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Examining the Competitive Advantage of Diuraphis noxia (Hemiptera: Aphididae) Biotype 2 Over Biotype 1
| Content Provider | Semantic Scholar |
|---|---|
| Author | Merrill, Scott C. Randolph, Terri L. Peairs, Frank B. Michels, Gerald J. Walker, Cynthia B. |
| Copyright Year | 2014 |
| Abstract | ABSTRACT The Russian wheat aphid, Diuraphis noxia (Kurdjumov) is a serious pest of small grains, such as wheat and barley. High population growth rates and a broad gramineae host range have allowed this aphid to successfully establish and become pestiferous across much of North America since its invasion in the mid-1980s. Resistant wheat cultivars were developed and provided control of D. noxia until 2003, when a new biotype (designated RWA2, as contrasted with the original biotype’s designation, RWA1) emerged and rapidly spread through dryland winter wheat-growing regions. RWA2 displaced RWA1 more quickly than expected, based on RWA2’s advantage in RWA1-resistant wheat cultivars. Previous research suggested that RWA2 may out-compete RWA1 in cooler temperatures. Thus, we sought to determine if RWA2 had a competitive advantage over RWA1 during the overwintering period. We placed a known distribution of RWA1 and RWA2 aphids in the field for the winter at three sites across a latitudinal gradient (from northern Colorado to Texas) to test for a competitive advantage between these biotypes. We found overwhelming support for an overwintering competitive advantage by RWA2 over RWA1, with evidence suggesting a >10-fold advantage even at our Texas site (i.e., the site with the mildest winter). This substantial overwintering advantage helps explain the quick dispersion and displacement of RWA1 by RWA2. |
| Starting Page | 1471 |
| Ending Page | 1475 |
| Page Count | 5 |
| File Format | PDF HTM / HTML |
| DOI | 10.1603/EC13557 |
| PubMed reference number | 25195438 |
| Journal | Medline |
| Volume Number | 107 |
| Alternate Webpage(s) | https://segs.w3.uvm.edu/sites/default/files/~segs/Merrill%20et%20al.%202014.pdf |
| Alternate Webpage(s) | https://doi.org/10.1603/EC13557 |
| Journal | Journal of economic entomology |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
