Fertilizer applications. After honey fungus, Phytophthora root rot is the most common cause of root and stem base decay of a wide range of trees and shrubs. Cause Phytophthora spp., a water mold, fungus-like microorganism. The culprit: Phytophthora root rot, a water mold that, once in the soil, makes it unfit for production. By then, unfortunately, the damage has already been done. Despite the name, "root rot," gardeners usually spot signs of the disease in the plant's leaves, not its roots. plants coming in contact with roots in which the fungus is active. Circular area of alfalfa killed by Phymatotrichum root rot. Plants most susceptible to Armillaria root rot are those under stress from prolonged drought, repeated insect defoliation, root injury, or recent transplanting. This cuts off water and nutrient supply to the crown, causing tree death. Root rot is commonly a replant problem. Infection takes place by roots of susceptible plants coming in contact with roots in which the fungus is active. Height: 20 - 30 feet. Procerum root rot appears to be associated with trees and shrubs planted in heavy, wet, poorly drained soils. CHEMICAL CONTROL Use chlorothalonil, copper, or mancozeb (protectants); or alternate with … Phytophthora root and crown rots (sometimes called collar rot) are common and destructive diseases of fruit trees throughout the world. Shrubberies, woody ornamental species and some fruit-bearing cultivars are its most common hosts. Photo by H.J. Windthrow may take place. A number of candidates exist for the title of most durable, rot-resistant tree. Almost all fruit and nut trees, as well as most ornamental trees and shrubs (including many California natives), can develop Phytophthora rot if soil around the base of the plant remains wet for prolonged periods, or when planted too deeply. Not quite as resistant as these, but still defined as resistant or very resistant, according to the FPL, are more common woods that are widely sold for outdoor use: various species of cedar, cypress, redwood, and white oak. The fungus, Armillaria mellea, occurs sporadically in this region and has been reported to infect over 25 species of ornamental trees and shrubs.The most distinctive sign of Armillaria infection is the honeycolored mushroom that grows from the roots and base of plants. Trees that are infected with Cotton Root Rot should be removed and only planted with tolerant or resistant plant species. Brown root rot disease is caused by the fungus Phellinus noxius. Phytophthora root rot is a serious fungal infection that attacks many types of vegetation. Resistant to Texas root rot. 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