Observation 83921: Botrytis P. Micheli ex Haller
When: 2011-11-30
Who: Byrain
No herbarium specimen

Notes: Growing on an old rose bud still attached to the plant.
The ends of the hyphae have many tips each covered with attached spores, it was impossible to count how many. The spores were tan, smooth, non-amyloid, and has a narrow cell wall at the apex where they were attached to the hyphae.

Spores measured = 30
Spore range = (11) 11.5 – 15 × 8 – 9 (10) μ
Average spore = 12.9 × 8.15 μ
Average Q = 1.6

Images

186955
186956
186957
A few hours earlier.
186958
Spores
1000x
Mounted in melzers
1μ divisionses
186959
Spores
1000x
Mounted in melzers
1μ divisions
186960
Attached spores
1000x
Mounted in melzers
1μ divisions
186961
Clamped hyphae
1000x
Mounted in melzers
1μ divisions
186962
Clamped hyphae
1000x
Mounted in melzers
1μ divisions
186963
Hyphae and spore mass
100x
Mounted in melzers
1μ divisions

Proposed Names

28% (1)
Recognized by sight
31% (2)
Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
Conidia?
By: Byrain
2011-12-02 09:37:39 PST (-0800)

I’m, not sure if I am understanding the definition correctly, are my spores conidia? And if this species forms sclerotia, would it necessarily be visible? Or possibly doesn’t always form or could be below the surface of the rose bud? There is none on the surface of the rose bud.

I found identification info and a key here – www.alliumnet.com/images/onion%20Botrytis%20Diagnostic%20Guide%20-%20PHP%20Nov%202007.pdf
(Edit: Link fixed, you have to copy and paste it though…)

Assuming I am right about conidia and this species doesn’t form sclerotia, I end up at B. byssoidea. Assuming I am right about conidia and this species does form sclerotia, it doesn’t key out well.

Edit: Botrytis does occur on rose buds apparently and doesn’t seem to be host specific.
http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7463.html

Created: 2011-12-02 00:47:04 PST (-0800)
Last modified: 2011-12-02 09:37:46 PST (-0800)
Viewed: 67 times, last viewed: 2017-02-15 18:29:20 PST (-0800)
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