MICR 3220 Lecture 10: MICR – lecture 10
30 Dec 2015
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Document Summary
In unfavourable conditions microorganisms can withstand better than plants. On plants you still have sheltered habitats (trees over winter. Active survival active growth on the plant. Phylloplane is still there, i. e. evergreen trees, pine needles. Bacteria and yeast can still grow over winter. We can also have active growth on leaf litter or on the surface of the soil (this works well for plant pathogens) Passive survival on leaf litter/surface of soil. Snow cover retains moisture in the ground allowing for organisms to stay alive. Think of phylloplane as an ecosystem with different communities of microorganisms where symbiosis occurs. Selective fungicides killed microorganisms: control plant diseases, resulting in other plant diseases becoming more severe, drops in population of certain phylloplane organisms. Biological control can occur on leaf surfaces. For space less than 1% of surface of leaf is actually occupied/suitable to live on by microorganisms.
