scholarly journals A study of landing behaviour by the walnut twig beetle, Pityophthorus juglandis , among host and nonhost hardwood trees in a northern California riparian forest

2020 ◽  
Vol 22 (4) ◽  
pp. 338-348 ◽  
Author(s):  
Jackson P. Audley ◽  
Crystal S. Homicz ◽  
Richard M. Bostock ◽  
Steven J. Seybold
Keyword(s):  
Riparian Forest ◽  
Northern California ◽  
Pityophthorus Juglandis ◽  
Hardwood Trees ◽  
Walnut Twig Beetle

Walnut twig beetle landing rates differ between host and nonhost hardwood trees under the influence of aggregation pheromone in a northern California riparian forest

2020 ◽  
Author(s):  
Crystal S. Homicz ◽  
Jackson P. Audley ◽  
Yigen Chen ◽  
Richard M. Bostock ◽  
Catherine A. Tauber ◽  
...  
Keyword(s):  
Aggregation Pheromone ◽  
Riparian Forest ◽  
Northern California ◽  
Hardwood Trees ◽  
Walnut Twig Beetle

scholarly journals Insects collected from wood infested with Pityophthorus juglandis Blackman (Coleoptera Curculionidae Scolytinae) in the Piemonte region, Northwestern Italy

2018 ◽  
pp. 21-30 ◽  
Author(s):  
Giovanni Bosio ◽  
Crystal Cooke-McEwen
Keyword(s):  
First Record ◽  
Northern Italy ◽  
Black Walnut ◽  
Northern California ◽  
Pityophthorus Juglandis ◽  
Thousand Cankers Disease ◽  
Multiple Species ◽  
Walnut Twig Beetle ◽  
First Time ◽  
Accidental Introduction

The walnut twig beetle, Pityophthorus juglandis Blackman (Coleoptera Curculionidae Scolytinae), and thousand cankers disease are documented in the Piemonte region of Northern Italy for the first time.  Northern California is found to be the likely origin of the Piemonte walnut twig beetles based on the comparison of CO1 haplotypes. Multiple species of parasitoids have been reared from black walnut wood infested with the invasive walnut twig beetle.  These rearings constitute the first record of the genus Neocalosoter Girault and Dodd (Hymenoptera Pteromalidae Cerocephalinae) in Europe and are likely due to accidental introduction along with the host beetle. Two specimens of Theocolax spp. are described as morphological anomalies with geographical origins unknown.   

Diurnal flight response of the walnut twig beetle, Pityophthorus juglandis Blackman (Coleoptera: Scolytidae), to pheromone-baited traps in two northern California walnut habitats

2012 ◽  
Vol 88 (2) ◽  
pp. 231-247 ◽  
Author(s):  
Steven J. Seybold ◽  
Jennifer A. King ◽  
Daren R. Harris ◽  
Lori J. Nelson ◽  
Shakeeb M. Hamud ◽  
...  
Keyword(s):  
Northern California ◽  
Flight Response ◽  
Pityophthorus Juglandis ◽  
Baited Traps ◽  
Walnut Twig Beetle

scholarly journals Dispersal and colonization risk of the Walnut Twig Beetle, Pityophthorus juglandis, in southern Europe

2021 ◽  
Author(s):  
Matteo Marchioro ◽  
Massimo Faccoli
Keyword(s):  
Spatiotemporal Data ◽  
Medium Size ◽  
Dispersal Capacity ◽  
Factors Affecting ◽  
Geosmithia Morbida ◽  
Ne Italy ◽  
Pityophthorus Juglandis ◽  
Southwestern Usa ◽  
Walnut Twig Beetle ◽  
First Time

AbstractThe Walnut Twig Beetle (WTB), Pityophthorus juglandis Blackman, is a small bark beetle native to Mexico and Southwestern USA recorded for the first time in Europe (NE Italy) in 2013. WTB attacks walnut (Juglans spp.) and wingnut trees (Pterocarya spp.) and is the vector of Geosmithia morbida Kolarík et al., a pathogen causing the thousand cankers disease (TCD). WTB and TCD represent a serious threat for walnut orchards in Europe. Spatiotemporal data of the WTB-TCD infestations recorded from an 8-year-long (2013–2020) monitoring conducted in 106 walnut orchards of NE Italy were used to develop a model in order to analyze: (i) the effective dispersal capacity of WTB, (ii) the factors affecting dispersal and (iii) the colonization risk of healthy walnut orchards. We registered a mean annual dispersal of 9.4 km, with peaks of about 40 km. Pest dispersal is affected by distance of suitable hosts from the nearest infested site, number of walnut orchards in the surroundings (both infested and healthy), orchard size and walnut species in the orchard. Using the model, it was also possible to calculate the colonization risk of a specific walnut orchard according to its characteristics showing, for instance, that a medium-size (5,000 trees) black walnut orchard located at 25 km from the nearest infested orchard has an infestation risk of about 50% of probability.

Trap Assays of the Walnut Twig Beetle, Pityophthorus juglandis Blackman (Coleoptera: Curculionidae: Scolytinae), Reveal an Effective Semiochemical Repellent Combination

2020 ◽  
Vol 46 (11-12) ◽  
pp. 1047-1058 ◽  
Author(s):  
Jackson P. Audley ◽  
Richard M. Bostock ◽  
Steven J. Seybold
Keyword(s):  
Pityophthorus Juglandis ◽  
Walnut Twig Beetle

scholarly journals Detection of Geosmithia morbida on Numerous Insect Species in Four Eastern States

2019 ◽  
Vol 20 (3) ◽  
pp. 133-139 ◽  
Author(s):  
Melanie Moore ◽  
Jennifer Juzwik ◽  
Fredric Miller ◽  
Leah Roberts ◽  
Matthew D. Ginzel
Keyword(s):  
Bark Beetles ◽  
Adult Emergence ◽  
Juglans Nigra ◽  
Insect Species ◽  
Geosmithia Morbida ◽  
Pityophthorus Juglandis ◽  
Thousand Cankers Disease ◽  
Branch Dieback ◽  
Walnut Twig Beetle ◽  
Β Tubulin

Thousand cankers disease is caused by the coalescence of numerous Geosmithia morbida cankers on branches and stems of Juglans species, leading to branch dieback and eventual tree death. The fungus sporulates in galleries of the walnut twig beetle (Pityophthorus juglandis), allowing for acquisition of pathogen propagules and its subsequent transmission to other branches or trees following adult emergence. Recently, G. morbida has been isolated from Xylosandrus crassiusculus and Xyleborinus saxesenii collected in Ohio and Stenomimus pallidus collected in Indiana. These beetles are known to colonize diseased Juglans nigra in these states. In this study, an operational trap survey for ambrosia beetles, bark beetles, and other weevils was conducted in four eastern states, and captured beetles were assayed to detect G. morbida using both culture and PCR-based methods. A new primer pair (GmF3/GmR13), based on the β-tubulin region, was designed for G. morbida DNA detection. The pathogen was detected on 18 insect species using molecular methods, and live cultures were isolated from two species. This is the first report of the pathogen in Illinois and Minnesota.

scholarly journals Discovery of Walnut Twig Beetle, Pityophthorus juglandis, Associated with Forested Black Walnut, Juglans nigra, in the Eastern U.S.

Forests ◽  
2014 ◽  
Vol 5 (6) ◽  
pp. 1185-1193 ◽  
Author(s):  
Gregory Wiggins ◽  
Jerome Grant ◽  
Paris Lambdin ◽  
Paul Merten ◽  
Katheryne Nix ◽  
...  
Keyword(s):  
Black Walnut ◽  
Juglans Nigra ◽  
Pityophthorus Juglandis ◽  
Walnut Twig Beetle

scholarly journals Effect of Bark Application With Beauveria bassiana and Permethrin Insecticide on the Walnut Twig Beetle (Coleoptera: Curculionidae) in Black Walnut Bolts

2019 ◽  
Vol 112 (5) ◽  
pp. 2493-2496 ◽  
Author(s):  
Albert E Mayfield ◽  
Jennifer Juzwik ◽  
Jamison Scholer ◽  
John D Vandenberg ◽  
Adam Taylor
Keyword(s):  
Beauveria Bassiana ◽  
Black Walnut ◽  
Control Treatment ◽  
Eastern United States ◽  
Water Control ◽  
Short Term ◽  
Pityophthorus Juglandis ◽  
Thousand Cankers Disease ◽  
Commercial Applications ◽  
Walnut Twig Beetle

Abstract Formulations of entomopathogenic (insect-killing) fungi represent alternatives to synthetic insecticides in the management of forest and shade tree insects. We evaluated bark spray applications of the entomopathogen Beauveria bassiana (Balsamo) Vuillemin (Hypocreales: Cordycipitaceae) strain GHA (BotaniGardES), permethrin insecticide (Astro), and water (control) on colonization of black walnut (Juglans nigra L.) (Fagales: Juglandaceae) bolts by the walnut twig beetle (Pityophthorus juglandis Blackman) (Coleoptera: Curculionidae), vector of the fungus that causes thousand cankers disease. Treated bolts were baited with a P. juglandis aggregation pheromone lure and deployed in infested walnut trees. Bark application of permethrin prevented P. juglandis colonization of the phloem. Although treatment of bolts with the B. bassiana suspension did not reduce P. juglandis colonization or short-term emergence relative to the control treatment, it increased the B. bassiana infection rate from 25 to 62% of emerged adults. Results suggest that commercial applications of B. bassiana strain GHA may help augment natural levels of infection by this entomopathogen in the eastern United States, and support continued exploration of entomopathogens for biological control of the walnut twig beetle.

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