Can Indirect Herbicide Exposure Modify the Response of the Colorado Potato Beetle to an Organophosphate Insecticide?

2019 ◽  
Vol 112 (5) ◽  
pp. 2316-2323 ◽  
Author(s):  
Aigi Margus ◽  
Miia Rainio ◽  
Leena Lindström
Keyword(s):  
Colorado Potato Beetle ◽  
Target Genes ◽  
Multiple Stressors ◽  
Synergistic Effects ◽  
Oxidative Status ◽  
Interactive Effects ◽  
Invasive Pest ◽  
Lipid Hydroperoxides ◽  
Organophosphate Insecticide ◽  
Potato Beetle

AbstractOrganisms live in complex multivariate environments. In agroecosystems, this complexity is often human-induced as pest individuals can be exposed to many xenobiotics simultaneously. Predicting the effects of multiple stressors can be problematic, as two or more stressors can have interactive effects. Our objective was to investigate whether indirect glyphosate-based herbicide (GBH) exposure of the host plant has interactive effects in combination with an insecticide (azinphos-methyl) on an invasive pest Colorado potato beetle (Leptinotarsa decemlineata Say). We tested the effects of GBH and insecticide on the survival, insecticide target genes expression (acetylcholinesterase genes) and oxidative status biomarkers (glutathione S-transferase [GST], glucose-6-phosphate dehydrogenase [G6PDH], glutathione reductase homolog [GR], glutathione peroxidase homolog [GPx], total glutathione [totGSH], glutathione reduced-oxidized [GSH: GSSG], catalase [CAT], superoxide dismutase [SOD], lipid hydroperoxides). We found that exposure to indirect GBH has no single or interactive effects in combination with the insecticide on larval survival. However, prior exposure to GBH inhibits Ldace1 gene expression by 0.55-fold, which is the target site for the organophosphate and carbamate insecticides. This difference disappears when individuals are exposed to both GBH and insecticide, suggesting an antagonistic effect. On the other hand, oxidative status biomarker scores (PCAs of GPx, GR, and CAT) were decreased when exposed to both stressors, indicating a synergistic effect. Overall, we found that indirect GBH exposure can have both antagonistic and synergistic effects in combination with an insecticide, which should be considered when aiming for an ecologically relevant risk assessment of multiple human-induced stressors.

Interactive Effects of an Antifeedant Used with Bacillus thuringiensis var. san diego Delta Endotoxin on Colorado Potato Beetle (Coleoptera: Chrysomelidae

1993 ◽  
Vol 86 (6) ◽  
pp. 1793-1801 ◽  
Author(s):  
Kathleen D. Murray ◽  
Randall A. Alford ◽  
Eleanor Groden ◽  
Francis A. Drummond ◽  
Richard H. Storch ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
Colorado Potato Beetle ◽  
San Diego ◽  
Interactive Effects ◽  
Potato Beetle ◽  
Delta Endotoxin

scholarly journals AFLP-Based Genetic Linkage Map of the Colorado Potato Beetle Leptinotarsa decemlineata: Sex Chromosomes and a Pyrethroid-Resistance Candidate Gene

Genetics ◽  
2001 ◽  
Vol 158 (2) ◽  
pp. 695-700 ◽  
Author(s):  
David J Hawthorne
Keyword(s):  
Candidate Gene ◽  
Linkage Map ◽  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Genetic Linkage ◽  
Genetic Linkage Map ◽  
Sex Chromosome ◽  
Pyrethroid Resistance ◽  
Codominant Markers ◽  
Potato Beetle

Abstract A genetic linkage map was constructed from an intraspecific cross of the Colorado potato beetle, Leptinotarsa decemlineata. This is an initial step toward mapping the loci that underlie important phenotypes associated with insect adaptation to an agroecosystem. The map was made with 172 AFLP and 10 anonymous codominant markers segregating among 74 backcross (BC1) individuals. Markers were mapped to 18 linkage groups and a subset of the markers with a mean intermarker distance of 11.1 cM is presented. A pyrethroid-resistance candidate gene, LdVssc1, was placed onto the map as well. The sex chromosome was identified by exploiting the XO nature of sex determination in this species using patterns of variation at LdVssc1 and the codominant markers.

scholarly journals Field Efficacy of Steinernema sp. (Rhabditida: Steinernematidae) on the Colorado Potato Beetle Overwintering Generation

Plants ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1464
Author(s):  
Maja Čačija ◽  
Renata Bažok ◽  
Majda Kolenc ◽  
Tena Bujas ◽  
Zrinka Drmić ◽  
...  
Keyword(s):  
Colorado Potato Beetle ◽  
First Generation ◽  
Control Measures ◽  
Recommended Dose ◽  
Steinernema Feltiae ◽  
First Year ◽  
Potato Beetle ◽  
Field Efficacy ◽  
Second Year ◽  
Economic Pest

Colorado potato beetle (CPB) is an economic pest of potato that has developed resistance to all classes of chemical insecticides, thus requiring alternative control measures. As a potential solution, entomopathogenic nematodes (EPNs) have proven effective in suppressing this pest, but their efficacy against overwintering generations of CPB in Croatia has not been sufficiently researched. The aim of this two-year (2018–2019) field study was to determine the efficacy of Steinernema feltiae and Steinernema carpocapsae applied to overwintering CPB adults. EPNs were applied at three doses (7.5 mil./10 m2, 5.0 mil./10 m2 (the recommended dose) and 2.5 mil./10 m2) by watering the soil where the adults were overwintering. The first-year results were satisfactory for both EPNs: the efficacy of S. feltiae ranged from 79.03% to 100.00%, while the efficacy of S. carpocapsae ranged from 77.32% to 96.22%. In the second year, the highest efficacy (69.57%) was obtained using the recommended dose of S. feltiae. Although the results are not consistent across the two years of our study and suggest further research, they indicate that EPNs have great potential in controlling overwintering CPB generations to reduce first generation abundance and damage, and also to prevent the spread of new generations to surrounding potato growing areas.

scholarly journals Intersections Of Neighborhood Co-Ethnic Density and Nativity Status On Heavy Drinking In a General Population Sample Of US Latinos and Asians

2020 ◽  
Vol 56 (1) ◽  
pp. 74-81
Author(s):  
Christina C Tam ◽  
Camillia K Lui ◽  
Katherine J Karriker-Jaffe
Keyword(s):  
Synergistic Effects ◽  
Population Sample ◽  
Heavy Drinking ◽  
Heavy Episodic Drinking ◽  
Interactive Effects ◽  
California Health Interview Survey ◽  
Protective Effects ◽  
Foreign Born ◽  
Ethnic Density ◽  
Nativity Status

Abstract Aims Greater neighborhood co-ethnic density (living in proximity with people sharing an ethnicity) and being foreign-born each can protect against risky drinking, but little is known about whether these two factors interact. Using a representative sample of Latinos and Asians from California, USA, we investigate main and interactive effects of neighborhood co-ethnic density and nativity status in relation to heavy episodic drinking (HED). Methods This study uses the California Health Interview Survey (N = 30,203) linked with neighborhood data to investigate associations of co-ethnic density and nativity status with HED. Co-ethnic density was based on matching each respondent’s ethnicity to the proportion of residents of the corresponding group in their Census tract. Using weighted logistic regression, we first examined main effects of neighborhood co-ethnic density and respondent nativity status on HED. Next, we assessed the interaction of co-ethnic density and nativity status. Finally, we estimated nativity-stratified models to investigate variation in effects of co-ethnic density. Results Co-ethnic density was not associated with HED for the full sample, but US-born nativity status was associated with increased odds of past-year HED. The interaction model showed co-ethnic density and nativity had synergistic effects, whereby greater levels of neighborhood co-ethnic density buffered risk associated with being US-born. Further, greater neighborhood co-ethnic density was associated with reduced odds of HED for US-born respondents, but it was not associated with HED for foreign-born respondents. Conclusions Protective effects of high neighborhood co-ethnic density on HED are stronger for US-born than for foreign-born Latinos and Asians in California.

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