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Taylors Clematis :: History of the Clematis :: Pests and Disease :: Slime Flux

Clematis Slime Flux

History of the Clematis	Pests and Disease

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Symptoms

On old woody Clematis montanas, you will notice wilting and yellowing leaves or a failure to leaf in spring. Foul-smelling whitish or yellow or orange or pink, slimy ooze will be apparent at the base of the stem/trunk and / or in a puddle on the soil.

What we know

Clematis slime flux is a bacterial problem that can affect most old Montana species. Damaged areas of stem are colonized by bacteria, leading to wilting, dieback and the appearance of a foul-smelling exudate from the stem. The disease can be fatal, but plants can sometimes be saved by the pruning out of affected parts.

Clematis: clematis slime flux develops when a damaged part of the stem becomes colonised by bacteria that normally reside harmlessly in the soil or on the stem surface. Any factor that injures the stem can lead to the problem developing, for example; Frost damage Pest feeding Any type of mechanical damage (including strong winds twisting the stems) Even natural growth cracks Infection may also sometimes occur through the root system The bacteria penetrate deep into the stem tissues, and when the sugary sap rises in spring this is fermented by the bacteria to produce the foul-smelling slime. Gasses are also produced which force the slime out under pressure and may result in further stem splitting. A range of bacterial species, as well as other organisms such as yeasts and fungi, are often found within the slime, all taking advantage of the sugars within the sap.
Non-chemical control It can be difficult to prevent the stem damage that leads to the development of clematis slime flux. However, protecting plants from strong winds and frosts, and taking care when digging and working around them, may help It is sometimes possible to save an affected clematis by pruning out the stem below the point of slime production. With any luck, the plant will then re-shoot If a plant dies from slime flux it should be safe to remove it and replant with another clematis. In addition to removing the plant (with its root system) it would also be prudent to replace some of the soil in which it was growing with fresh topsoil