scholarly journals Gut Bacterial Communities of Dendroctonus valens and Monoterpenes and Carbohydrates of Pinus tabuliformis at Different Attack Densities to Host Pines

2018 ◽  
Vol 9 ◽  
Author(s):  
Dandan Xu ◽  
Letian Xu ◽  
Fangyuan Zhou ◽  
Bo Wang ◽  
Shanshan Wang ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Dendroctonus Valens ◽  
Pinus Tabuliformis

Verbenone interrupts attraction to host volatiles and reduces attack on Pinus tabuliformis (Pinaceae) by Dendroctonus valens (Coleoptera: Scolytidae) in the People's Republic of China

2003 ◽  
Vol 135 (5) ◽  
pp. 721-732 ◽  
Author(s):  
Jianghua Sun ◽  
Nancy E. Gillette ◽  
Zhengwan Miao ◽  
Le Kang ◽  
Zhongning Zhang ◽  
...  
Keyword(s):  
Tree Mortality ◽  
People’S Republic Of China ◽  
People's Republic Of China ◽  
Trap Catch ◽  
Forest Pests ◽  
Republic Of China ◽  
Dendroctonus Valens ◽  
Pinus Tabuliformis ◽  
Volatile Blend ◽  
And Control

AbstractThe introduced red turpentine beetle, Dendroctonus valens LeConte, is one of the most economically important forest pests in the People's Republic of China, having killed more than 6 million pines in recent years. There is an urgent need to develop effective behavioral chemicals to monitor and control D. valens in the People's Republic of China, as well as in its native range in North America. We tested host kairomones as a 1:1:1 blend of α-pinene, β-pinene, and Δ-3-carene (releasing in the same proportions) for monitoring D. valens populations in the People's Republic of China. We also tested two release systems of verbenone for protection of Pinus tabuliformis Lawson from D. valens attack: (1) polyethylene bubblecaps (BCs) filled with 800 mg of nearly pure verbenone (releasing 18 mg/tree per day) and (2) a sprayable water suspension of microencapsulated (MEC) verbenone (releasing about 100 mg/tree per day). The host-volatile blend trapped substantial numbers of both sexes of adult beetles, up to 15 beetles per day, proving its potential for monitoring. Both of the verbenone release systems significantly reduced D. valens trap catch, and there was no difference between the BC treatment and the MEC treatment. Both release systems also reduced beetle attack on trees to the same level as unbaited controls, from a mean of 5.1 per tree to a mean of 0.7 per tree (for both release systems), suggesting that the treatments may also reduce tree mortality.

scholarly journals Gut Bacterial Communities of Dendroctonus valens and D. mexicanus (Curculionidae: Scolytinae): A Metagenomic Analysis across Different Geographical Locations in Mexico

2018 ◽  
Vol 19 (9) ◽  
pp. 2578 ◽  
Author(s):  
Juan Hernández-García ◽  
Roman Gonzalez-Escobedo ◽  
Carlos Briones-Roblero ◽  
Claudia Cano-Ramírez ◽  
Flor Rivera-Orduña ◽  
...  
Keyword(s):  
Central America ◽  
Bacterial Communities ◽  
Metabolic Pathways ◽  
Bark Beetles ◽  
Geographic Distance ◽  
Phylogenetic Distance ◽  
The Core ◽  
Dendroctonus Valens ◽  
Β Diversity ◽  
Geographical Locations

Dendroctonus bark beetles are a worldwide significant pest of conifers. This genus comprises 20 species found in North and Central America, and Eurasia. Several studies have documented the microbiota associated with these bark beetles, but little is known regarding how the gut bacterial communities change across host range distribution. We use pyrosequencing to characterize the gut bacterial communities associated with six populations of Dendroctonus valens and D. mexicanus each across Mexico, determine the core bacteriome of both insects and infer the metabolic pathways of these communities with Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt) to evaluate whether these routes are conserved across geographical locations. Our results show that the β-diversity with UniFrac unweighted varies among locations of both bark beetles mainly due to absence/presence of some rare taxa. No association is found between the pairwise phylogenetic distance of bacterial communities and geographic distance. A strict intraspecific core bacteriome is determined for each bark beetle species, but these cores are different in composition and abundance. However, both bark beetles share the interspecific core bacteriome recorded previously for the Dendroctonus genus consisting of Enterobacter, Pantoea, Providencia, Pseudomonas, Rahnella, and Serratia. The predictions of metabolic pathways are the same in the different localities, suggesting that they are conserved through the geographical locations.

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