Proceedings of the 7 th Meeting of IUFRO Working Party 7 . 03 . 04 Diseases and Insects in Forest Nurseries 2010
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چکیده
The Neotropical rust fungus Puccinia psidii, notorious for the severity of its impacts and its broad host range in the family Myrtaceae, is believed to pose the greatest current threat to Hawaii’s forests, including Eucalyptus plantations. Multiple strains of this rust have demonstrated ability to infect different suites of host plants. Only one genotype established in Hawai'i in early 2005 and has not mutated. The addition of new genetic material of P. psidii would increase the likelihood that more species in the Myrtaceae will be seriously affected, most notably Hawaii’s dominant native forest tree 'ōhi'a , Metrosideros polymorpha, which is only moderately damaged by the strain of rust currently in Hawai'i. The potential consequences of a virulent strain of rust on 'ōhi'a forests are immense, due to its role as a foundation tree species and the diversity of niches it fills in Hawai'i. Currently, the State of Hawai'i regulates incoming plant material in the family Myrtaceae by visual inspection, but inspection capacity and latent infections seriously limit the ability to detect the rust. Only complete or near-complete interdiction of Myrtaceae would seem to offer strong protection for Hawaii’s native ecosystems. Prohibition or restriction of the flow of Myrtaceae into Hawai'i could also reduce establishment of numerous invasive insects and pathogens of Myrtaceae, notably for 90 species of non-native Eucalyptus, a potentially important forest resource for Hawaii’s future.
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تاریخ انتشار 2010