- Root Fungi - Overview
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- L ... undecomposed litter
- F ... fermented/ partly decomposed
- H ... humus/ well decomposed ... "pay dirt"
- conifer vs. deciduous (mor, moder, mull)
- overall
- rich in OM
- much competition for nutrients & energy
- conifer - thick LFH, deciduous thin LFH
- trees compete with micro organisms
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- A ... Ae / Ah
- B ... "enriched", Bh / Bf
- C ... weathered parent material
- overall
- cooler
- less OM
- less microbial activity
- texture
- fine vs coarse ... moisture & heat
- loam is middle of the road (baby bear's porridge)
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- Mycostasis (general inhibition)
- 3 causes
- antagonism (active hostility ... toxins/ antibiotics)
- competition (water, nutrients, energy)
- harsh environment (usu. temp & moist.)
- mycostasis high in LFH/ low in mineral soil
- tea time
- Root Fungi
- Soil Inhabiting Fungi (asco)
- not host specific
- rest as spores, waiting for young roots
- primarily a nursery problem
- Mycorrhizae (zygo, asco & basidio)
- symbiotic
- Root Inhabiting Wilts (asco)
- typically very host specific
- live in sapwood
- transpiration issue
- black stain & dutch elm disease
- Root Inhabiting Decays (basidio)
- fairly host specific
- Similar to heartrot/ wood decays
- Cannot travel freely in soil (mycostasis)
- Facultative saprophytes (vs facultative parasite)
- root rots
- Root Structure
- bark
- outer bark (rhitidome)
- periderm (cork)
- inner bark (live bark)
- cambium
- wood
- heartwood (if large/ old enough)
- sapwood
- Root Inhabiting Decays (basidio)
- Initial Infection
- spores
- vegetative (root contact)
- Travel along the root - see Root Structure
- Typical Symptoms
- decreased growth
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