Term
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Definition
-Harm or injury
-Progressive |
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Term
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Definition
-Abiotic (nonliving)
-Biotic (living) |
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Term
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Definition
Disease
-Susceptible Plant (top)
-Conducive environment (bottom)
-Time (right)
-Virulent Pathogen (left) |
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Term
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Definition
| Expressions of disease by a plant -Stunting -Chlorosis -Necrosis |
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Term
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Definition
-a parasite that causes harm
-infectious |
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Term
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Definition
| -obtains nutrients from another living organism -not necessarily a pathogen |
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Term
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Definition
| -one that is entirely dependent upon a host for its survival. -can't be grown artificially |
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Term
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Definition
| -capable of changing life-style, e.g. from saprophytic (nourish. from nonliving) to parasitic (nourish. from living) or the reverse |
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Term
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Definition
| a living plant attacked by or harboring a parasite or pathogen and from which the invader obtains part or all of its nourishment. |
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Term
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Definition
| an organism that obtains nourishment from nonliving organic matter |
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Term
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Definition
| an organism that can live and multiply only on another living organism (see also obligate parasite) contrasts with necrotroph) |
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Term
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Definition
| a parasite that typically kills host cells and obtains its energy from them (contrasts with biotroph) |
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Term
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Definition
| having one disease or life cycle per growing season |
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Term
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Definition
| having several to many disease cycles in a growing season (contrasts with monocyclic) |
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Term
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Definition
| a male sexual organ (male gametangium) found in some fungi and funguslike organisms |
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Term
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Definition
| the female gametangium of members of the Oomycota (the oomycetes), containing one or more gametes |
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Term
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Definition
| a thick-walled, sexually-derived resting spore of the Oomycota (the oomycetes) |
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Term
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Definition
| a saclike structure in which the entire contents are converted into an indefinite number of asexual spores in certain fungi and funguslike organisms |
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Term
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Definition
| a spore of a fungus or funguslike organism with flagella, capable of locomotion in water |
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Term
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Definition
| a hypha resulting from an outgrowth of the spore wall and cytoplasm after germination |
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Term
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Definition
| a specialized branch of a parasite formed inside host cells to absorb nutrients |
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Term
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Definition
| having a single complete set of chromosomes (1N chromosomes) (contrasts with dikaryotic, diploid, polyploid) |
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Term
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Definition
| having two sexually compatible haploid nuclei per cell, that divide simultaneously; this phase is called the dikaryophase (contrasts with haploid, diploid, polyploid) |
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Term
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Definition
| having two complete sets of chromosomes (2N chromosomes) (contrasts with haploid, dikaryotic, polyploid) |
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Term
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Definition
| a single, tubular filament of a fungal thallus or mycelium; the basic structural unit of a fungus |
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Term
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Definition
| the sexual form in the life cycle of a fungus (see also perfect state) (contrasts with anamorph, holomorph, imperfect state) |
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Term
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Definition
| the vegetative body of a fungus or a "simple plant," such as a moss |
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Term
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Definition
| the whole fungus in all its states (contrasts with anamorph, imperfect state, perfect state, teleomorph) |
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Term
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Definition
| the asexual form in the life cycle of a fungus, when asexual spores (such as conidia) or no spores are produced (see also imperfect state) (contrasts with holomorph, teleomorph, perfect state) |
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Term
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Definition
| the failure of chlorophyll development, caused by disease or a nutritional disturbance; fading of green plant color to light green, yellow, or white |
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Term
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Definition
| having multiple nuclei embedded in cytoplasm without cross walls (see also aseptate; nonseptate) (contrasts with septate) |
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Term
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Definition
| a spherical (or near-spherical) bacterial cell |
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Term
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Definition
| an asexual, nonmotile fungal spore that develops externally or is liberated from the cell that formed it |
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Term
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Definition
| a group of fungi that produce sexual spores (ascospores) within a saclike structure called an ascus; ascomycetes; sac fungi |
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Term
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Definition
| a group of fungi that produce sexual spores (basidiospores) externally on a structure called a basidium; basidiomycetes; mushroom fungi |
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Term
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Definition
| a group of funguslike organisms - typically with nonseptate mycelia, asexual sporangia and zoospores, and sexual oospores - in the kingdom Stramenopila (or Straminipila); oomycetes |
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Term
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Definition
| the procedure used to prove the pathogenicity of an organism, i.e., its role as the causal agent of a disease |
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Term
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Definition
1. Observe consistent association between host & pathogen
2. isolate & characterize cause
3. inoculate healthy host w/ pathogen & produce same disease
4. isolate & characterize pathogen & confirm same pathogen |
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Term
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Definition
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Term
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Definition
| Multicellular forms having cellulose cell walls and capable of photosynthesis by means of chlorophyll |
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Term
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Definition
| the fusion of 2 sex cells |
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Term
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Definition
| the curved, apical portion of a blighted stem (see also crozier) |
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Term
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Definition
Pathogen: Venturia inaequalis
Hosts: Apples, hawthorn, firethorn, mountain ash
Signs/Symptoms: Blistered lesions on fruit/underside leaves
Management: Chemical fungicides (preventative/curative)
Cultivars (Enterprise, Freedom, G. Rush
Cultural Practices such as pruning to allow
air flow & sunlight |
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Term
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Definition
| sexual reproduction can occur only in the presence of genetically different mycelia (contrasts with homothallism) |
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Term
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Definition
| sexual reproduction occurs with a single thallus; self-fertile (contrasts with heterothallism) |
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Term
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Definition
| an indication of disease from direct observation of a pathogen or its parts (contrasts with symptom) |
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Term
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Definition
| an archaic term for a group of fungi without a sexual stage; the asexual stage of members of Ascomycota (the ascomycetes) and Basidiomycota (the basidiomycetes) (see also Fungi Imperfecti, imperfect fungi) |
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