When: 2016-05-27

Collection location: Eastern Shasta-Trinity National Forest, Siskiyou Co., California, USA [Click for map]

Who: Byrain

No specimen available

On Pinus ponderosa.


Proposed Names

94% (3)
Recognized by sight: Witches’ broom on Pinus ponderosa.
Used references: Westcott’s Plant Disease Handbook

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= Observer’s choice
= Current consensus


Add Comment
Elytroderma Needle Cast
By: Dan Molter (shroomydan)
2016-06-05 18:17:02 CDT (-0500)

“The fungus invades twigs and branches, causing stunting of
needles, reddened foliage, defoliation, and conspicuous brooming
(figs. 1-2). Brown, resinous lesions often develop in the
phloem of infected twigs (fig. 3). Infected needles are redbrown,
becoming pale over the summer, but the basal portion
(1/4-3/8 inch [6-10 mm]) remains green. Fruiting bodies appear
near the base of dead and dying needles in the spring and are
thin, elongated (approximately 1/2 inch [13 mm] long), and
dull black (fig. 4). Brooms are compact, globose, and contain
discolored needles, most of which are shed by fall.”


It is just a bunch of pine needles
By: Rocky Houghtby
2016-06-05 18:15:48 CDT (-0500)

…that present as a symptom of an infection by Elytroderma. Apparently the straw like coloration of the needle cast is characteristic of this pathogen.

Witches’ Broom
By: Byrain
2016-06-05 18:14:43 CDT (-0500)

Witches’ broom is a relatively common symptom of many plant pathogens which causes abnormal brush like growth on woody plants. In this case it is essentially a “Bunch of pine needles” and on Pinus in CA it seems to be as simple as symptom of an Elytroderma deformans infection unless maybe there is mistletoe present (Which was not here).

how is this not
By: Danny Newman (myxomop)
2016-06-05 18:02:30 CDT (-0500)

just a bunch of pine needles?