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Kate Turner A, Graham SH, Potnis N, Brown SM, Donald P, Lawrence KS. Evaluation of Meloidogyne Incognita and Rotylenchulus Reniformis Nematode-resistant Cotton Cultivars with Supplemental Corteva Agriscience Nematicides. J Nematol 2023; 55:20230001. [PMID: 36880012 PMCID: PMC9984807 DOI: 10.2478/jofnem-2023-0001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Indexed: 02/18/2023] Open
Abstract
Meloidogyne incognita- and Rotylenchulus reniformis-resistant new cotton cultivars have recently become available, giving growers a new option in nematode management. The objectives of this study were: (i) to determine the yield potential of the new cultivars PHY 360 W3FE (M. incognita-resistant) and PHY 332 W3FE (R. reniformis-resistant) in nematode-infested fields and (ii) to evaluate the effects of combining the nematicides Reklemel (fluazaindolizine), Vydate C-LV (oxamyl), and the seed treatment BIOST Nematicide 100 (heat killed Burkholderia rinojenses and its non-living spent fermentation media) with resistant cotton cultivars on nematode population levels and lint yield. Field experiments in 2020 and 2021 indicated M. incognita population levels were 73% lower on PHY 360 W3FE (R) and 80% lower for R. reniformis on the PHY 332 W3FE (R) at 40 days after planting. Nematode eggs per gram of root were further reduced an average of 86% after the addition of Reklemel and Vydate C-LV when averaging both cultivars over the two years. Tests with BIOST Nematicide 100 + Reklemel + Vydate C-LV (0.56 + 2.5 L/ha) in both M. incognita and R. reniformis fields produced higher lint yields. Overall, planting PHY 360 W3FE (R) and PHY 332 W3FE (R) improved yields an average of 364 kg/ha while limiting nematode population increases. The addition of the nematicides further increased yields 152 kg/ha of the nematode-resistant cultivars.
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Affiliation(s)
- A. Kate Turner
- 559 Devall Dr. CASIC Building, Auburn Univ, AL 36849AlabamaUnited States
| | | | - Neha Potnis
- 209 Life Science Building, Auburn Univ, AL 36849AlabamaUnited States
| | - Steve M. Brown
- 249 Funchess Hall Auburn Univ, AL 36849AlabamaUnited States
| | - Pat Donald
- 559 Devall Dr. CASIC Building, Auburn Univ, AL 36849AlabamaUnited States
| | - Kathy S. Lawrence
- 559 Devall Dr. CASIC Building, Auburn Univ, AL 36849AlabamaUnited States
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Faske TR, Kandel Y, Allen TW, Grabau ZJ, Hu J, Kemerait RC, Lawrence GW, Lawrence KS, Mehl HL, Overstreet C, Thiessen LD, Wheeler T. Meta-Analysis of the Field Efficacy of Seed- and Soil-Applied Nematicides on Meloidogyne incognita and Rotylenchulus reniformis Across the U.S. Cotton Belt. PLANT DISEASE 2022; 106:2228-2238. [PMID: 34978874 DOI: 10.1094/pdis-07-21-1529-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Meta-analysis was used to compare yield protection and nematode suppression provided by two seed-applied and two soil-applied nematicides against Meloidogyne incognita and Rotylenchulus reniformis on cotton across 3 years and several trial locations in the U.S. Cotton Belt. Nematicides consisted of thiodicarb- and fluopyram-treated seed, aldicarb and fluopyram applied in furrow, and combinations of the seed treatments and soil-applied fluopyram. The nematicides had no effect on nematode reproduction or root infection but had a significant impact on seed cotton yield response ([Formula: see text]), with an average increase of 176 and 197 kg/ha relative to the nontreated control in M. incognita and R. reniformis infested fields, respectively. However, because of significant variation in yield protection and nematode suppression by nematicides, five or six moderator variables (cultivar resistance [M. incognita only], nematode infestation level, nematicide treatment, application method, trial location, and growing season) were used depending on nematode species. In M. incognita-infested fields, greater yield protection was observed with nematicides applied in furrow and with seed-applied + in-furrow than with solo seed-applied nematicide applications. Most notable of these in-furrow nematicides were aldicarb and fluopyram (>131 g/ha) with or without a seed-applied nematicide compared with thiodicarb. In R. reniformis-infested fields, moderator variables provided no further explanation of the variation in yield response produced by nematicides. Furthermore, moderator variables provided little explanation of the variation in nematode suppression by nematicides in M. incognita- and R. reniformis-infested fields. The limited explanation by the moderator variables on the field efficacy of nematicides in M. incognita- and R. reniformis-infested fields demonstrates the difficulty of managing these pathogens with nonfumigant nematicides across the U.S. Cotton Belt.
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Affiliation(s)
- Travis R Faske
- Department of Entomology and Plant Pathology, University of Arkansas System Division of Agriculture, Lonoke Extension Center, Lonoke, AR 72086
| | - Yuba Kandel
- Department of Plant Pathology, Iowa State University, Ames, IA 50011
| | - Tom W Allen
- Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
| | - Zane J Grabau
- Entomology and Nematology Department, University of Florida, Gainesville, FL 32611
| | - Jiahuai Hu
- School of Plant Sciences, University of Arizona, Tucson, AZ 85721
| | - Robert C Kemerait
- Department of Plant Pathology, University of Georgia, Tifton, GA 31793
| | - Gary W Lawrence
- Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, Mississippi State, MS 39762
| | - Kathy S Lawrence
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL 36849
| | - Hillary L Mehl
- Tidewater Agricultural Research and Extension Center, Virginia Tech, Suffolk, VA 23437
| | - Charles Overstreet
- Department of Plant Pathology and Crop Physiology, Louisiana State University AgCenter, Baton Rouge, LA 70803
| | - Lindsey D Thiessen
- Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695
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Effects of Fusarium wilt on Cotton Cultivars with and Without Meloidogyne incognita Resistance in Fields. J Nematol 2022; 54:20220017. [PMID: 36120511 PMCID: PMC9442625 DOI: 10.2478/jofnem-2022-0017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Indexed: 11/21/2022] Open
Abstract
Abstract
Cotton (Gossypium hirsutum) cultivar trials were conducted in four fields (6 trials total) with Meloidogyne incognita (Mi)/Fusarium oxysporum f. sp. vasinfectum (Fov) from 2019 to 2021. Cotton cultivars were divided into groups based on company/Mi resistance: S = susceptible to Mi; R-FM, R-DP, and R-PHY = resistance to Mi in FiberMax®, Deltapine®, and Phytogen® cultivars, respectively; ST 4946GLB2 (moderate resistance to Mi and observed field tolerance to Fov); and ST 5600B2XF (resistance to Mi). The S and R-FM groups had the highest transformed Mi densities LOG10(Mi + 1) (LMi = 3.22 and 3.01, respectively), while R-DP and R-PHY had the lowest LMi (2.21 and 1.85, respectively). Plant mortality (%) was higher for R-DP (28.1%) than for all other groups except ST 5600B2XF (24.8%). Mi-susceptible cultivars averaged 23.3% mortality. Relative yield (0-1 scale) was higher for ST 4946GLB2 (0.706) and R-PHY (0.635) than for R-DP (0.530), ST 5600B2XF (0.578), and S (0.491). All groups except R-DP averaged higher relative yield than the susceptible cultivars. ST 4946GLB2 had the lowest mortality (16.5%) and highest relative yield, while R-DP cultivars had the highest mortality and no difference in relative yield from the Mi-susceptible cultivars. The group of R-DP cultivars had excellent Mi resistance but were susceptible to Fov. No cultivars were identified with high resistance to Fov.
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