Oomycetes- More Photos


Disease causing fungi. 1.5 to 2.5 in diameter, clear, colorless and are not septated. In the world of fungal taxonomy, most of the disease causing fungi have been put into a kingdom of their own, seperate from fungi.


Fungal Pathogen and Spores

1.  This is a disease causing "white rot" fungus. Possibly one of the species of Phythium.  Hyphae is stained with trypan blue.

2.  Fungal pathogen in root, probably Fusarium.  Within the cell of the plant, when you start seeing tightly packed spores, be concerned that you are dealing with fungal pathogens.

Fungal Pathogen

3.  Find the smallest bacterium (red arrow) to determine the diameter of the fungal hyphae.  It looks like 2 - 2.5 micrometers. This fungal hypha is clear or colorless. We're seeing the color behind it. This is one of the "bad guy" fungi.  The disease causing fungi tend to be the narrow diameter, clear colored strands.

Measuring Diameter of Fungal Hypha