Ronald A. Many of our ebooks are available for purchase from these online vendors:. Many of our ebooks are available through library electronic resources including these platforms:. Beautiful and bizarre, plant galls are growths of various shapes, sizes, and colors produced in response to invading organisms. Describing species of galls and their causative agents, Plant Galls of the Western United States explores this unique realm with stunning photos and fascinating information about the life cycles of the organisms involved.
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Worried about plagiarism? Read this. Help Login Sign Up. Gallstones are solid little balls that form in the gall bladder. Gallstones are created when bile substances, cholesterol and bile pigments, mainly,form together and create small odd shaped balls. They are small, dark in color and are made of bilirubin and calcium salts.
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Nursery and greenhouse growers of woody ornamental shrubs, vines, shade trees, fruit trees and herbaceous perennials need to watch for crown gall and take action to eliminate it from their plant material. Agrobacterium tumefaciens is the bacterial pathogen that causes crown gall. Crown gall is well-known as a disease of woody ornamentals and tree fruits, but it can also affect herbaceous perennials Photos 1 and 2. The bacterium typically induces plants to produce an abnormally large number of cells that make up the gall.