Adventitious Roots: Roots that originate from an atypical location such as the stem or leaves.
Cankers: Localized necrotic tissue on the stem, calyx, or penducles of the plant.
Chlorosis: The fading, yellowing or whitening of green tissue due to a decrease in the amount of chlorophyll.
Coalesce: To grow together into one spot.
Cooper Fungicides: Compounds containing copper that are used to kill fungi and bacteria.
Defoliation: Dropping of leaves from the plant.
Disinfect: To kill or prevent the growth of microorganisms (usually disease causing) usually by chemical means.
Distortion: Alteration or changing of the original shape or characteristic of the leaf or leaflets.
Emergence: The point when the seedling shoot first becomes visible through the surface of the soil.
Firing: Browning of the outer edges of the leaflets with a thin yellow band; also referred to as marginal necrosis.
Hydathodes: Leaf openings at the terminus of a vein.
Leaflets: One of the separate divisions of a compound leaf. A compound leaf is made up of several leaflets.
Natural Openings: Openings on the plant that provide a point of entry into the plant by microorganisms.
Necrosis: Death of cells or tissue resulting in browning or blackening of a localized area on the tissue.
Nodes: Points on a stem where the leaves or buds originate.
On-Site Diagnostic Assay: Rapid tests that cab be conducted in the field or the greenhouse.
Pith: Spongy tissue that occupies the center of the stem.
Plant Disease Diagnosis: The science of examining plants to identify their diseases.
Puckering: A disease symptom in which the leaves or leaflets are cupped or pinched into bunches.
Stippling: The appearance of tiny spots.
Stomata: Openings on the leaf surface required for gas exchange.
Streptomycin: An antibiotic produced by the soil bacterium Streptomyces griseus, used to kill bacterial plant pathogens.
Stunting: A disease symptom in which there is a reduction in height due to a reduction in the length of internodes or a decreased in the number of internodes.
Top Wilting: Wilting of shoots on the upper portion of the plant.
Ubiquitous: Present all the time; widespread.
Water-soaked: A disease symptom in which plant tissues or lesions appear wet, dark, and usually sunken and translucent.