Help with my Cert. Arb please

[DanClimbsTrees]

I seem to remember being told to be careful to distinguish between colonisation and infection. Colonisation is the establishment of the pathogen on the tree, perhaps a spore in a wound. Infection is when the germinated spore enters into the cells of the host tree.

 

So I think it refers to how the fungus gets in. The primary ones are sapwood intact, sapwood exposed, active pathogenisis and heartwood.

 

If I'm right. it's not the same as decay strategies which relate to the woody component attacked (lignin, cellulose, hemi-cellulose) and come usually under the headings of white, brown and simultaneous rots. These are infection rather than colonisation.

 

So again if I'm right the main ways for a fungus to get in is through a wound, through a decayed taproot or deep wound into heartwood, by being there dormant since the tree's infancy or by forcing its way in through the roots.

 

Thanks for your comment, Jules. Much appreciated!

 

So, the definitions for the following would be...

 

Sapwood exposed: Bark and cambium gone, fungus colonizes the exposed sapwood.

 

Sapwood intact: Bit confused on this, does it mean the spores enter elsewhere and then colonize the sapwood without the need for it to be exposed to the elements?

 

Active pathogenesis: Umm....

 

Heartwood: Either exposed heartwood or bypasses bark, cambium and sapwood?

 

Thanks for your help

[Mick Dempsey]

Reminds me of something I read somewhere about a poster in a hospital.

Picture of a newborn baby with the solemn warning for the pediatric staff "THE FIRST TEN MINUTES OF A PERSONS LIFE CAN BE THE MOST DANGEROUS, BE VIGILANT"

Some one took a biro and wrote underneath.

"The last ten minutes can be pretty tricky as well"

 

I'll get me coat.

Edited July 16, 2015 by Mick Dempsey

[jaime bray]

Google scholar three Alan Rayner paper Dan. It will be explained in there and you'll get a complete grasp of it.

[kevinjohnsonmbe]

Reminds me of something I read somewhere about a poster in a hospital.

Picture of a newborn baby with the solemn warning for the pediatric staff "THE FIRST TEN MINUTES OF A PERSONS LIFE CAN BE THE MOST DANGEROUS, BE VIGILANT"

Some one took a biro and wrote underneath.

"The last ten minutes can be pretty tricky as well"

 

I'll get me coat.