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... The genus Calonectria includes many aggressive plant pathogens causing diseases on various agricultural crops as well as forestry and ornamental tree species. Some species have been accidentally introduced into new environments via international trade of putatively asymptomatic plant germplasm or contaminated soil, resulting in significant economic losses. This review provides an overview of the t ...
... PURPOSE OF REVIEW: The Araucariaceae is a family of ancient conifers containing iconic tree species from diverse parts of the world. Thirty-eight extant species are present in three genera. Extensive reduction of natural populations has occurred for many species of Araucariaceae, largely due to anthropogenic disturbances. This has occurred to the extent where most species are classified at some le ...
... Syzygium cordatum (Myrtacease) is one of the most common encountered and widely distributed tree species indigenous to South Africa. This tree is often affected by a malformation disease characterized by grossly misshapen inflorescences that do not bear fruit. Because such symptoms have previously been attributed to Fusarium species in other plants, the aim of this study was to determine the diver ...
... Quambalaria are fungal pathogens of Corymbia, Eucalyptus and related genera of Myrtaceae. They are smut fungi (Ustilaginomycota) described from structures that resemble conidia and conidiophores. Whether these spore forms have asexual or sexual roles in life cycles of Quambalaria is unknown. An epidemic of Q. pitereka destroyed plantations of Corymbia in New South Wales and Queensland (Australia) ...
... Next-generation sequencing (NGS) has revolutionized research on fungi including Botryosphaeriaceae, a family of important plant and particularly tree pathogens. This review highlights the impact that NGS-generated genomes and transcriptomes have had on our understanding of the biology and evolution of these fungi. In less than a decade, 49 genomes representing 31 species in eight genera have been ...
Acacia mearnsii; DNA barcoding; Eucalyptus grandis; Phytophthora; community structure; inoculum; microbial ecology; roots; soil; species richness; trees; South Africa
Abstract:
... Roots act as a biological filter that exclusively allows only a portion of the soil-associated microbial diversity to infect the plant. This microbial diversity includes organisms both beneficial and detrimental to plants. Phytophthora species are among the most important groups of detrimental microbes that cause various soil-borne plant diseases. We used a metabarcoding approach with Phytophthora ...
Ambrosia; Bostrichidae; Ceratocystiopsis; Curculionidae; Raffaelea; Scolytidae; ambrosia beetles; forests; fungi; new species; nucleotide sequences; nutrition; symbionts; wood; South Africa
Abstract:
... Ambrosia beetles are small wood inhabiting members of the Curculionidae that have evolved obligate symbioses with fungi. The fungal symbionts concentrate nutrients from within infested trees into a usable form for their beetle partners, which then utilize the fungi as their primary source of nutrition. Ambrosia beetle species associate with one or more primary symbiotic fungal species, but they al ...
... Breeding strategies for plants focus on the genetic influence on their phenotypes. However, the phenotype is not only the outcome of the genotype or the environmental conditions under which plants grow. It is important to also recognise that the maternal environment has a significant effect on the phenotype of the offspring. These maternal effects represent a transgenerational form of phenotypic p ...
... Biodiversity and economic losses resulting from invasive plant pests and pathogens are increasing globally. For these impacts and threats to be managed effectively, appropriate methods of surveillance, detection and identification are required. Botanical gardens provide a unique opportunity for biosecurity as they accommodate diverse collections of exotic and native plant species. These gardens ar ...
... Eucalypt plantations in South Africa make up an important part of the local forestry industry. Recently, one-year-old nursery plants of a Eucalyptus grandis × Eucalyptus urophylla variety displayed symptoms of leaf and shoot anthracnose disease. Samples were collected from these plants and isolations were made from the disease symptoms. Isolates were identified based on their morphological charact ...
... Sap beetles (Coleoptera: Nitidulidae) are commonly associated with ophiostomatoid fungi, especially those belonging to the family Ceratocystidaceae. This coexistence of insects and fungi, usually on tree wounds, offers the ophiostomatoid fungi an effective means of dispersal. The selective advantage of this association to sap beetles is, however, confounded by the versatile life history strategies ...
MichaelJ. Wingfield, et al. ; Michelle L. Schröder; Helen F. Nahrung; Natalia M. de Souza; Simon A. Lawson; Bernard Slippers; Brett P. Hurley; Show all 7 Authors
Anaphes nitens; DNA barcoding; Eucalyptus; biological control; cryptic species; eggs; parasitic wasps; species diversity; Tasmania
Abstract:
... Gonipterus species are pests of Eucalyptus plantations worldwide. The egg parasitoid wasp Anaphes nitens is used in many countries for the biological control of Gonipterus spp. Recent taxonomic studies have shown that the three invasive Gonipterus spp., which were previously considered as G. scutellatus, form part of a cryptic species complex. These taxonomic changes have implications for the biol ...
Anaphes nitens; Gonipterus scutellatus; cryptic species; eggs; new species; parasitoids; species diversity
Abstract:
... Gonipterus scutellatus (Coleoptera: Curculionidae), once thought to be a single species, is now known to reside in a complex of at least eight cryptic species. Two of these species (G. platensis and G. pulverulentus) and an undescribed species (Gonipterus sp. n. 2) are invasive pests on five continents. A single population of Anaphes nitens, an egg parasitoid, has been used to control all three sp ...
Grosmannia; Leptographium; bark beetles; calmodulin; fungi; genes; internal transcribed spacers; new species; peptide elongation factors; phylogeny; surveys; tubulin; wood staining; China; United States
Abstract:
... The Grosmannia penicillata complex (Ophiostomatales, Ascomycota) is one of the major species complexes in Leptographium sensu lato. Most of these are wood staining fungi associated with conifer-infesting bark beetles, and the complex encompasses the type species of the genus Grosmannia. Yet the phylogenetic relationships of species within the complex is unresolved. The aim of this study was to re- ...
... The genus Calonectria accommodates many important pathogens of agricultural, horticultural and forestry crops, including Eucalyptus. During 2017 surveys of Eucalyptus diseases in Sabah, Malaysia, typical symptoms of Calonectria leaf blight were observed. A large number of Calonectria isolates were collected from diseased leaves and soils associated with symptomatic trees. The aim of this study was ...
Lasiodiplodia; Neofusicoccum parvum; alleles; ecology; genetic markers; microsatellite repeats; plant pathogenic fungi; population genetics; tree diseases
Abstract:
... Population genetic studies play an integral role in understanding the ecology and management of fungal plant pathogens. Such studies for species of Botryosphaeriaceae are hampered by a lack of available markers. Genomic sequences are available for multiple species in this family and they provide excellent resources for the development of population genetic markers. Here we describe highly transfer ...
MichaelJ. Wingfield, et al. ; Nam Q. Pham; Seonju Marincowitz; Myriam Solís; Tuan A. Duong; Brenda D. Wingfield; Irene Barnes; Bernard Slippers; Jupiter I. Muro Abad; Alvaro Durán; Show all 10 Authors
... In 2014, a new and serious leaf and shoot disease of unknown aetiology appeared in Eucalyptus plantations of North Sumatra, Indonesia. The disease is characterized by black necrotic spots that initially appear on young leaves and petioles, which become scab‐like as the lesions age. Infected trees respond to infection by producing shoots with small leaves that commonly appear feathered. Fruiting st ...
Cossidae; Elsinoe; Eucalyptus; Helopeltis; Neofusicoccum; abnormal development; disease severity; forests; fungi; moths; new species; species diversity; Indonesia
Abstract:
... The Botryosphaeriaceae is an important and diverse family of latent fungal pathogens of woody plants, including Eucalyptus. These fungi live within infected plant tissues for extended periods without causing symptoms, but emerge to cause severe disease when their hosts are subjected to stress. In this study, we compared the diversity of the Botryosphaeriaceae in samples from nine different Eucalyp ...
... PURPOSE OF REVIEW: Within the discipline of invasion science, researchers studying different taxonomic groups have developed distinct ways of investigating the phenomenon of biological invasions. While there have been efforts to reconcile these differences, a lack of knowledge of diversity, biogeography and ecology hampers researchers seeking to understand invasive microorganisms, including invasi ...
Bayesian theory; Eucalyptus; Thaumastocoridae; forestry; genetic variation; insect pests; microsatellite repeats; Africa; Queensland; South America
Abstract:
... Insect pest invasions pose a major threat to agriculture, forestry and many natural ecosystems. Thaumastocoris peregrinus is an invasive sap-sucking pest of significant economic importance to Eucalyptus forestry that has recently invaded several countries worldwide. In this study we identify the origin and retrace the invasion history of T. peregrinus. We analysed samples from six locations in Afr ...