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Phytophthora root rot (Phytophthora dreschleri) on Cabbage (Brassica oleracea)


15 Images
5368320
Paul Bachi
University of Kentucky Research and Education Center

Lower stem of a symptomatic plant. Fungal growth on the outside of the lower stem is not from the causal agent.

5368321
Paul Bachi
University of Kentucky Research and Education Center

Stem split to see decay of pith tissue of the lower stem.

5368322
Paul Bachi
University of Kentucky Research and Education Center

Close-up of infected pith tissue with disking similar to that seen with Black shank of tobacco.

5368323
Paul Bachi
University of Kentucky Research and Education Center

Stem split to see decay of pith tissue of the lower stem.

5368324
Paul Bachi
University of Kentucky Research and Education Center

Pith tissue incubated in water induces formation of a sporangium. This one is empty of spores.

5368325
Paul Bachi
University of Kentucky Research and Education Center

Pith tissue incubated in water induces formation of several sporangium.

5368326
Paul Bachi
University of Kentucky Research and Education Center

Mycelium of Phytophthora dreschleri in culture.

5368327
Paul Bachi
University of Kentucky Research and Education Center

Swollen, lobed, sporangia of Phytophthora dreschleri in culture.

5368328
Paul Bachi
University of Kentucky Research and Education Center

Two sporangia where a new sporangium is growing up through the remains of an older, empty sporangium.

5368329
Paul Bachi
University of Kentucky Research and Education Center

A new hyphal structure growing from below the base of an older, empty sporangium.

5368330
Paul Bachi
University of Kentucky Research and Education Center

A sporangium before it has released its spores.

5368331
Paul Bachi
University of Kentucky Research and Education Center

Zoospores just in the process of releasing from a sporangium.

5368332
Paul Bachi
University of Kentucky Research and Education Center

Zoospores swimming away from the sporangium.

5368333
Paul Bachi
University of Kentucky Research and Education Center

Zoospores released from the sporangium with two remaining in the sporangium.

5368334
Paul Bachi
University of Kentucky Research and Education Center

Zoospores beginning to move away from the vicinity of the sporangium.