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Atrophy The reduction in size of an organ by distributed metabolism. ...

Autoecious The need of only one host for completing the life cycle of a rust. ...

Bacterium (pl. Bacteria) Microscopic one-celled organism. Cell type lacks a distinct nucleus, sexual recombination, and chlorophyll. It does have cell walls and DNA. ...

Bactericide Any chemical or physical agent that kills or protects plants from bacteria. ...

Basidiomycetes A group of fungi characterized by the pro­duction of sexual spores on a club-shaped filament called the basidium. ...

Basidiospore A haploid spore formed externally on a basidium. ...

Basidium (pl. Basidia; adj. Basidial) Short, club-shaped fungus cell on which basidiospores are produced. ...

Blight Any sudden, severe, and extensive spotting, discoloration, or destruction of leaves, flowers, stems, or entire plants, usually attacking young, growing tissues. (In disease names, often coupled with the name of the affected part of the host; e.g., ...

Blotch A blot or spot, usually superficial and irregular in shape and size, on leaves, shoots and fruit. ...

Burn The condition in which the cells of the host become reddish or dark brown and collapse. ...