Rust Diseases

By The Old House Web

Rust Diseases

List of files and visuals associated with this text.

Rusts are diseases caused by a complex group of fungi. The fungi produce spores in pustules that break through the plant epidermis. The spores are generally reddish brown, orange red to orange, and dry and dusty. Many plants, from grasses to pine trees, get rust diseases. A common experience is to walk through tall grass infected with rust and emerge with shoes coated in orange-red spores.

The rust diseases produce several different spores, each spore capable of infecting a different plant. The cedar-apple rusts are a good example. Spores formed in galls on cedar infect apple leaves, causing leaf spots. Spores formed on apple leaves infect only the cedar needles, causing galls. Rusts generally infect healthy, vigorous plants in preference to weak plants.

Visuals associated with this text.

Visual title - Visual size Visual title - Visual size
White pine blister rust - 40K White pine blister rust, mature canker - 48K
White pine blister rust, twig swellings - 33K White pine blister rust on gooseberry - 30K
White pine blister rust - 24K White pine blister rust - 42K
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