(pl. aecia) - One of the reproductive structures in the life cycle
of a rust fungus. Aecia normally appear as blisters on the host plant.
- Spores produced in an aecium.
host - Host in the life cycle of a rust fungus on which the
pycnial and aecial stages are formed.
- Spores produced in a saclike structure (the ascus). This structure
is typical of a large group of fungi, the Ascomycetes.
- A spore borne on the outside of the reproductive structure called
a basidium. This structure is typical of the group of fungi called
- A layer, one- or two-celled thick, between the xylem and phloem
in higher plants. The cambium produces both of these tissues, resulting
in diameter growth.
- A localized necrotic lesion of the cambium.
(adj. chlorotic) - The loss of green pigment in a plant due to the
plants inability to produce chlorophyll.
- A fruiting body of a wood decay fungus that bears basidia.
- Having growth, development, or other biological activity suspended;
- Of or relating to the back; belonging to or situated on or near
the upper surface.
- Growing from a dormant bud that has been exposed to light and air.
- Solid larval excrement, as left by defoliators; wood fragments made
by a wood-boring insect, usually mixed with excrement.
Bodies - Any structure formed of mycelia that contains spore
(pl. fungi) - A nongreen plant with a vegetative body formed of tubular
filamentous cells (hyphae). Fungi reproduce by spores.
- Period of time required to complete the life cycle of an insect.
- Tumorlike swellings on boles, branches, or twigs, caused by feeding
of sucking insects.
(pl. haustoria) - A specialized structure of a pathogen that is capable
of direct penetration into, and nutrient absorption from, a host plant.
- The first region of the insect body. Eyes, mouth parts, and antennae
(where present) are attached in this region.
- A sweetish secretion produced by sucking insects, particularly aphids
- A plant which provides nutrition for an invading parasite.
Range - The various plants which a pathogen can infect.
- The establishment of a feeding relationship between a host and a
Court - Point of entry and establishment of a pathogen in
the host organism.
- The life stages of an insect larva between molts.
(pl. larvae) - A young insect differing fundamentally in form from
the adult (compare to nymph).
- Series of changes through which an insect passes in developing from
egg to adult.
- A mass of fungal filamentous cells. It forms the vegetative
body of the fungal plant.
- A group of microscopic organisms intermediate between bacteria and
- Young stage of insect which does not fundamentally differ in form
from the adult (compare to larva).
- An organism that lives on or in, and obtains its food from, another
- Reproduction without male fertilization.
- An agent that causes disease.
(pl. perithecia) - A closed bulb- or ball-shaped fruiting body with
a pore through which ascospores are extruded, usually in a gelatinous
host - The host of a rust fungus on which the telial stage
of the fungus is produced.
- Firstthoracicsegment bearing the first pair of legs but no wings.
(pl. pupae) - The intermediate life stage between the larva and the
- To become a pupa; to pass through a pupal state.
- Exudation of pitch from a wound or infection on a conifer.
- The ability of a host to slow the development of a disease.
Breeding - The selection and deliberate propagation of those
individuals in the population which display resistance to a specific
- A thick strand of mycelium in which the hyphae have lost their individuality;
similar in appearance to a small root.
- Any organism which feeds on dead organic matter.
- A subdivision of an animal body or appendage.
Mold - A dark or black velvety coating of mycelium of various
fungi growing in insect honeydew on the leaves, fruit, or other exposed
parts of plants.
- The reproductive unit of fungi. Spores function in the same way
that seeds do for higher plants.
(pl. sporodochia) - A cushion-shaped vegetative structure covered
with spore bearing cells.
(pl. stromata) - A compact vegetative structure on, or within which,
fruiting bodies are formed.
(pl. telia) - Specialized fruiting structure of a rust fungus which
produces teliospores. Generally, telia appear as hairlike filaments
on the underside of leaves of the host.
- In a rust fungus life cycle these resting spores are the normal
overwintering spore form. They germinate in the spring and generate
(Adj. thoracic) - The second (middle) region of the insect body. The
six true legs are normally attached in this region.
legs - True legs located on the second region of the insect
(pl. uredia) - One of the five reproductive tissues in the complete
rust life cycle. This tissue gives rise to a large number of spores
on a continuous basis for an extended period of time.
- Spores produced in a uredium.
- Any organism that transmits a disease-causing organism.
- Of or relating to the belly; belonging to or situated on or near
the lower surface.
- The uprooting or overturning of trees by the wind.