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Soybean Nematodes

Posted by romeethredge on November 24, 2012

These guys with UGA Plant pathology were here last week doing a nematode survey in soybean fields. This survey was done across Georgia last year, including Seminole county last year as well and I have below Dr. Kemerait’s report concerning nematodes in the 2012 Soybean production guide.

 Dr. Bob Kemerait, UGA Extension Plant Pathologist, says that now is the time to sample crop fields for nematodes.

Nematodes are an important threat to soybean production in Georgia. Soybean yields in the state are routinely compromised by root-knot, reniform, Columbia lance nematodes, and perhaps sting and cyst nematodes as well. From a survey of 107 soybean fields from across Georgia, root-knot nematodes were present in at least 36 fields, cysts nematodes in ten fields and reniform nematodes in five fields. The root-knot nematodes were found in fields across the state; cyst and reniform were found in much more localized areas. For example, cyst nematodes were found most commonly in Washington, Burke, and Screven Counties; reniform nematodes in Calhoun and Sumter Counties.

The first line of defense for protection from plant-parasitic nematodes is crop rotation; however crop rotation is difficult for management of nematodes that affect soybeans. This is because one or more of the important nematodes affecting soybeans will also affect most of our suitable rotation crops (e.g. cotton, corn, and peanuts). The second line of defense will be the use of soybean varieties with some level of nematode resistance. Though none of our soybean varieties are immune to nematodes, growers can plant varieties with improved resistance to the cyst and root-knot nematodes. This resistance, as a part of an over-all nematode management plan, will help to minimize losses in yield and also reduce nematode populations in a field compared to populations when a susceptible variety is planted. The third line of defense in management of nematodes on soybeans is the use of appropriate nematicides. Currently most growers who apply a nematicide to their soybean crop will use Temik 15G. Unfortunately the supply of Temik 15G will be severely limited in 2012 and the little that is available will be quite expensive. It appears that a new formulation of aldicarb (the active ingredient in Temik 15G) will be available to growers later in 2012 and sold as “Meymik”; however Meymik will not be available in time for planting. Growers have the opportunity to use Telone II (3 gal/A) but supplies for Telone II remain limited in 2012. The seed-treatment nematicide AVICTA Complete Beans from Syngenta is also available to soybean producers. Research continues on AVICTA Complete Beans to develop use recommendations through the University of Georgia Cooperative Extension.

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