Phytophthora Infestations in Forest Ecosystems

Phytophthora Infestations in Forest Ecosystems PDF

Author: Bruno Scanu

Publisher: MDPI

Published: 2021-06-02

Total Pages: 216

ISBN-13: 3036508007

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The oomycete genus Phytophthora represents one of the most notorious groups of tree pathogens in natural and semi-natural forest ecosystems. Since the discovery in the 1960s of the invasive P. cinnamomi, threatening some of the world’s richest plant communities in Australia, numerous Phytophthora diseases have been reported on forest trees worldwide, which were previously unknown to science. The most notable examples include the oak and beech declines triggered by different Phytophthora spp. in Europe and North America, the findings of sudden oak death and sudden larch death caused by P. ramorum in the Western USA and the U.K., respectively, and the association of P. austrocedri with mal del ciprés in Argentina and juniper decline in the U.K. All these epidemic events are driven by exotic invasive Phytophthora species, introduced through infested nursery plants from their native overseas environments. In recent years, many independent surveys have studied the diversity of Phytophthora species and the diseases they are causing across a diverse range of forests and other natural ecosystems. This Special Issue presents papers on Phytophthora surveys performed in different biogeographic regions and addresses the pathways, and ecological and economic impacts of these invasive forest pathogens.

Phytophthora Infestations in Forest Ecosystems

Phytophthora Infestations in Forest Ecosystems PDF

Author: Bruno Scanu

Publisher:

Published: 2021

Total Pages: 216

ISBN-13: 9783036508016

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The oomycete genus Phytophthora represents one of the most notorious groups of tree pathogens in natural and semi-natural forest ecosystems. Since the discovery in the 1960s of the invasive P. cinnamomi, threatening some of the world's richest plant communities in Australia, numerous Phytophthora diseases have been reported on forest trees worldwide, which were previously unknown to science. The most notable examples include the oak and beech declines triggered by different Phytophthora spp. in Europe and North America, the findings of sudden oak death and sudden larch death caused by P. ramorum in the Western USA and the U.K., respectively, and the association of P. austrocedri with mal del ciprés in Argentina and juniper decline in the U.K. All these epidemic events are driven by exotic invasive Phytophthora species, introduced through infested nursery plants from their native overseas environments. In recent years, many independent surveys have studied the diversity of Phytophthora species and the diseases they are causing across a diverse range of forests and other natural ecosystems. This Special Issue presents papers on Phytophthora surveys performed in different biogeographic regions and addresses the pathways, and ecological and economic impacts of these invasive forest pathogens.

Invasive Forest Pests

Invasive Forest Pests PDF

Author:

Publisher: Nova Publishers

Published: 2007

Total Pages: 114

ISBN-13: 9781600214615

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Evidence suggests that efforts to eradicate the Asian long-horned beetle appear likely to succeed, while the emerald ash borer and P. ramorum are likely to continue to infest and damage forest ecosystems indefinitely despite efforts to control them. The Asian long-horned beetle is a wood-boring insect from Asia that has caused separate infestations in parts of New York, New Jersey, and Illinois. Over 8,000 trees infested with the beetle have been removed, and over 600,000 trees have been chemically treated to protect against the beetle. As a result of these and other actions, federal and state agencies have been able to reduce the size of the infested areas. The emerald ash borer is also a wood-boring insect from Asia that has infested large areas in Michigan; Ohio; Indiana; and Ontario, Canada, killing an estimated 15 million trees. The pathogen P. ramorum is the causal agent of the disease known as Sudden Oak Death. It is of unknown origin and has infested large areas in central and northern coastal California and a small area in southern Oregon. This book examines these key environmental issues. This book is a fully-indexed excerpted version of a GAO report.

Invasive Forest Pests

Invasive Forest Pests PDF

Author:

Publisher:

Published: 2007

Total Pages: 13

ISBN-13:

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Invasive forest pests have seriously harmed our environment and imposed significant costs on our economy. The U.S. Department of Agriculture (USDA) is the lead agency for responding to forest pests and coordinates with the Department of Homeland Security (DHS) to prevent pests from entering the country. GAO issued two reports in 2006 on these programs. This testimony describes (1) the status of USDA's efforts to eradicate the Asian longhorned beetle, emerald ash borer, and Phytophthora ramorum; (2) the factors affecting the success of those eradication efforts; and (3) areas of continued vulnerability in regard to preventing the arrival and spread of forest pests. On the basis of the available evidence, it appears that the Asian longhorned beetle will be eradicated in the three states that have infestations, although funding reductions have extended the likely completion date. In contrast, the emerald ash borer and P. ramorum--the pathogen that causes Sudden Oak Death--are likely to continue to infest and damage forest ecosystems in the Midwest and on the West Coast, despite efforts to control them. The success of the federal responses to these infestations has been affected by several factors. First, the unique biological characteristics of each species greatly influences the ability to effectively control them. Second, quarantines have helped contain the spread of the pests, but implementing and enforcing quarantines has been difficult. Third, the only available method for eradicating these pests is to destroy infested trees and plants--a costly and sometimes impractical approach. Fourth, despite budgeting over $420 million to control these three pests, USDA program managers told GAO that funding has not been sufficient to fully implement their programs. We also found that USDA had not adequately prepared up-to-date management plans to provide decision makers and the public with current information on the extent of the infestation, eradication goals, and long-term funding needs. We identified areas of vulnerability that we believe increase the risk of future forest pest infestations. Specifically, we found that despite efforts to expand USDA's forest health monitoring programs, they do not adequately provide for comprehensive monitoring in urban forests or other locations considered at high risk from pest invasions. Monitoring in such areas is important because they are common destination points for internationally traded cargo, which is a frequent pathway for pests. Improvements could help prevent situations such as those experienced with the Asian longhorned beetle, the emerald ash borer, and P. ramorum, in which years of delay in detection allowed them to become established before control programs began. In our report on port inspections, we found that DHS has not used a risk-based staffing model to assign newly hired agricultural specialists to ports of entry. As a result, DHS does not have assurance that staff are assigned to areas of greatest vulnerability. In addition, despite an interagency agreement intended to facilitate coordination between DHS and USDA, agricultural specialists are not consistently receiving notifications of changes to policies and urgent inspection alerts in a timely manner. We also reported that DHS has allowed the canine inspection program--dogs trained to locate items that might harbor pests--to deteriorate. Dozens of canine units are vacant, and the proficiency scores of the remaining canine units have declined.

Forest Pathology and Plant Health

Forest Pathology and Plant Health PDF

Author: Matteo Garbelotto

Publisher: MDPI

Published: 2018-04-13

Total Pages: 243

ISBN-13: 3038426717

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This book is a printed edition of the Special Issue "Forest Pathology and Plant Health" that was published in Forests

Forest Pathology and Entomology

Forest Pathology and Entomology PDF

Author: Salvatore Moricca

Publisher: Mdpi AG

Published: 2021-12-29

Total Pages: 330

ISBN-13: 9783036526591

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The 22 papers that make up this Special Issue deal with pathogen and pest impact on forest health, from the diagnosis to the surveillance of causative agents, from the study of parasites' biological, epidemiological, and ecological traits to their correct taxonomy and classification, and from disease and pest monitoring to sustainable control strategies.