scholarly journals The Impact of Volunteer Corn on Crop Yields and Insect Resistance Management Strategies

Agronomy ◽  
2013 ◽  
Vol 3 (2) ◽  
pp. 488-496 ◽  
Author(s):  
Paul Marquardt ◽  
Ryan Terry ◽  
William Johnson
Keyword(s):  
Insect Resistance ◽  
Crop Yields ◽  
Management Strategies ◽  
Resistance Management ◽  
Insect Resistance Management ◽  
Volunteer Corn ◽  
The Impact

Volunteer Corn Presents New Challenges for Insect Resistance Management

2009 ◽  
Vol 101 (4) ◽  
pp. 797-799 ◽  
Author(s):  
Christian Krupke ◽  
Paul Marquardt ◽  
William Johnson ◽  
Stephen Weller ◽  
Shawn P. Conley
Keyword(s):  
Insect Resistance ◽  
Resistance Management ◽  
Insect Resistance Management ◽  
New Challenges ◽  
Volunteer Corn

Cotton Fleahopper1 Biology and Ecology Relevant to Development of Insect Resistance Management Strategies

2021 ◽  
Vol 46 (1) ◽  
Author(s):  
Kristin Hamons ◽  
Tyler Raszick ◽  
Lindsey Perkin ◽  
Gregory Sword ◽  
Charles Suh
Keyword(s):  
Insect Resistance ◽  
Management Strategies ◽  
Resistance Management ◽  
Insect Resistance Management

scholarly journals Genetic Markers for Western Corn Rootworm Resistance to Bt Toxin

2015 ◽  
Vol 5 (3) ◽  
pp. 399-405 ◽  
Author(s):  
Lex E Flagel ◽  
Shilpa Swarup ◽  
Mao Chen ◽  
Christopher Bauer ◽  
Humphrey Wanjugi ◽  
...  
Keyword(s):  
Genetic Markers ◽  
Insect Resistance ◽  
Management Strategies ◽  
Resistance Management ◽  
The United States ◽  
Western Corn Rootworm ◽  
Economic Losses ◽  
Corn Rootworm ◽  
Insect Resistance Management ◽  
Bt Toxin

Abstract Western corn rootworm (WCR) is a major maize (Zea mays L.) pest leading to annual economic losses of more than 1 billion dollars in the United States. Transgenic maize expressing insecticidal toxins derived from the bacterium Bacillus thuringiensis (Bt) are widely used for the management of WCR. However, cultivation of Bt-expressing maize places intense selection pressure on pest populations to evolve resistance. Instances of resistance to Bt toxins have been reported in WCR. Developing genetic markers for resistance will help in characterizing the extent of existing issues, predicting where future field failures may occur, improving insect resistance management strategies, and in designing and sustainably implementing forthcoming WCR control products. Here, we discover and validate genetic markers in WCR that are associated with resistance to the Cry3Bb1 Bt toxin. A field-derived WCR population known to be resistant to the Cry3Bb1 Bt toxin was used to generate a genetic map and to identify a genomic region associated with Cry3Bb1 resistance. Our results indicate that resistance is inherited in a nearly recessive manner and associated with a single autosomal linkage group. Markers tightly linked with resistance were validated using WCR populations collected from Cry3Bb1 maize fields showing significant WCR damage from across the US Corn Belt. Two markers were found to be correlated with both diet (R2 = 0.14) and plant (R2 = 0.23) bioassays for resistance. These results will assist in assessing resistance risk for different WCR populations, and can be used to improve insect resistance management strategies.

scholarly journals Cytochrome P450 metabolic resistance (CYP6P9a) to pyrethroids imposes a fitness cost in the major African malaria vector Anopheles funestus

Heredity ◽  
2020 ◽  
Vol 124 (5) ◽  
pp. 621-632 ◽  
Author(s):  
Magellan Tchouakui ◽  
Jacob Riveron Miranda ◽  
Leon M. J. Mugenzi ◽  
Doumani Djonabaye ◽  
Murielle J. Wondji ◽  
...  
Keyword(s):  
Malaria Vector ◽  
Management Strategy ◽  
Management Strategies ◽  
Resistance Management ◽  
Anopheles Funestus ◽  
Fitness Cost ◽  
Malaria Vectors ◽  
Hybrid Strain ◽  
Metabolic Resistance ◽  
The Impact

Abstract Metabolic resistance threatens the sustainability of pyrethroid-based malaria control interventions. Elucidating the fitness cost and potential reversal of metabolic resistance is crucial to design suitable resistance management strategies. Here, we deciphered the fitness cost associated with the CYP6P9a (P450-mediated metabolic resistance) in the major African malaria vector Anopheles funestus. Reciprocal crosses were performed between a pyrethroid susceptible (FANG) and resistant (FUMOZ-R) laboratory strains and the hybrid strains showed intermediate resistance. Genotyping the CYP6P9a-R resistance allele in oviposited females revealed that CYP6P9a negatively impacts the fecundity as homozygote susceptible mosquitoes (CYP6P9a-SS) lay more eggs than heterozygote (OR = 2.04: P = 0.01) and homozygote resistant mosquitoes. CYP6P9a also imposes a significant fitness cost on the larval development as homozygote resistant larvae (CYP6P9a-RR) developed significantly slower than heterozygote and homozygote susceptible mosquitoes (χ2 = 11.2; P = 0.0008). This fitness cost was further supported by the late pupation of homozygote resistant than susceptible mosquitoes (OR = 2.50; P < 0.01). However, CYP6P9a does not impact the longevity as no difference was observed in the life span of mosquitoes with different genotypes (χ2 = 1.6; P = 0.9). In this hybrid strain, a significant decrease of the resistant CYP6P9a-RR genotype was observed after ten generations (χ2 = 6.6; P = 0.01) suggesting a reversal of P450-based resistance in the absence of selection. This study shows that the P450-mediated metabolic resistance imposes a high fitness cost in malaria vectors supporting that a resistance management strategy based on rotation could help mitigate the impact of such resistance.

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