Nematode has potential to reduce cotton yields by 50 percent

Nematode has potential to reduce cotton yields by 50 percent
Trial plot containing Croplan 3885 B2XF cultivar 43 days after planting in 2018. The left two rows shown in the picture are the cultivar planted without the application of a nematicide. The right two rows were treated with an in-furrow spray of Velum Total (1.02 liters/ha) at the time of planting. Credit: Kathy Lawrence

The reniform nematode is one of the most commonly found pests of cotton, with the ability to cause severe economic damage. In order to assess exactly how much damage the reniform nematode can cause, plant pathologists at Auburn University conducted a field trial comparing a clean field to a reniform-infested field.

To get the most , the plant pathologists began with one field experiencing the same conditions, including and irrigation system. They then split the field in half, leaving a 10-foot grass strip in the center, and inoculated one side with the reniform nematode and left the other half clean. They planted ten cotton varieties on each half. They found that, averaged over two years, the cotton yields were 50 percent lower in the reniform field compared to the clean field.

They also experimented with the nematicide Velum Total and found it to be effective dependent on the environment. The nematicide supported a 55 percent increase in yield in 2017 but only 6 percent in 2018, in part due to the dry spring.

"This trial is unique because we can test varieties and nematicides with and without the reniform nematode under almost identical conditions in the field. We can truly measure the reniform nematode effect on yield and the real benefit of the nematicide," said Kathy Lawrence, one of the involved in the study.

Lawrence advises growers to be careful not to allow the reniform to establish in their fields. If they do discover nematodes, they should wash their equipment before moving to a clean field to prevent transfer.


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More information: David R. Dyer et al, Yield Loss of Cotton Cultivars Due to Rotylenchulus reniformis and the Added Benefit of a Nematicide, Plant Health Progress (2020). DOI: 10.1094/PHP-10-19-0073-RS
Provided by American Phytopathological Society
Citation: Nematode has potential to reduce cotton yields by 50 percent (2020, July 7) retrieved 3 August 2020 from https://phys.org/news/2020-07-nematode-potential-cotton-yields-percent.html
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