Effects of Clariva Complete Beans Seed Treatment on Heterodera glycines Reproduction and Soybean Yield in Iowa

In recent years, nematode-protectant seed treatments have become available to supplement resistant soybean cultivars to manage soybean cyst nematode (Heterodera glycines; SCN). Twenty-seven small-plot and 18 strip-trial experiments were conducted comparing the effects of Clariva Complete Beans (CCB) and CruiserMaxx Advanced plus Vibrance (CMV) on SCN reproduction and soybean yield on a moderately resistant (2014) and resistant (2015 to 2016) soybean cultivar. Yield data were collected, and an SCN reproductive factor was calculated by dividing final (at harvest) SCN egg population densities by initial (at planting) population densities from soil samples collected in each small plot or sampled area in the strip trials. Relative to the CMV treatment, CCB significantly decreased SCN reproductive factor in two small-plot experiments (one each in 2014 and 2015) but not in any of the strip trials in any year. Soybean yields were significantly greater with CCB versus CMV in 5 of the 18 strip trials but not in any of the small-plot experiments, even when there were significant decreases in SCN reproduction. For unknown reasons, CCB significantly decreased yields in two small-plot experiments and at one strip-trial location. In summary, the effects of CCB seed treatment on SCN reproduction and soybean yields were variable in the years that these experiments were conducted in Iowa.

[1]  J. M. Ferris,et al.  An Efficient New Device to Release Eggs From Heterodera glycines. , 2000, Journal of nematology.

[2]  M. Hommel.  Biological Control of Plant Parasitic Nematodes: Progress, Problems and Prospects , 1992 .

[3]  W. Wergin,et al.  Light and electron microscopical study of a bacterial parasite from the cyst nematode, Heterodera glycines. , 1991 .

[4]  R. Berka,et al.  From the Lab to the Farm: An Industrial Perspective of Plant Beneficial Microorganisms , 2016, Front. Plant Sci..

[5]  G. Gertner,et al.  Population Changes in Heterodera glycines and Its Bacterial Parasite Pasteuria sp. in Naturally Infested Soil. , 1998, Journal of nematology.

[6]  G. Munkvold.  Seed pathology progress in academia and industry. , 2009, Annual review of phytopathology.

[7]  G. Smith,et al.  Distribution, Density, and Diversity of Heterodera glycines in Missouri. , 1993, Journal of nematology.

[8]  M. Starr,et al.  Pasteuria thornei sp. nov. and Pasteuria penetrans sensu stricto emend., mycelial and endospore-forming bacteria parasitic, respectively, on plant-parasitic nematodes of the genera Pratylenchus and Meloidogyne. , 1988, Annales de l'Institut Pasteur. Microbiology.

[9]  M. Starr,et al.  Pasteuria penetrans (ex Thorne, 1940) nom. rev., comb. n., sp. n., a mycelial and endospore-forming bacterium parasitic in plant-parasitic nematodes , 1985 .

[10]  T. G.L.,et al.  A Revised Classification Scheme for Genetically Diverse Populations of Heterodera glycines , 2003 .

[11]  P. Marrone.  The Market and Potential for Biopesticides , 2014 .

[12]  Z. Siddiqui,et al.  Role of bacteria in the management of plant parasitic nematodes: A review , 1999 .

[13]  J. Lauer,et al.  Corn and Soybean Yield Response to Tillage, Rotation, and Nematicide Seed Treatment , 2017 .

[14]  Adam P. Gaspar,et al.  Soybean Seed Yield Response to Multiple Seed Treatment Components across Diverse Environments , 2014 .

[15]  J. O. Becker,et al.  'Candidatus pasteuria usgae' sp. nov., an obligate endoparasite of the phytoparasitic nematode Belonolaimus longicaudatus. , 2003, International journal of systematic and evolutionary microbiology.

[16]  D. Mueller,et al.  Differences in Small Plot and On-Farm Trials for Yield Response to Foliar Fungicide in Soybean. , 2018, Plant Disease.

[17]  A. Ciancio.  Density-dependent parasitism of Xiphinema diversicaudatum by Pasteuria penetrans in a naturally infested field. , 1995 .

[18]  M. Moosavi,et al.  Significance of biocontrol agents of phytonematodes. , 2015 .

[19]  W. Wergin,et al.  Pasteuria nishizawae sp. nov., a mycelial and endospore-forming bacterium parasitic on cyst nematodes of genera Heterodera and Globodera. , 1991, Research in microbiology.

[20]  J. Gerdemann.  Relation of a Large Soil-Borne Spore to Phycomycetous Mycorrhizal Infections , 1955 .