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 Bacillus thuringiensis Delta-Endotoxin Cry1 Hybrid Proteins with Increased Activity against the Colorado Potato Beetle

2001 ◽  
Vol 67 (11) ◽  
pp. 5328-5330 ◽  
Author(s):  
Samir Naimov ◽  
Mieke Weemen-Hendriks ◽  
Stefan Dukiandjiev ◽  
Ruud A. de Maagd
Keyword(s):  
Bacillus Thuringiensis ◽  
Colorado Potato Beetle ◽  
Insect Species ◽  
Hybrid Proteins ◽  
Potato Beetle ◽  
Lepidopteran Insects ◽  
Delta Endotoxin ◽  
Low Levels ◽  
Increased Activity

ABSTRACT Cry1 delta-endotoxins of Bacillus thuringiensis are generally active against lepidopteran insects, but Cry1Ba and Cry1Ia have additional, though low, levels of activity against coleopterans such as the Colorado potato beetle. Here we report the construction of Cry1Ba/Cry1Ia hybrid toxins which have increased activities against this insect species.

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.

Colorado potato beetle chymotrypsin genes are differentially regulated in larval midgut in response to the plant defense inducer hexanoic acid or the Bacillus thuringiensis Cry3Aa toxin

2019 ◽  
Vol 166 ◽  
pp. 107224 ◽  
Author(s):  
María José López-Galiano ◽  
Inmaculada García-Robles ◽  
Víctor Manuel Ruiz-Arroyo ◽  
Sara Sanchís Oltra ◽  
Marko Petek ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
Plant Defense ◽  
Colorado Potato Beetle ◽  
Hexanoic Acid ◽  
Larval Midgut ◽  
Potato Beetle
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