Hypoxylon mammatum

  1. 2 Hypoxylon mammatum BIOLOGY H. mammatum overwinters as mycelium in the host tissues (generally not deeper than 8 mm in the wood), or as spores. Two types of spores are produced: (a) ascospores, liberated at high relative humidity and low temperature, are first produced 3 years after infection; (b
  2. Species: Hypoxylon mammatum; Distribution Table Top of page. The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be.
  3. Forest Health Protection Rocky Mountain Region • 2011 Hypoxylon Canker Uncommon but locally important canker of aspen Pathogen—Hypoxylon canker is caused by the fungus Entoleuca (Hypoxylon) mammatum. Hosts—Hypoxylon canker occurs on trembling aspen and a few other aspens.It occur
  4. Breakage of trees infected by Entoleuca mammata is a common feature associated with Hypoxylon canker. Fruiting structures of one stage of Hypoxylon mammatum, the cause of Hypoxylon canker. Trembling aspen infected by Entoleuca mammata, the cause of Hypoxylon canker. Note the yellowish color of the bark on the canker margin
  5. ed, but the symptoms are distinct

Known over the years as Hypoxylon pruinatum and H. mammatum, this pathogen was moved some years ago into the genus Entoleuca, giving the combination E. mammata ​ ​. The authors wanted to restrict the scope of the genus Hypoxylon to a core group that our species did not belong to Hypoxylon atropunctatum is commonly found on oak species, Hypoxylon mammatum attacks mostly aspen trees and Hypoxylon tinctor primarily infects sycamore trees Hypoxylon mammatum infects white poplars. You'll also find it on quaking and European aspens and pussy willows. Treating/Preventing Poplar Canker Diseases Keeping your trees healthy is the first step in preventing canker diseases Hypoxylon atropunctatum found on Oaks, Hypoxylon mammatum found on Aspen, and Hypoxylon tinctor found on Sycamores. Learn more about Hypoxylon Canker. Foliar Diseases: Foliar diseases are very common and caused by fungi that attack the leaves of the tree or shrub. Cercospora Leaf Spot Hypoxylon mammatum (Wahlenb.) P. Karst Hypoxylon pruinatum (Klotzsch) Cooke Hypoxylon morsei Berk. & M.A. Curtis Hypoxylon blakei Berk. & M.A. Curti

Hypoxylon mammatum (poplar canker) - CAB

Hypoxylon Canker Fungus Although it attacks several willow, poplar and aspen species, the Hypoxylon mammatum canker fungus most frequently targets quaking aspens growing east of the Great Plains... Hypoxylon mammatum toxins: possible involvement in canker development on aspen I. Genetet1 J. Pinon1 B. Bodo2 S. Rebuffat2 1 Laboratoire de Pathologie ForestiAre, tNRACRF, Champenoux F-54280, Seichamps, and 2 Museum National d'Histoire Naturetle, Chimie Appliqu6e aux Corps Organisés, CNRS UA40i, 63, rue Buffon, F-75231 Paris Cedex 05, France Introductio A new distribution map is provided for Hypoxylon mammatum (Wahl.) Miller. Hosts: Aspen and poplar (Populus spp.). Information is given on the geographical distribution in EUROPE, Czechoslovakia, USSR (Ukraine), NORTH AMERICA, Canada, United States (New England, Great Lake and western states) Describes H. mammatum, a cause of perennial cankers leading to the death of a number of hardwood species and Picea spp. It is particularly important for Poplars, especially Populus grandidentata, P. tacamahaca [P. balsamifera] and P. tremuloides. Several formae speciales may exist Hypoxylon mammatum is found only on hardwoods, most commonly on poplar and willow. In B.C., it has been reported on aspen, willow, and Sitka alder. Elsewhere in North America it has also been found on other poplar spp., birch, apple, oak, and hop-hornbeam

Hypoxylon is primarily a pathogen of the aspens, although occasionally certain hybrid poplars are also infected. Poplars in the Section Leuce (white poplars) should not be planted where Hypoxylon is known to be a problem industries. Hypoxylon mammatum (Wahl.) Mill, the causal agent of Hypoxylon canker, is the most important pathogen of aspen. Unrestricted infection to the main bole of the tree results in loss of wood quality and increases the risk of tree breakage. Studies of adult trees show tremendous clonal variation towards susceptibility to Hypoxylon. From the broth culture of the fungal pathogen Hypoxylon mammatum responsible for canker in aspen (Populus species) two new phytotoxins, hymatoxins K (2) and L (3), diterpenoid α-D-manno-pyranosides were isolated and their structures determined by mass spectrometry and 2D-NMR

Hypoxylon canke

Pouzar Z (1978) Hypoxylon macrocarpum Pouz. spec. nov., a new fragrant Pyrenomycete. — Ceská Mykologia 32: 19-21. Google Scholar Rogers JD, Ju YM (1996) Entoleuca mammata comb. nov. for Hypoxylon mammatum and the genus Entoleuca. — Mycotaxon 59: 441-448. Google Scholar Rayner RW (1970) A mycological colour chart. Commonwealth. VIEW ARTICLE. Ecology and Epidemiology The Role of Ascospores and Conidia as Propagules in the Disease Cycle of Hypoxylon mammatum. David H. Griffin, Faculty of Environmental and Forest Biology, College of Environmental Science and Forestry, State University of New York, 1 Forestry Drive, Syracuse 13210-2788; Kathleen E. Quinn, Gregory S. Gilbert, C. J. K. Wang, and Susan Rosemarin

Hypoxylon mammatum. Dansk: Hypoxylon-poppelkræft. Synonymer: Hypoxylon pruinatum. Engelsk: Hypoxylon cancer of poplar. Tysk: Rindenbrand der Pappel. Symptomer. Træer, som er 15-40 år, bliver sædvanligvis mest skadet. De første symptomer viser sig som svagt indsunkne partier i barken. De indsunkne partier har en gullig orange farve med. By D.L. Hawksworth, Published on 01/01/72. Journal/Book Title/Conference. CMI Descriptions of Pathogenic Fungi and Bacteri

Hypoxylon mammatum (Wahlenb.) J. Miller Ascomycetes : Sphaeriales Synonym U.pruinatum (KloWh)Cooke Common Names Hypoxylon canker of poplar Chancre du tremble Rindenbrand der Pappel Principal Hosts ( ) 4 Populus spp. In particular : trembling aspen P. tremuloides P. tremula aspen Less on : largeboth aspen P. grandidentata Also reported on : P. balsamgera (syn. P. tacamahaca) white poplar, abele. cycle of Hypoxylon mammatum. Phytopathology 82:114-119. Two lines of evidence, population structure and conidial germination properties, support the hypothesis that ascospores and not conidia disperse the fungus in the disease cycle of hypoxylon canker of aspen. Mycelial interactions, identified by the formation of a conidial interface betwee

Hypoxylon canker of aspen, Entoleuca mammata (Xylariales

Hypoxylon mammatum (Hypoxylon Canker of Aspen), synomyms Hypoxylon pruinatum & Entoleuca mammata. Photo was taken in Madison. Photo was taken at Festge County Park, Dane County. Hypoxylon canker, caused by Hypoxylon mammatum, is a fungal disease that, in our region, affects primarily trembling aspen, balsam poplar, and Swedish columnar aspen trees.. A patch of mottled orange and black bark marks the canker site. This disease is usually fatal once the trunk is infected. Where possible try to reduce wounding the trunk or branches to eliminate infection sites Hypoxylon Canker disease is an opportunistic fungal disease that infects trees both in good health and poor, but has far more success infecting weakened or dying trees. Hypoxylon Mammatum fungal infections have 3 stages of development and usually kills its host within four to eight years after infection J.D. Rogers & Y.M. Ju (syn. Hypoxylon mammatum (Wahlenb.) P. Karst.) causes the most damaging canker disease of quaking aspen (Populus tremuloides Michx.) - Hypoxylon canker - in many areas of North America. A study by Anderson (1964) in the Lake States (Michigan, Minnesota and Wisconsin) estimated that Hypoxylon canker killed 1-2% of the aspen.

From the broth culture of the fungal pathogen Hypoxylon mammatum responsible for canker in aspen (Populus species) two new phytotoxins, hymatoxins K (2) and L (3), diterpenoid α-D-manno-pyranosides were isolated and their structures determined by mass spectrometry and 2D-NMR Hypoxylon mammatum affects trembling (quaking), bigtooth, and European aspen, as well as white poplar, and pussy willow. The most conspicuous symptoms of these diseases are yellow, brown, or black areas in the bark that delineate the cankers. Many cankers are confined by host defense reactions soon after they form, an

Hypoxylon canker on trees can be an extremely destructive disease. It infects and often kills trees that are already weakened by poor conditions, disease, or damage. Knowing the signs could help you to save a tree if the disease has not yet spread to the trunk rot (Armillaria mellea et al.), Hypoxylon canker (Hypoxylon mammatum), Cytospora canker (Cytospora chrysosperma) and Ceratocystis canker (Ceratocystis spp.). Many other insects and diseases affect aspen. Most of these are natural stand-thinning agents. Defoliators (leaf eaters) such as forest tent caterpillar and gypsy moth seldom kil Hypoxylon mammatum ascospore infection of Populus tremuloides clones: effects of moisture stress in tissue culture. Phytopathology 79: 315-317. Falk, S., D. H. Griffin and P. D. Manion. 1989. Hypoxylon canker incidence and mortality in naturally occurring aspen clones. Plant Dis. 73: 384-397

Seedling response of two trembling aspen (Populus tremuloides) families to infection by Hypoxylon mammatum S. A. Enebak Auburn University, School of Forestry, Auburn, AL 36849, US Hypoxylon mammatum (Wahlenb.) P. Karst. (Synonym) Related Scientific Names: Hypoxylon mammatum (Wahlenb.) P. Karst (Synonym) Related Scientific Names: Hypoxylon morsei Berk. & M.A. Curtis (Synonym) Related Scientific Names: Hypoxylon pruinatum (Klotzsch) Cooke (Synonym) Related Scientific Names: Hypoxylon pruinatum (Klotzsch) Cooke (Synonym The major aspen diseases are Hypoxylon canker (Hypoxylon mammatum), and white rot (PDF) (Phellinus igniarius). Both can dramatically reduce how much healthy aspen you can sell. As stand age increases, volume losses due to insects and disease increase The role of ascospores and conidia as propagules in the disease cycle of Hypoxylon mammatum. Phytopathology 82: 114-119. Manion, P.D. & Griffin, D.H. (1986). Sixty-five years of research on Hypoxylon canker of aspen. Plant Dis. 70: 803-808. Ostry, M.E. & Anderson, N.A. (1995). Infection of Populus tremuloides by Hypoxylon mammatum ascospores. Hypoxylon mammatum. Canker disease of aspen. also causes white rot of oak and other species in eastern U.S. Trees may live many years with infection. USDA Forest Service - North Central Research Station , USDA Forest Service, Bugwood.org . Marion Murray. marion.murray@usu.edu Utah State University, Logan. 435-797-0776

Hypoxylon canker of shade trees - Wikipedi

Hypoxylon mammatum), and shoestring root rot (Armillaria mellea). This scenario, in which a primary agent stresses the tree and a secondary agent kills it, is known as oak decline and is responsible for considerable black oak mortality. Several species are removed in harvests, but yellow Kruger, B. M.; Manion, P. D. 1993. Sensitivity of Populus tremuloides to toxic metabolites of Hypoxylon mammatum and susceptibility to H. mammatum infection. Canadian Journal of Botany 71 (10): 1298-1303 Amino acid content of water-stressed plantlets of Populus tremuloides clones in relation to clonal susceptibility to Hypoxylon mammatum in vitro Author: Belanger, R.R.; Manion, P.D.; Griffin, D.H

By Arthur L. Schipper, Jr, Published on 01/01/76. Recommended Citation. Schipper, Jr, Arthur L., Hypoxylon pathotoxin necessary to the infection of aspen by Hypoxylon mammatum (1976) Taxon Concept NZOR Concept Id b770c9f0-e076-4168-a8f1-ffa53646e8f7 According to Rogers, J.D.; Ju, Y.M. 1996: Entoleuca mammata comb. nov. for Hypoxylon mammatum and. However, this variety exhibits more resistance to Hypoxylon mammatum by developing the noted calluses which slow or completely stop the canker growths. In a 20-year test at Rosemount, Minn. the other 574 aspen in the experiment averaged 2.9 cankers per tree. Members of this clone averaged 1.8 cankers per tree and callus tissue on the margins of. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): https://digitalcommons.usu.edu... (external link Hypoxylon mammatum - d glabrum Torr, oeptoria sp Acer negundo CytospOra.annula Daedallea undoolor. DendryphiopsiS atta Di 1 is atrata, lyolcoccum nigrm, Fonis lobatus Fusarium S.00..,Hypsizvems tessulatus MelanconiUm sp,. Nectria cinnabarina Otthia hypoxylon Pholiota cidapbsa Pholiota auriveila Pholiota speótabilis Pholiota squarrosoides.

Salt-and-Pepper (Hypoxylon) Canker Forest Patholog

Hypoxylon mammatum is an ascomycete (a fungus) that causes cankers on Aspen. Hypoxylon is reported to be an endophyte, existing quietly in the tree and then actively colonising areas that have been freshly wounded. Xanthomonas populi is a proteobacteria, and appears to be common on Aspen here. The bacteria enters the tree through stipule scars. SN/T 3434-2012 Detection and identification of Hypoxylon mammatum (Wahlenberg) J.Miller People's Republic of China Entry-Exit Inspection and Quarantine Standard Image 5366680 is of Hypoxylon canker of aspen (Entoleuca mammata ) symptoms on quaking aspen. It is by William Jacobi at Colorado State University. Symptoms of hypoxylon canker (Hypoxylon mammatum) on the trunk of an aspen tree (Populus tremuloides)

Hypoxylon fuscum

H. mammatum (Wahlenb.) J. H. Miller ] (8) and H. fuscum Pers. ex Fr. (10), members of Section Papillata, Subsection Primo-cinerea and Section Hypoxylon, respectively. The cytological study of H. multiforme, re? ported here, is part of a continuing investigation by the author on the biology, cytology, and development of Hypoxylon species A few of the more prominent damaging agents are forest tent caterpillar (Malacosoma disstria), large aspen tortrix (Choristoneura conflictana), Saperda borers (Saperda spp.), gypsy moth (Lymantria dispar), conks (Phellinus tremulae et al.), root rot (Armillaria mellea et al.), Hypoxylon canker (Hypoxylon mammatum), Cytospora canker (Cytospora. Preliminary findings from a study to gain information on the inflection process and genetics of resistance of the Hypoxylon canker fungue (Hypoxylon mammatum) on aspen (Populus tremuloides) indicate that the poplar-gall Saperda (Saperda inornata) may be involved. This paper describes the types of wounds made by the insect and how these and. Five single-ascospore isolates of Hypoxylon mammatum were used to produce metabolites in a chemically defined broth medium and in grain cultures. After treatment to remove high-molecular-weight materials, the culture filtrates and grain culture extracts were concentrated and tested for toxic activity against nine clones of Populus tremuloides.

Hypoxylon Canker Disease on Oak and Shade Trees

Hymatoxin A, a diterpene sulfate phytotoxin of Hypoxylon mammatum, parasite of aspen. Tetrahedron Lett. 28, 2355-2358. doi: 10.1016/S0040-4039(00)96123-9 CrossRef Full Text | Google Schola Histochemical and microspectrophotometric analyses of early wound responses of resistant and susceptible Populus tremuloides inoculated with Entoleuca mammata (≡Hypoxylon mammatum) B. Bucciarelli , M. E. Ostry, R. G. Fulcher, N. A. Anderson, C. P. Vanc Environmental Control Method: Hypoxylon Canker infects stressed trees. The environmental control is the process of reducing that stress. Firstly, removing and infected tree material where possible. Then testing and possible amendments to soil. Proper establishment of proper tree ring is highly recommended. Removal of any girdling Regression models were used to interpret the relationships among sensitivity of aspen to metabolites produced by Hypoxylon mammatum, disease incidence in the field, and several other clone and site variables. Twenty-nine naturally occurring aspen clones in central New York were intensively surveyed

Read ChemInform Abstract: Isolation and Structure Elucidation of Hymatoxins B ‐ E and Other Phytotoxins from Hypoxylon mammatum Fungal Pathogen of Leuce Poplars., ChemInform on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips Contextual translation of hypoxylon into English. Human translations with examples: hypoxylon, hypoxylon serpens, hypoxylon mammatum

Until 1994, Hypoxylon mammatum was considered a similar taxon to E. callimorpha. However, Læssøe and Spooner (1994) and Læssøe (1994) treated H. mammatum as a separate, synonym to Rosellinia . Based on these taxonomic confusions, Rogers and Ju (1996) revised the type, authentic and other specimens and re-established the genus Entoleuca Infection of Populus tremuloides by Hypoxylon mammatum ascospores through Saperda inornata galls . By Michael E. Ostry and Neil A. Anderson. Topics: forest trees, infection, ascospores, galls.

Hypoxylon Canker - Forest Health and Adaptation

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Prepared by CABI and EPPO for the E Emoleuca mammata (Wahlenberg: A pathogenic culture of E. mammata was isolated from a can-FrO J.D. Rogers & Y.-M. Ju (=--Hypoxylon mammatum kered aspen grown at the poplar research plantation at the Uni-(Wahlenberg:Fr.) P. Karst.) (Rogers and Ju 1996), the causal versity of Minnesota Agricultural Research Station (Rosemount, Minn.) twolined chestnut borer (Agrilus bilineatus), Hypoxylon canker (Hypoxylon mammatum), and shoestring root rot (Armillaria mellea). This scenario, in which a primary agent stresses the tree and a secondary agent kills it, is known as oak decline • Yellow-poplar removals are nearly double or more, by volume, than most species except sugar mapl Ascospores of Hypoxylon mammatum germinated in the sapwood of naturally occurring trembling aspen. L'O. penicillatum semble être mieux adapté à coloniser le phloème que l' aubier. Ophiostoma penicillatum seems to be more adapted to colonizing the phloem than the sapwood Hypoxylon mammatum hypoxylon mediterraneum Hypoxylon mediterraneum hypoxylon serpens Hypoxylon serpens hypromellose hyprostosis hypoxylon in Persian English-Persian dictionary. hypoxylon taxonomic terms (fungi) translations hypoxylon Add . هیپوکسیلو

Treating Poplar Canker Diseases: How To Manage Canker

Note: Citations are based on reference standards. However, formatting rules can vary widely between applications and fields of interest or study. The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied haasova koprenka hadrijanov mavrahovec hartigov plutač hibridna korenovka hibridna plamenka (predirna plamenka) hijacintna polževka hirsek (rjavi ježevec) hišna goba (hišni lesomor) hladnik (užitni smrček) hmeljarka (sivi lupinar) hojčnica (navadna kostanjevka) hojeva apnenka (jelkova apnenka) hojeva polževk

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Hypoxylon canker of aspen (Entoleuca mammata ) on quaking

Borealis rootbutt diseases yellow pitted rot hericium. This preview shows page 385 - 388 out of 449 pages. National Core Field Guide, Version 9.0, October, 2019 Appendix 11. Damage Codes 372 CODE Category Agent Common Name Scientific Name General Category Designation Threshold REGION 22007 22 007 Atropellis canker Atropellis piniphila Cankers. Hypoxylon canker, Hypoxylon mammatum. Particularly damaging to quaking and big-tooth aspen, occasionally to balsam poplar, but not to our eastern cottonwood. Bark cankers are first sunken, with yellow-orange areas surrounded by irregular margins, and then bark blisters and sloughs off Hypoxylon canker. Entoleuca mammata (syn. Hypoxylon mammatum) causes the most damaging canker disease of quaking aspen (Populus tremuloides) in many areas of North America. This chapter focuses on the epidemiology and management of Hypoxylon canker. Information is given on pathogen distribution, host range, detection and infection biology

Common Tree Fungus - Tree Fungal Diseases In VA, DC, M

Another part of this study concerns the detectability of hypoxylon canker (Hypoxylon mammatum, Miller) within aspen (Populus tremuloides, Michx) stands. Hypoxylon canker occurs throughout the range of trembling aspen, except in Alaska (20). It is the lack of hypoxylon canker within the Alaskan forest that gives importance to this portion of the. The major diseases of aspen are the canker Hypoxylon mammatum, and white rot Phellinus igniarius. Hypoxylon causes annual losses which approach the net annual aspen growth. White rot decay can reduce gross merchantable yields by up to 10% with 50% of the trees infected. Management recommendations are as follows: 1 Figu re 6. Hypoxylon trunk canker and wood rot of quaking aspen (Populus tremuloides) caussed by Hypoxylon mammatum. Entry probably occurred through a mowing bruise at the trunk base. punctures; breaks due to ice, snow, and windstorms; and dwarf mistletoe cankers. Other infections may occur through dead branches and tree stumps Hypoxylon canker (aspen) Hypoxylon mammatum Incense-cedar mistletoe Phoradendron juniperinum subsp. libocedri Incense-cedar rust Gymnosporangium libocedri Inconspicuous juniper rust Gymnosporangium inconspicuum Indian paint fungus (conifers) See rust red stringy rot Ink spo Hypoxylon mammatum Melampsora farlowii Melampsora medusa Monilinia fructicola Mycosphaerella larici-leptolepis Mycosphaerella populorum Phellinus weirii Phoma andigena Phoma exiqua var. foveata Phyllosticta solitaria Phymatotrichopsis omnivora Phytophthora fragariae Phytophthora ramorum Septoria lycopersici var. malagutii Thecaphora solan

Hypoxylon canker of shade trees

Hypoxylon mammatum - Bugwoodwik

Hypoxylon canker of aspen. Hypoxylon mammatum. Nectria canker. Nectria galligena. coral spot disease. Nectria cinnabarina. black knot of cherry. Apiosporina morbosa. western gall rust. Endocronartium harknessii. blue stain. Ophiostoma spp. eastern dwarf mistletoe. Arceuthobium pusillum Hypoxylon mammatum Hypoxylon rubiginosum Hypoxylon rubiginosum var. ferrugineum Hypoxylon sp. Kretzschmaria deusta Xylaria castorea Xylaria cubensis Xylaria hypoxylon Xylaria longipes Xylaria polymorpha Xylaria sp. Basidiomycota Agaricomycetes Agaricales Agaricaceae Agaricus abruptibulbu Hypoxylon blakei Berk. & M.A.Curtis Hypoxylon depauperatum P.Karst. Hypoxylon holwayi Ellis Hypoxylon mammatum (Wahlenb.) P.Karst. Hypoxylon morsei Berk. & M.A.Curtis Hypoxylon pauperatum P.Karst. Hypoxylon pruinatum (Klotzsch) Cooke Nemania mammata (Wahlenb.) Granmo Rosellinia pruinata (Klotzsch) Sacc Hypoxylon mammatum is the species name listed in the Council Directive 2000/29/EC and the Terms of Reference (ToR). The species was renamed as Entoleuca mammata following a stricter definition of the genus (Rogers and Ju, 1996) Hypoxylon Canker (Entoleuca (Hypoxylon) mammatum) 07/04/1999. 31/12/9999. 130. DSP. Cryptosphaeria Canker (Cryptosphaeria populina) 07/04/1999. 31/12/9999. 131. DSR. Ceratocystis Canker (Ceratocystis fimbriata) 07/04/1999. 31/12/9999. 132. DSS. Stalactiform Blister Rust (Cronartium coleosporioides) 01/01/1905. 31/12/9999. 133. DS

Monilinia fructicola (MONIFC)[Photos]| EPPO Global DatabaseStem Diseases Hdwd

Tall and elegant, the poplar tree is an ideal way to bring structure, focus and shade into your garden. An attractive deciduous plant, the poplar tree is a great choice if you want to introduce privacy or shelter to an outdoor space.. Thriving in warm weather and moist soil, most varieties are hardy in USDA Zones 3 to 9.. Most poplar tree varieties are easily identified by their foliage Hypoxylon mammatum P. Karst. 1866 Sphaeria pruinata Klotzsch 1833 Sphaeria mammata Wahlenb. 1826. An Entoleuca mammata in uska species han Fungi in nahilalakip ha divisio nga Ascomycota, ngan nga syahan ginhulagway ni Göran Wahlenberg, ngan ginhatag han pagkayana nga asya nga ngaran ni Jack David Rogers och Yu Ming Ju hadton 1996 mammatum, Hypoxylon illitum and N. discreta, 13 by H. mammatum, 14 by H. illitum and 15 by Hypoxylon atropunctatum [26]. Mellein 5-carboxylic acid (12), together with 5-methyl mellein (4), (S)-(+)-mellein (2) and other compounds, was isolated from Phomopsis oblonga in a study for the production of elm bark beetl Hypoxylon canker, HyPoxylon mammatum w. spruce w. spruce w. spruce B. poplar T. aspen BEAUVAIS LAKE PARK Organism Insect Gall aphids, W. spruce Adelses !p.:.. Budworm, Limber pine Choristoneura lambertiana Leaf tier, T. aspen Pseudexentera oresonana Poplar borer, T. aspen Sap erda calcarata Disease Shoestring root rot, Armillaria -melle Identification and pathogenicity of isolates of Hypoxylon mammatum and resistance of willows and aspens to these isolates. M.S. 1990. Necmettin Bolat. Alan P. Roelfs. Stem rust resistance of selected durum wheats. M.S. 1990 Among the dominant species found on aspen, three species with presumed pathogenic abilities were isolated. These were Cryptosphaeria populina, Cytospora chrysosperma and Hypoxylon mammatum. Hypoxylon fragifarme was the most frequently and abundantly isolated species obtained from beech