The first data on fungal pathogens (ascomycota, hypocreales) in the invasive populations of four-eyed fir bark beetle Polygraphus proximus Blandf.

2017 ◽  
Vol 8 (1) ◽  
pp. 34-40 ◽  
Author(s):  
I. A. Kerchev ◽  
V. Yu. Kryukov ◽  
O. N. Yaroslavtseva ◽  
G. P. Polovinko ◽  
Yu. S. Tokarev ◽  
...  
Keyword(s):  
Bark Beetle ◽  
Fungal Pathogens ◽  
Polygraphus Proximus

scholarly journals Bark beetle associated trematurid mites (Acari: Uropodina: Trematuridae) from Asian Russia with description of a new species

2019 ◽  
Vol 24 (9) ◽  
pp. 1592-1603 ◽  
Author(s):  
Jeno Kontschán ◽  
Gábor Szőcs ◽  
Balázs Kiss ◽  
Alexander A. Khaustov
Keyword(s):  
New Species ◽  
Bark Beetle ◽  
Bark Beetles ◽  
Beetle Species ◽  
New Associations ◽  
Polygraphus Proximus ◽  
Associated Species ◽  
A New Species ◽  
Different Parts

A new Oodinychus Berlese, 1917 species, O. scolytana sp. nov., was discovered and described from the galleries of bark beetles Polygraphus proximus Blandford from two different parts of Asian Russia. New associations are given for the trematurid mites and bark beetle species. Three bark beetle associated species from the Trichouropoda ovalis-group are moved into the genus Oodinychus as O. hirsuta (Hirschmann, 1972) comb. nov., O. rafalski (Wiśniewski & Hirschmann, 1984) comb. nov. and O. wilkinsoni (Hirschmann &Wiśniewski, 1986) comb. nov. Also, Oodinychus egypticus Abo-Shnaf, El-Bishlawy & Allam, 2018 is transferred to the genus Nenteria Oudemans, 1915.

scholarly journals Bacteria Belonging to Pseudomonas typographi sp. nov. from the Bark Beetle Ips typographus Have Genomic Potential to Aid in the Host Ecology

Insects ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 593
Author(s):  
Ezequiel Peral-Aranega ◽  
Zaki Saati-Santamaría ◽  
Miroslav Kolařik ◽  
Raúl Rivas ◽  
Paula García-Fraile
Keyword(s):  
Bark Beetle ◽  
Fungal Pathogens ◽  
Pathogenic Fungi ◽  
Gene Clusters ◽  
Ips Typographus ◽  
In Vitro Tests ◽  
Defense Compounds ◽  
Genes Encoding ◽  
Host Ecology

European Bark Beetle Ips typographus is a secondary pest that affects dead and weakened spruce trees (Picea genus). Under certain environmental conditions, it has massive outbreaks, resulting in the attacks of healthy trees, becoming a forest pest. It has been proposed that the bark beetle’s microbiome plays a key role in the insect’s ecology, providing nutrients, inhibiting pathogens, and degrading tree defense compounds, among other probable traits yet to be discovered. During a study of bacterial associates from I. typographus, we isolated three strains identified as Pseudomonas from different beetle life stages. A polyphasic taxonomical approach showed that they belong to a new species for which the name Pseudomonas typographi sp nov. is proposed. Genome sequences show their potential to hydrolyze wood compounds and synthesize several vitamins; screening for enzymes production was verified using PNP substrates. Assays in Petri dishes confirmed cellulose and xylan hydrolysis. Moreover, the genomes harbor genes encoding chitinases and gene clusters involved in the synthesis of secondary metabolites with antimicrobial potential. In vitro tests confirmed the capability of the three P. typographi strains to inhibit several Ips beetles’ pathogenic fungi. Altogether, these results suggest that P. typographi aids I. typographi nutrition and resistance to fungal pathogens.

Impacts Of The Invasive FourEyed Fir Bark Beetle (Polygraphus Proximus Blandf.) On Siberian Fir (Abies Sibirica Ledeb.) Forests In Southern Siberia

2019 ◽  
Vol 12 (3) ◽  
pp. 79-97 ◽  
Author(s):  
Nikita M. Debkov ◽  
Aleksey A. Aleinikov ◽  
Alexander Gradel ◽  
Anatoly Yu. Bocharov ◽  
Nina V. Klimova ◽  
...  
Keyword(s):  
Bark Beetle ◽  
Stand Density ◽  
Average Diameter ◽  
Direct Result ◽  
Tree Level ◽  
Potential Threat ◽  
Siberian Fir ◽  
Abies Sibirica ◽  
Ontogenetic Structure ◽  
Polygraphus Proximus

The emergence and spread of non-native invasive forest insects represent a major potential threat to global biodiversity. The present study examines the current invasion of the far eastern four-eyed fir bark beetle Polygraphus proximus Blandf. in southern Siberian fir (Abies sibirica Ledeb.) forests. We collected data on 38 large sized (2500 m²) sample plots, situated in fir forests of the Tomsk region. As a direct result of the four-eyed fir bark beetle infestation, stand density decreased by 34-37%, and stand volume by 30%. The mean height, individual age and diameter at the stand level consequently increased. Our results indicated that stands with complete left-sided or normal ontogenetic structure (composed primarily of late virginal firs or firs in young reproductive stage) are more resistant to invasion by the four-eyed fir bark beetle. By contrast, fir forests characterized by more right-sided ontogenetic structure (composed primarily of mature and old reproductive firs), exhibited the least resistance and, with rare exception, degraded rapidly in response to the invasion. Our results also pointed to a mechanism that initiates invasions of the four-eyed fir bark beetle in fir stands of all types of ontogenetic structure, which is the attack of virginal trees and trees in early reproductive stages. Trees up to average diameter are the most susceptible to invasions of the bark beetle. We identified thicker bark, larger DBH and low occurrence of heart rot as the most important parameters for indicating resistance at the single tree level. DBH and bark thickness (p<0.05) correlated significantly with tree health status in infested stands. Our overall assessment of the potential natural regeneration of damaged stands is that the Siberian fir forests are resilient to invasive species and that the fir ecosystems can potentially recover from this disturbance.

FINDING OF THE BARK BEETLE POLYGRAPHUS PROXIMUS BLANDFORD, 1894 (COLEOPTERA, CURCULIONIDAE: SCOLYTINAE) IN UDMURTIA

2021 ◽  
Vol 14 (2) ◽  
pp. 32-39
Author(s):  
S. V. Dedyukhin ◽  
V. V. Titova
Keyword(s):  
Bark Beetle ◽  
Natural Forests ◽  
Siberian Fir ◽  
Longhorn Beetles ◽  
Polygraphus Proximus ◽  
Udmurt Republic ◽  
Local Species ◽  
The Republic ◽  
Far Eastern

The data on the first finds in the Udmurt Republic (and the East of European Russia as a whole) of a dangerous invasive species of bark beetle of the Far Eastern origin - Polygraphus proximus Blandford, 1894, are presented. The species was discovered in 2019 simultaneously in four districts (Zavyalovsky, Malopurginsky, Kiyasovsky and Sarapulsky) of the central and southern parts of the republic. The established areas damaged by the Polygraphus proximus of forest stands are located both near railway tracks and highways, and in the depths of natural forests in which Siberian fir grows ( Abies sibirica Ledeb.), which indicates a long-term hidden invasion of the pest and its adaptation in Udmurtia. Further outbreak of the pest can lead to catastrophic consequences for forests with the participation of fir in the region. In addition, in the stands damaged by the Polygraphus proximus , an increase in the number of local species of longhorn beetles, associated with fir, is possible. In connection with the extreme potential harmfulness of this invader, it is necessary to carry out sanitary and recreational activities in order to localize and eliminate the identified outbreak foci of the pest, as well as to clarify the forest areas occupied by the Polygraphus proximus in the territory of the Udmurt Republic and adjacent regions, with introduction of quarantine and monitoring measures.

Sign in / Sign up

Export Citation Format

Share Document