Economics Versus Alleles: Balancing Integrated Pest Management and Insect Resistance Management for Rotation-Resistant Western Corn Rootworm (Coleoptera: Chrysomelidae)

2003 ◽  
Vol 96 (6) ◽  
pp. 1872-1885 ◽  
Author(s):  
D. W. Onstad ◽  
D. W. Crowder ◽  
P. D. Mitchell ◽  
C. A. Guse ◽  
J. L. Spencer ◽  
...  
Keyword(s):  
Integrated Pest Management ◽  
Pest Management ◽  
Insect Resistance ◽  
Resistance Management ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
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 Survey of bacteria associated with western corn rootworm life stages reveals no difference between insects reared in different soils

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Dalton C. Ludwick ◽  
Aaron C. Ericsson ◽  
Lisa N. Meihls ◽  
Michelle L. J. Gregory ◽  
Deborah L. Finke ◽  
...  
Keyword(s):  
Pest Management ◽  
Life Stage ◽  
Management Strategies ◽  
Diabrotica Virgifera Virgifera ◽  
Western Corn Rootworm ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Corn Rootworm ◽  
Life Stages ◽  
Different Soils

Abstract Western corn rootworm (Diabrotica virgifera virgifera LeConte) is a serious pest of maize (Zea mays L.) in North America and parts of Europe. With most of its life cycle spent in the soil feeding on maize root tissues, this insect is likely to encounter and interact with a wide range of soil and rhizosphere microbes. Our knowledge of the role of microbes in pest management and plant health remains woefully incomplete, yet that knowledge could play an important role in effective pest management strategies. For this study, insects were reared on maize in soils from different locations. Insects from two different laboratory colonies (a diapausing and a non-diapausing colony) were sampled at each life stage to determine the possible core bacteriome. Additionally, soil was sampled at each life stage and resulting bacteria were identified to determine the possible contribution of soil to the rootworm bacteriome, if any. We analyzed the V4 hypervariable region of bacterial 16S rRNA genes with Illumina MiSeq to survey the different species of bacteria associated with the insects and the soils. The bacterial community associated with insects was significantly different from that in the soil. Some differences appear to exist between insects from non-diapausing and diapausing colonies while no significant differences in community composition existed between the insects reared on different soils. Despite differences in the bacteria present in immature stages and in male and female adults, there is a possible core bacteriome of approximately 16 operational taxonomic units (i.e., present across all life stages). This research may provide insights into Bt resistance development, improved nutrition in artificial rearing systems, and new management strategies.

scholarly journals Regulating insect resistance management: the case of non-Bt corn refuges in the US

2005 ◽  
Vol 76 (3) ◽  
pp. 210-220 ◽  
Author(s):  
Denis Bourguet ◽  
Marion Desquilbet ◽  
Stéphane Lemarié
Keyword(s):  
Insect Resistance ◽  
Resistance Management ◽  
Bt Corn ◽  
Insect Resistance Management ◽  
The Us

Adoption of Integrated Pest Management Tactics by Wisconsin Farmers

2006 ◽  
Vol 20 (3) ◽  
pp. 756-767 ◽  
Author(s):  
Clarissa M. Hammond ◽  
Edward C. Luschei ◽  
Chris M. Boerboom ◽  
Pete J. Nowak
Keyword(s):  
Integrated Pest Management ◽  
Pest Management ◽  
Management Practices ◽  
Resistance Management ◽  
Environmental Safety ◽  
Farm Size ◽  
Management Decision ◽  
Dairy Farmers ◽  
Management Decision Making ◽  
Large Farms

Agronomic research and extension personnel generally recognize the benefits of integrated pest management (IPM) but IPM practices have not been rapidly adopted by farmers. In order for applied research and extension programs to be as influential as possible, strategies and tactics must be evaluated in the context of the real-world constraints experienced by farmers. We investigated the linkage between farmers' pest management behaviors, attitudes, and constraints by analyzing an extensive corn pest management survey distributed throughout Wisconsin in 2002. Our objectives were to (1) create a benchmark against which future changes in pest management practices could be detected and (2) explore potential associations between practices and farm characteristics, e.g., farm size or commodity produced. A total of 213 farmers responded with descriptions of their operations; weed, insect, and disease pest management practices; crop consultant usage; interactions with their local agrichemical dealer; and attitudes regarding pest management decision-making. We compared the relative responses of cash-grain and dairy farmers as well as managers of large and small farms. Larger farm size and percentage of operation in cash-grain production were associated with an increased frequency of rotating crops, rotating herbicide families, and use of a broadcast herbicide application. Managers of large farms and/or cash-grain crops also more frequently indicated considering the level of pest control, price, carryover potential, weed resistance management, environmental safety, and risk to the applicator than did dairy or small-sized operations. Cash-grain farmers had significantly higher scores on a calculated IPM index than did dairy farmers (P < 0.0001). We also found a significant positive relationship between farm size and IPM score (P < 0.0001). Our results provide a benchmark for future comparisons of IPM adoption rates in Wisconsin and highlight the association between IPM research/extension and farmers' management behavior.

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