Diagnosis - Dryopteris help! (pics)

greenman28 NorCal 7b/8aJune 17, 2009

This spring, something's gone wrong with my Dryopteris fern. This one is the worst hit,

but there is another that is affected. I cut the fronds off after taking these pics. Here are

a few pics - the first is from last year, when the fern was looking nice. The differences I

note are a). the slow, cool spring we've had and b). the grass that had crowded the fern.

I'm wondering if either of these factors is the culprit, or if it's some other pathogen.

Last year:

This year:

The fronds:

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lycopus(z5 NY)

I am not familiar with diseases of ferns, so it could be a virus or other pathogen. However, is it possible that it got hit by an herbicide? It is pretty close to the lawn and chemicals like 2,4-D can cause unusual growth at low doses.

    Bookmark   June 18, 2009 at 12:58PM
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violet_sky(z8 Portland OR)

I'm no expert on ferns but it could be a fungal gall. If so, pruning is a good start.

    Bookmark   June 21, 2009 at 12:33AM
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greenman28 NorCal 7b/8a

Thanks for the suggestions.

So I take it you've never seen this particular occurence before? I certainly haven't been
able to find anything that matches on-line. I haven't even been successful in searching
for problems affecting Dryopteris ferns.

I think I'll dig this fern up, remove all of the wire grass, and then give it another go.

Josh

    Bookmark   June 21, 2009 at 3:41PM
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