Journal of Nematology (2014) 46, 365-375

Drew W. Schrimsher, Kathy S. Lawrence, Roelof B. Sikkens and David B. Weaver (2014)
Nematicides enhance growth and yield of Rotylenchulus reniformis resistant cotton genotypes
Journal of Nematology 46 (4), 365-375
Abstract: Rotylenchulus reniformis resistant LONREN-1xFM966 breeding lines developed at Auburn University have demonstrated that the nematode resistance is accompanied by severe stunting, limited growth, and low yields. The objectives of this study were to evaluate the effects of applying nematicides to selected LONREN breeding lines on R. reniformis nematode populations, plant stunting, and yield. Four resistant breeding lines from the LONREN-1xFM966 cross, one susceptible line from the LONREN- 1xFM966 cross, as well as LONREN-1, BARBREN-713, and the susceptible cultivar DP393 were evaluated with and without nematicides in the presence of R. reniformis. In the greenhouse, nematicides increased plant height across all genotypes compared with no nematicide. Rotylenchulus reniformis populations were 50% lower in the resistant lines compared with the susceptible lines at 45 days after planting (DAP). In microplot and field trials, the phenotypic stunting of all genotypes was reduced by aldicarb with increases in plant heights at 30 and 75 DAP. Increases in yields were evident across all genotypes treated with aldicarb. In all three trial environments, BARBREN-713 outperformed the LONREN-derived lines as well as 'DP393' in seed cotton yields, while having significantly lower R. reniformis egg densities than the susceptible genotypes.
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Database assignments for author(s): Kathy S. Lawrence, David B. Weaver

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Rotylenchulus reniformis	Cotton (Gossypium)	U.S.A. (SE)