Any agent that removes, kills, or inactivates disease-causing organisms before they can cause infection.
Visible only with the aid of magnification.
Refers to many fungi able to survive in the soil as saprophytes. Also called "soil inhabitant."
The reduction in size of an organ by distributed metabolism.
Outgrowth or swelling of unorganized plant cells produced as a result of attack by bacteria, fungi, or other organisms.
Crown gall of verigated Euonymus. The normal size of this infected stem can be seen on the top left side of the gall.
Photo by Jay W. Pscheidt, 1988.
Microorganisms found in phloem tissue that resemble mycoplasmas in all respects except that they cannot be grown on artificial nutrient media (yet). Formerly known as mycoplasmalike organism (MLO).
Female egg cell of oomycete fungi.
Pertaining to a disease in which an infection leads to general spread throughout the plant body. Also, a chemical that spreads internally through a plant.
A thick-walled asexual resting spore formed by the modification of a fungus hypha.
Chlamydospores characteristic of Thielaviopsis under high magnification (400x).
Melodie Putnam.
A relationship between a plant and a causal agent in which the plant does not become diseased.
