.
When: 2013-05-21
No herbarium specimen

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Al.
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Eyes3
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Fusicladium
By: R.W. (Al.)
2014-10-07 17:55:16 CDT (-0400)

I looked through those links, and I didn’t find anything that swayed me one way or the other…….

However I now think if these are indeed black knot, those cankers would be considered Fusicladium, an asexual form of black knot fungus.

“The anamorph, or asexual, stage of the black knot fungus (Figure 8a) is a species of Fusicladium, that produces abundant olive-green conidia during the summer on the surfaces of one-year-old knots (Figure 9). It appears that the infection capabilities of the conidia are quite limited. Therefore, management strategies are focused on ascospore development and infection processes”

http://www.apsnet.org/...

Those things are definitely one year old, it would be interesting to see if conidia or ascospores are found on these large old conks.

Black Knot
By: R.W. (Al.)
2014-10-07 16:33:07 CDT (-0400)

Could someone please provide a link to show that Black knot takes this form?

I’ve been reading lot about it, and I see nothing to make me think this is black knot. Black knot looks like tar.

“The mature galls are hard, black, 10 to 15 cm (4 to 6 inches)”
http://www1.agric.gov.ab.ca/...

If someone would take the time to do microscopy for these giant cankers, I don’t think they would find Black Knot ascospores.

“Ascospores are potentially available from the time of bud break until terminal shoot growth stops, but the greatest number appear to be released during the period between white bud and shuck split”

http://nysipm.cornell.edu/...

RJK, what makes you think this is black knot?

Created: 2013-09-21 20:42:40 CDT (-0400)
Last modified: 2014-10-07 17:59:47 CDT (-0400)
Viewed: 76 times, last viewed: 2017-06-16 14:56:46 CDT (-0400)
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