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ARMILLARIA ROOT ROT: This is a soil borne disease common in parts of the dry-summer western U.S. It infects the roots of many plants, yellowing the leaves, causing wilting and dieback. Signs of infection include pale brown mushrooms growing around the base of the plant and fan-shaped, whitish mold under the bark. Infected plants are hard to save. An arborist may be able to help save large trees. A method of control is to plant resistant species. Also called Oak Root Fungus

BACILLUS: A group of nontoxic bacterial (biological) insecticides. B. thuringiensis var. kurstaki controls caterpillars, such as cabbageworms. B. t. var. San Diego controls Colorado potato beetle; B. t. var. isralensis controls mosquito larvae. B. popilliae, also called milky spore, controls Japanese beetle larvae.

BASAL STEM ROT: Rot is likely to attack plants that have gotten too cold and/or damp, or that have a poor root system. Rot fungus quickly grows from the skin into the tissue, turning them soft and black. Cut off healthy pot plant stems for cuttings and destroy the rest.