DOCSLIB.ORG

Dutch Elm Disease, Oak Wilt and Emerald Ash Borer

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Dutch Elm Disease, Oak Wilt and Emerald Ash Borer Section 1045 - Dutch Elm Disease, Oak Wilt and Emerald Ash Borer Section 1045:00. Declaration of Policy. The City of St. Cloud has determined that the health of elm and oak trees is threatened by the fatal disease known as Dutch Elm and Oak Wilt Diseases. It also has been determined that the health of Ash trees is threatened by an insect pest known as the Emerald Ash Borer. It has been further determined that the loss of elm, and oak and ash trees growing upon public and private property would substantially depreciate the value of property and impair the safety, good order, general welfare and convenience of the public. It is declared to be the intention of the City of St. Cloud to control and prevent the spread of these diseases and insect pests; and this ordinance is intended for this purpose. Section 1045:05. Shade Tree Disease Program. It is the intention of the City of St. Cloud to conduct a program of plant pest control pursuant to authority granted by Minnesota Statutes, Section 18.023 18G.12. This program is directed specifically at the removal of trees stricken with Dutch Elm, or Oak Wilt Disease or Emerald Ash Borer, and is undertaken at the recommendation of the Commissioner of Agriculture and Minnesota State Statutes. The City Forester will act as coordinator for the Commissioner of Agriculture, the City of St. Cloud, and the Department of Parks and Recreation of the City of St. Cloud in the conduct of the program. Section 1045:10. Nuisance Declared. The following items are a public nuisance wherever they are found within the City of St. Cloud: (a) Any living or standing elm tree infected to any degree with Dutch elm disease fungus, ceratocystis ulmi (Buisman) Mureau, or which harbors any elm bark beetles, Scolytus multistrialus (Eich.) or Hylnrgopinus rufipes (March). (b) Any living or standing oak tree infected to any degree with Oak Wilt fungus, Ceratocystis fagacearum. (c) Any living or standing ash tree infested to any degree with Emerald Ash Borer, Agrilus planipennis. (c)(d) Any dead elm, ash or oak tree, including logs, branches, stumps, firewood or other material. from which the bark has not been removed and burned or sprayed with an effective insecticide as often as deemed necessary. Section 1045:11. Exemption. Those portions of the City that are zoned Rural Residential or Agricultural by the St. Cloud Zoning Ordinance are exempt from the application of this Section 1045 of the Code. Section 1045:15. Abatement. It is unlawful for any person to permit any public nuisance as defined in this section to remain on any premises owned by him. Such nuisance will be abated in the manner prescribed by this ordinance. Section 1045:20. Inspection and Investigation. Subd. 1. The Parks Director, his agent or employees assigned to him, may enter upon private premises at any reasonable time for the purpose of carrying out any of the duties assigned in this section. Subd. 2. The Parks Director will inspect all premises and places within the City of St. Cloud as often as practicable to determine whether a nuisance exists. Subd. 3. The Parks Director, upon finding conditions indicating Dutch elm or Oak Wilt infestation, immediately will take appropriate specimens or samples and culture them in a laboratory by an individual authorized by the Commissioner of Agriculture to perform such culture. In the event no one is authorized to perform such culture or the laboratory facilities are unavailable for such purpose, the specimens or samples are to be sent to the Commissioner of Agriculture (Bureau of Plant Industry) State of Minnesota, for analysis or the City Forester will take such other steps for diagnosis as may be recommended by the Commissioner of Agriculture. Subd. 4 Subd. 3 No action to remove infected trees will be taken until positive diagnosis of the disease has been made. Section 1045:25. Abatement of Dutch Elm, Emerald Ash Borer or Oak Wilt Disease Nuisance on City Property. The Parks Director will cause any nuisance, as defined in Section 1045:10, to be removed from property of the City, including streets, boulevards and alley right-of-ways (from property line to property line) and cause same to be burned sanitized or otherwise effectively treated so as to destroy and prevent, as fully as possible, the spread of Emerald Ash Borer, Dutch elm or Oak Wilt disease fungus. The abatement procedures will be carried out in accordance with such technical and expert methods and plans as may be designed by the City of St. Cloud and consistent with the regulations and requirements of the Commissioner of Agriculture of the State of Minnesota. The Park Director will establish procedures for tree removal and disposal methods consistent therewith. Section 1045:30. Abatement of Dutch Elm, Emerald Ash Borer or Oak Wilt Disease Nuisance on Private Property. Whenever the Parks Director finds with reasonable certainty that a nuisance as defined in Section 1045:10 exists on private property, including property controlled by other entities of government and outside any public way or property of the City, within the City of St. Cloud, the City Forester or his authorized representative will notify the owner by certified mail of the existence of the nuisances and direct that the nuisance be removed and burned or otherwise effectively treated in the approved manner within 15 calendar days after mailing of such notice. The notice will also state that if the nuisance is not abated by the owner within the time provided, that the City of St. Cloud will abate the nuisance and assess the costs against the property. In the event the owner of any private or public premises upon which such a nuisance is situated fails to comply with the notice, the Park Director, his agents or employees assigned to him, will proceed to abate the nuisance in the manner prescribed for abatement of such nuisances on City property. Any expenses incurred by the City of St. Cloud or by approved contractors in so doing will be a charge and a lien upon said property and will be collected as a special assessment in the same manner as other special or as stated in Minnesota Statutes Chapter 18G.12. Section 1045:35. Collection of Assessments. The cost of abatement of any nuisance incurred by the City of St. Cloud and not reimbursed by the owner on or before November 1st of each year will be reported by the Parks Director to the City Council, through the Mayor's Office. The Council will assess the levy and cause to be collected the amount of such costs as a special assessment upon and against the premises and property upon which said nuisance existed in like manner as other special assessments, payable in one sum or as stated in Minnesota Statutes, Chapter 18G.12. Section 1045:36. Transporting Elm, Ash and Oak Wood Prohibited. It is unlawful for any person to transport within the City of St. Cloud any bark bearing elm or oak wood without having obtained a permit from the Park Director. Transporting of ash wood is strictly prohibited. Section 1045:40. Interference Prohibited. It is unlawful for any person to prevent, delay or interfere with the Parks Director his agents, employees or contractors, while they are engaged in the performance of duties imposed by this ordinance. Section 1045:45. Position of City Forester. The Parks Director is responsible for the enforcement of this ordinance and to coordinate the abatement program within the rules, regulations and policies set forth by the Commissioner of Agriculture, the Mayor, and the City Council. .
Load more

Recommended publications
  • Bretziella, a New Genus to Accommodate the Oak Wilt Fungus
    A peer-reviewed open-access journal MycoKeys 27: 1–19 (2017)Bretziella, a new genus to accommodate the oak wilt fungus... 1 doi: 10.3897/mycokeys.27.20657 RESEARCH ARTICLE MycoKeys http://mycokeys.pensoft.net Launched to accelerate biodiversity research Bretziella, a new genus to accommodate the oak wilt fungus, Ceratocystis fagacearum (Microascales, Ascomycota) Z. Wilhelm de Beer1, Seonju Marincowitz1, Tuan A. Duong2, Michael J. Wingfield1 1 Department of Microbiology and Plant Pathology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria 0002, South Africa 2 Department of Genetics, Forestry and Agricultural Bio- technology Institute (FABI), University of Pretoria, Pretoria 0002, South Africa Corresponding author: Z. Wilhelm de Beer ([email protected]) Academic editor: T. Lumbsch | Received 28 August 2017 | Accepted 6 October 2017 | Published 20 October 2017 Citation: de Beer ZW, Marincowitz S, Duong TA, Wingfield MJ (2017) Bretziella, a new genus to accommodate the oak wilt fungus, Ceratocystis fagacearum (Microascales, Ascomycota). MycoKeys 27: 1–19. https://doi.org/10.3897/ mycokeys.27.20657 Abstract Recent reclassification of the Ceratocystidaceae (Microascales) based on multi-gene phylogenetic infer- ence has shown that the oak wilt fungus Ceratocystis fagacearum does not reside in any of the four genera in which it has previously been treated. In this study, we resolve typification problems for the fungus, confirm the synonymy ofChalara quercina (the first name applied to the fungus) andEndoconidiophora fagacearum (the name applied when the sexual state was discovered). Furthermore, the generic place- ment of the species was determined based on DNA sequences from authenticated isolates. The original specimens studied in both protologues and living isolates from the same host trees and geographical area were examined and shown to represent the same species.
    [Show full text]
  • NEW HAMPSHIRE OAK WILT RESPONSE PLAN Division of Forests and Lands and Partners
    NEW HAMPSHIRE OAK WILT RESPONSE PLAN Division of Forests and Lands and Partners 2020 Table of Contents A. Background…………………………………………………………………………………………………………….. 1 1. Disease description…………………………………………………………………………………………… 1 2. Origin……………………………………………………………………………………………………............. 1 3. Potential economic impact………………………………………………………………………………. 1 4. Mode of spread……………………………………………………………………………………………….. 2 B. Survey and Detection…………………………………………………………………………………………….. 3 1. Aerial……………………………………………………………………………………………………………….. 3 2. Ground…………………………………………………………………………………………………………….. 3 3. Sampling and testing……………………………………………………………………………………….. 3 4. Reporting…………………………………………………………………………………………………………. 3 C. Outreach………………………………………………………………………………………………………………… 4 1. FPAG…………………………………………………………………………………………………………………. 4 2. NHbugs.org………………………………………………………………………………………………………. 4 3. Press Release……………………………………………………………………………………………………. 4 4. Workshops……………………………………………………………………………………………………….. 5 D. Control Areas…………………………………………………………………………………………………………. 6 1. Authority………………………………………………………………………………………………………. 6 2. Delimiting boundary…………………………………………………………………………………….. 6 3. Treatment requirements………………………………………………………………………………. 7 E. Slow the spread……………………………………………………………………………………………………… 8 1. Site Monitoring………………………………………………………………………………………………… 8 2. Pruning standards…………………………………………………………………………………………….. 8 Background Disease Description “Oak wilt” is the common name for Bretziella fagacearum, (formerly Ceratosystis fagacearum) a fungal pathogen known to infect all oak tree species.
    [Show full text]
  • Diagnosis of Phytophthora Ramorum in Trees
    Diagnosis of PhytophthoraPhytophthora ramorumramorum in Trees by Dr. Kim D. Coder, Warnell School of Forest Resources, University of Georgia April, 2004 The organism shown to be responsible for SOD (sudden oak death) is Phytophthora ramorum, a fungus / yeast-like brown algae. This pathogen generates a number of symptoms in the trees infected. Of the trees and large shrubs shown to be infectable with this pathogen, some species have more serious stem and branch lesions like oaks, while other species have primarily leaf and twig lesions. In a single landscape, multiple hosts can keep the pathogen present for further attacks. This publication was prepared by reviewing approximately 35 research or disease announcement publications in Europe and North America. In addition, a number of factsheets and synthesized informa- tion guides were reviewed for continuity. This publication is designed for field diagnosis of SOD-like symptoms and related symptom sets on community trees. This publication should not be used in tree nursery situations, and is not a pathogen centered review. It is critical to seek pathological expertise and testing for confirming disease organism presence. A selected bibliography is available entitled “Sudden Oak Death – SOD: Bibliography of Important Literature.” (Coder, Kim D. 2004. University of Georgia, Warnell School of Forest Resources outreach publication SFR04-1. 2pp.). Names The tree syndrome or symptom set which characterizes attack by Phytophthora ramorum has common names of “ramorum dieback,” “ramorum blight,” “ramorum twig blight,”“ramorum leaf blight,” “ramorum stem canker,” “blood spot disease,” or “sudden oak death” (SOD). Phytophthora ramorum, and the less virulent Phytophthora nemorosa and Phytophthora pseudosyringae are all relatively new pathogen species recovered from trees which show ramorum blight symptoms.
    [Show full text]
  • Diseases of Trees in the Great Plains
    United States Department of Agriculture Diseases of Trees in the Great Plains Forest Rocky Mountain General Technical Service Research Station Report RMRS-GTR-335 November 2016 Bergdahl, Aaron D.; Hill, Alison, tech. coords. 2016. Diseases of trees in the Great Plains. Gen. Tech. Rep. RMRS-GTR-335. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 229 p. Abstract Hosts, distribution, symptoms and signs, disease cycle, and management strategies are described for 84 hardwood and 32 conifer diseases in 56 chapters. Color illustrations are provided to aid in accurate diagnosis. A glossary of technical terms and indexes to hosts and pathogens also are included. Keywords: Tree diseases, forest pathology, Great Plains, forest and tree health, windbreaks. Cover photos by: James A. Walla (top left), Laurie J. Stepanek (top right), David Leatherman (middle left), Aaron D. Bergdahl (middle right), James T. Blodgett (bottom left) and Laurie J. Stepanek (bottom right). To learn more about RMRS publications or search our online titles: www.fs.fed.us/rm/publications www.treesearch.fs.fed.us/ Background This technical report provides a guide to assist arborists, landowners, woody plant pest management specialists, foresters, and plant pathologists in the diagnosis and control of tree diseases encountered in the Great Plains. It contains 56 chapters on tree diseases prepared by 27 authors, and emphasizes disease situations as observed in the 10 states of the Great Plains: Colorado, Kansas, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, and Wyoming. The need for an updated tree disease guide for the Great Plains has been recog- nized for some time and an account of the history of this publication is provided here.
    [Show full text]
  • Oak Wilt Fact Sheet
    OAK WILT A Disease of Oak Trees ▐ What is oak wilt? Oak wilt is a disease that affects oak trees. It is caused by Ceratocystis fagacearum, a fungus that develops in the xylem, the water-carrying cells of trees. All oaks are susceptible to the fungus, but the red oak group (with pointed leaf tips) often die much faster than white oaks (rounded leaf tips). ▐ Why is oak wilt a problem? The oak wilt fungus blocks the flow of water and nutrients from the roots to the crown, causing the leaves to wilt and fall off, usually killing the tree. Red oaks (scarlet oak, pin oak, black oak, etc.) can die within a few weeks to six months, and the disease spreads quickly from tree to tree. White oaks (bur oak, scrub oak, etc.), however, often take years to die and the disease usually cannot spread to additional trees. ▐ Where does it come from? Oak tree killed by oak wilt Oak wilt was first discovered in Wisconsin in 1944, but where it originated is still unknown. It has spread throughout the Midwest and Texas, killing tens of thousands of trees. ▐ Where has it been found in New York State? In 2008, a small infection was discovered in Glenville, NY. It was quickly dealt with to prevent further spread. The disease resurfaced in the same location in 2013, and additional steps were taken to eradicate the infection. In 2016, oak wilt was discovered in Islip, Riverhead, and Southold in Suffolk County; Brooklyn in Kings County; and Canandaigua in Ontario County. ▐ How does it spread? There are two main ways oak wilt is spread: 1) above ground by beetles, and 2) below ground through tree roots.
    [Show full text]
  • OAK WILT an Invasive Pathogen on Connecticut’S Doorstep!
    OAK WILT An Invasive Pathogen on Connecticut’s Doorstep! P. Kurzeja, Forest Health Division, Michigan D. N. R. What is it? Trees at risk: Where is it? Oak wilt is a vascular disease of oak All oak species are susceptible and at risk. Oak wilt has spread throughout trees, caused by the fungus Bretziella The red oak group (red, black, pin) is the the Eastern United States. Since (formerly Ceratocystic) fagacearum. The most susceptible, with mortality frequently first identification in NY State, fungus grows on the outer sapwood occurring within one growing season. Oaks oak wilt has been confirmed in of oak trees restricting the flow of in the white oak group (white, bur) are also numerous locations in Brooklyn and water and nutrients through the tree. affected but are more resistant. Long Island. Signs and Symptoms: Impacts: • Leaves turn dull green, brown or • Impacts property values and yellow neighborhood aesthetics • Discoloration of leaves • Increased costs with tree progressing from the edge of maintenance, removal and the leaf to the middle replacement • Wilting and bronzing of foliage • Loss of a valued shade tree starting at top of the tree and • Negative impacts to the forestry moving downwards industry and production of high • Premature leaf drop (including value oak products green leaves) • Reduction in food source for • White, grey or black fungal mats forest animals provided by oak just under the bark that emit a trees fruity smell • Loss of habitat for some species • Vertical bark cracks in the trunk • Reduction of ecological services and large branches as a result of (air and water filtering) the fungal spore mats (also Invasive Species Centre D.W.
    [Show full text]
  • This Article Is from the August 2011 Issue of Published by the American
    This article is from the August 2011 issue of published by The American Phytopathological Society For more information on this and other topics related to plant pathology, we invite you to visit APSnet at www.apsnet.org Oak wilt, caused by the fungus Ceratocystis fagacearum (Bretz) Taxonomy, Occurrence, and Significance of Oaks J. Hunt, is an important disease of oaks (Quercus spp.) in the east- Quercus (Family Fagaceae), commonly referred to as oaks, is a ern United States. It has been particularly destructive in the North large genus of trees and shrubs, containing over 400 species world- Central states and Texas. Oak wilt is one of several significant oak wide (67). Relative to the expansive worldwide distribution of diseases that threaten oak health worldwide. The significant gains oaks, oak wilt is known to occur only in part of its potential range made in our knowledge of the biology and epidemiology of this in the United States. Further, C. fagacearum is pathogenic only to vascular wilt disease during the past six decades has led to devel- certain groups within the large variety of oak species. With the opment of various management strategies. exception of Lithocarpus, differences in the fruit (acorns) of Quer- Interest in oak wilt research and management has “waxed and cus spp. serve to distinguish the oaks from other taxa in the Fa- waned” since the pathogen was initially discovered in the early gaceae (the beech family) (67). Taxonomically, Quercus currently 1940s (61). This ambivalence, accompanied by emphasis on newly is divided into four sections: Section Cerris with species in Asia, emerging oak diseases such as sudden oak death (107) and Raf- Europe, and the Mediterranean; Section Lobatae, or red oaks, faelea-caused wilt of oaks in Japan and Korea (82,83), could have found only in the Americas; Section Quercus, or white oaks, with very costly consequences.
    [Show full text]
  • Oak Wilt in Wisconsin's Forests
    Oak Wilt in Wisconsin’s Forests Biology, Symptoms and Management FOREST HEALTH FACTSHEET Wisconsin Department of Natural Resources, Division of Forestry, Forest Health Program, Revised January 2021 LOCATIONS IMPACT to nearby oak trees through ak wilt is a deadly disease Oak wilt kills thousands of trees interconnected (grafted) root Othat affects oak trees. First each year in forests, woodlots and systems, creating an expanding documented in 1944, oak wilt urban areas. Oak wilt can even pocket of dead oak trees. has since been confirmed in most attack and kill healthy trees. The of Wisconsin’s counties (Figure disease is a particularly serious IDENTIFICATION 1). Oak wilt is widespread and problem for species in the red oak Leaves will wilt and drop from the common throughout central and group such as northern red, north- upper canopy first. Symptoms southern Wisconsin; however, ern pin and black oaks. Once wilt- progress down the tree rapidly the disease is still uncommon in ing symptoms are apparent on a (Figure 4). northern Wisconsin (Figure 2). red oak, the infected tree will lose most of its leaves and die within approximately one month. Among the white oak group, bur and swamp white oaks demonstrate moderate tolerance to the disease; living several years after symptoms first appear. White akso experience even slower disease progression and may survive infection. BIOLOGY Oak wilt is caused by the fungus Bretziella fagacearum. The fungus Figure 3: Fungal mats produce oak wilt spores grows through the infected tree’s Figure 1: County distribution of oak wilt in and grow underneath the bark of trees killed by the Wisconsin water conducting system, causing disease.
    [Show full text]
  • Plant Pathology Journal
    NETWORK FOR SCIENTIFIC INFORMATION - Volume 4 Number 2 July, 2005 PPJ PLANT PATHOLOGY JOURNAL Plant Pathology Journal 4 (2): 177- 19 1, 2005 ISSN 18 12-5387 92005 Asian Netcvork for Scientific Information Recent Advances in the Control of Oak Wilt in the United States A. Dan Wilson Souther11 Hardwoods Laboratory, Department of Agriculture, Forest Service, Forest Insect and Disease Research, Southern Research Station, Center for Bottomland Hardwoods Research, P.O. Box 227, Stoneville, Mississippi 38776-0227, USA Abstract: Oak wilt, caused by Ceratocystzsfagacearum (T.W. Bretz) J. Hunt, is probably the most destructive disease of oak trees (Quercus species) in the United States, and is currently causing high mortality at epiphytotic proportions in central Texas. The serious potential for damage prompted an increase in federal funding within the past fifteen years for new oak wilt research. New research developments have included adaptive utilizations of industrial technologies such as Electronic Aroma Detection (EAD) and aerial infrared remote sensing surveys for early disease detection and diagnosis, geotextile polymeric landscape fabrics etc. All of these areas of increased knowledge have contributed to and provided means for improving oak wilt suppression in a more effective and integrated way. The development of these improved methods for oak wilt control are reviewed here and discussed in relation to current state forestry pest-control programs that have begun to i~nplementthese new methods in their oak wilt suppression operations. Key words: Ceratocystis,fugacearur~z,disease suppression, microinjectors, trench inserts, triazole fungicides INTRODUCTION semievergreen live oaks, Quercusfusiformis Slnall (plateau live oak) and Quercus virginiana Miller (coastal live oak), Oak wilt, caused by Ceratocystis fagacear~unz are considered the most valuable woodland and urban (T.W.
    [Show full text]
  • How to Identify, Prevent, and Control Oak Wilt
    How To Identify, Prevent, and Control Oak Wilt United States Forest Service Northeastern Area Department of State & Private Agriculture Forestry NA–FR–01–11 Authors Joseph G. O’Brien, Plant Pathologist USDA Forest Service Northeastern Area State and Private Forestry Forest Health Protection Manfred E. Mielke, Forest Health Specialist USDA Forest Service Northeastern Area State and Private Forestry Forest Health Protection Dale Starkey, Plant Pathologist USDA Forest Service Southern Region Forest Health Protection Jennifer Juzwik, Research Plant Pathologist USDA Forest Service Northern Research Station Illustrators Julie Martinez, Scientific Illustrator Minneapolis, Minnesota Juliette Watts, Scientific Illustrator Newtown Square, Pennsylvania Acknowledgments The authors thank Dr. Frank Tainter and Dr. David Appel for their reviews of the manuscript. We are also grateful to Steve Cook, Steve Kunde, Linda Haugen, and Jill Pokorny for helpful suggestions concerning content and to Roberta Burzynski and Sandy Clark for editing the manuscript and Deb Muccio for design and layout. How To Identify, Prevent, and Control Oak Wilt United States Department of Agriculture Forest Service Northeastern Area State and Private Forestry NA–FR–01–11 Newtown Square, PA August 2011 www.na.fs.fed.us Pesticide Precautionary Statement: CAUTION: Pesticides used improperly PESTICIDES can be injurious to humans, animals, and plants. Follow the directions and heed all precautions on the labels. Store pesticides in original containers—out of reach of children and pets—and away from foodstuffs. Apply pesticides selectively and carefully. Do not apply a pesticide when there is danger of drift to other areas. Avoid prolonged inhalation of a pesticide spray or dust. When applying a pesticide it is advisable that you be fully clothed.
    [Show full text]
  • Invertebrate Assemblages on Biscogniauxia Sporocarps on Oak Dead Wood: an Observation Aided by Squirrels
    Article Invertebrate Assemblages on Biscogniauxia Sporocarps on Oak Dead Wood: An Observation Aided by Squirrels Yu Fukasawa Graduate School of Agricultural Science, Tohoku University, 232-3 Yomogida, Naruko, Osaki, Miyagi 989-6711, Japan; [email protected]; Tel.: +81-229-847-397; Fax: +81-229-846-490 Abstract: Dead wood is an important habitat for both fungi and insects, two enormously diverse groups that contribute to forest biodiversity. Unlike the myriad of studies on fungus–insect rela- tionships, insect communities on ascomycete sporocarps are less explored, particularly for those in hidden habitats such as underneath bark. Here, I present my observations of insect community dynamics on Biscogniauxia spp. on oak dead wood from the early anamorphic stage to matured teleomorph stage, aided by the debarking behaviour of squirrels probably targeting on these fungi. In total, 38 insect taxa were observed on Biscogniauxia spp. from March to November. The com- munity composition was significantly correlated with the presence/absence of Biscogniauxia spp. Additionally, Librodor (Glischrochilus) ipsoides, Laemophloeus submonilis, and Neuroctenus castaneus were frequently recorded and closely associated with Biscogniauxia spp. along its change from anamorph to teleomorph. L. submonilis was positively associated with both the anamorph and teleomorph stages. L. ipsoides and N. castaneus were positively associated with only the teleomorph but not with the anamorph stage. N. castaneus reproduced and was found on Biscogniauxia spp. from June to November. These results suggest that sporocarps of Biscogniauxia spp. are important to these insect taxa, depending on their developmental stage. Citation: Fukasawa, Y. Invertebrate Keywords: fungivory; insect–fungus association; Sciurus lis; Quercus serrata; xylariaceous ascomycetes Assemblages on Biscogniauxia Sporocarps on Oak Dead Wood: An Observation Aided by Squirrels.
    [Show full text]
  • OAK WILT TREATMENTS - EXAMINING the FACTS by Mark Duff - Texas Forest Service Dr
    OAK WILT TREATMENTS - EXAMINING THE FACTS By Mark Duff - Texas Forest Service Dr. David Appel- Texas A&M University Over the past few years, claims have been made that oak wilt can be cured or prevented by maintaining vigorous and healthy oaks. One of the most popular claims is that, by keeping trees in a healthy condition, their "immune systems" will be "boosted" and therefore the trees will "resist" being infected and killed by the pathogen that causes oak wilt. A variety of products, ranging from water to organic concoctions to fertilizers, have been recommended to keep oak trees disease resistant. The best way to assess the validity of these claims is by examining the facts about oak wilt, tree health, and immunity. Webster's Dictionary defines immune as, "Having or producing antibodies or lymphocytes capable of reacting with a specific antigen." The indices of some of the most popular college textbooks on plant pathology, plant physiology, arboriculture, botany and plant biology, make not a single reference to antibodies, lymphocytes, or antigens in plants. However, every undergraduate animal biology textbook, and other sources such as the Mayo Clinic webpage, is filled with references on human immunology. Simply put, immunity in the sense of a antigen / antibody response is a phenomenon exclusive to the animal kingdom. For example, animals can be injected with a weakened or dead flu virus in order to prevent them from developing flu symptoms. The vaccine does not make the animal sick, but it introduces the immune system to the flu virus. Memory cells are then placed on guard, and are ready to produce antibodies when and if the full-blown flu virus challenges the animal.
    [Show full text]