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Yield Loss of Cotton Cultivars Due to Rotylenchulus reniformis and the Added Benefit of a Nematicide

D. R. Dyer, W. Groover, and K. S. Lawrence

April 2020

Research

The objective was to determine cotton yield loss due to Rotylenchulus reniformis and document any yield benefit from the addition of a nematicide. Field trials were established in two adjacent fields: one infested with R. reniformis and one where R. reniformis was not detected. In both fields, seven cotton cultivars were planted with and without Velum Total (1.02 liters/ha). In 2017, R. reniformis reduced cultivar yields by an average of 59% between the noninfested and the R. reniformis-infested field. The nematicide application increased seed cotton yields in the R. reniformis field by 55%, and no yield increase was observed in the noninfested field. In 2018, R. reniformis reduced seed cotton yields by an average of 42% between the noninfested field and the R. reniformis-infested field. Across the cultivars, addition of the nematicide increased seed cotton yields by an average of 6% in the R. reniformis-infested field and an average of 8% in the noninfested field. The nematicide reduced R. reniformis eggs per gram of root by an average of 92% in 2017 and 78% in 2018 across all cotton cultivars. Overall, R. reniformis reduced seed cotton yields by 50%, which was equivalent to 2,225 kg/ha.

doi:10.1094/PHP-10-19-0073-RS

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