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Phytophthora multivora is a species of Oomycete, water moulds, identified as a plant pathogen implicated in dieback. [1] It was first isolated in tuart forest of Southwest Australia in a study of the decline of tuart Eucalyptus gomphocephala , jarrah Eucalyptus marginata , peppermint Agonis and banksia species.
Phytophthora cactorum has an extremely wide host range, and can infect over 200 species or 160 genera of trees, ornamentals, and fruit crops. [2] In general, P. cactorum is capable of infecting both young and old plants, and causes root rots and crown rots of the many genera it infects. Although the symptoms this pathogen produces varies ...
Rhododendron ponticum showing classic symptoms of Phytophthora kernoviae in the UK. Phytophthora (from Greek φυτόν (phytón), "plant" and φθορά (phthorá), "destruction"; "the plant-destroyer") is a genus of plant-damaging oomycetes (water molds), whose member species cause economic losses on crops worldwide, as well as environmental damage in natural ecosystems.
Since 2003, Phytophthora kernoviae has caused marked damage to ornamentals and species of trees in the Southwest United Kingdom. The oomycete pathogen was first discovered in the 1990s, yet only gained widespread attention when it was identified as one of the causal agents, along with P. ramorum, of sudden oak death . [ 16 ]
Phytophthora lateralis is a soil-borne plant pathogen that causes cedar root disease in Port Orford cedars (Chamaecyparis lawsoniana). This pathogen was first noted to cause disease in around 1920 on nursery stock near Seattle .
Phytophthora quercina is a soil-borne pathogen and has a polycyclic disease cycle. Its spores and structures vary in size, shape, and appearance. The pathogen may survive in the soil in unfavorable conditions as chlamydospores that are spherical in shape, but they are not produced consistently even when conditions are unfavorable for survival.
Eucalyptus may have adverse effects on local streams due to their chemical composition, and their dominance threatens species that rely on native trees. Nevertheless, some native species have been known to adapt to the Eucalyptus trees. Notable examples are herons, great horned owl, and the monarch butterfly using Eucalyptus groves as habitat ...
Phytophthora ramorum is the oomycete known to cause the disease sudden oak death (SOD).The disease kills oak and other species of trees and has had devastating effects on the oak populations in California and Oregon, as well as being present in Europe.