PMID: 28512371May 18, 2017Paper

First Report of the Spiral Nematode Helicotylenchus microlobus Infecting Soybean in North Dakota

Journal of Nematology
Guiping YanZ A Handoo

Abstract

Spiral nematodes (Helicotylenchus spp.) are common plant-parasitic nematodes in fields of many crops. In June 2015, two soil samples were collected from a soybean field in Richland County, ND. Nematodes were extracted from soil using the sugar centrifugal flotation method (Jenkins, 1964). Plant-parasitic nematodes were identified to genus based on morphological features and counted. Both samples contained spiral nematodes from 1,500 to 3,300 per kilogram of soil. In June and August 2016, 10 soil samples were collected from the same field. Nematodes were extracted, and nine of the samples had spiral nematodes ranging from 125 to 3,065 per kilogram of soil. One soil sample with 1,500 spiral nematodes per kilogram was used to inoculate two soybean cultivars Sheyenne and Barnes each in four replicates. After 15 wk of growth at 22°C in a greenhouse room, the population of spiral nematodes was found to have increased greatly. The final density was 9,300 ± 1,701 spiral nematodes per kilogram of soil for Sheyenne and 9,451 ± 2,751 for Barnes. The reproductive factor in Sheyenne and Barnes was 6.2 and 6.3, respectively, indicating that this spiral nematode infects and reproduces well on these two soybean cultivars. Infected soybean root...Continue Reading

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