SCN Females Now Visible on Soybean Roots

cysts-nodules
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The first generation of soybean cyst nematode (SCN) females is now visible on the roots of soybeans growing in SCN-infested fields in Iowa. The SCN females, which contain 250 or more eggs each, are white and about the size of a period at the end of a printed sentence (Fig. 1). The females are much smaller and lighter in color than nitrogen-fixing nodules, which are the color of the roots.

icmn-fig1

Figure 1. Adult SCN females (small, white objects) on the roots of a resistant soybean cultivar.

Digging roots (not pulling) and closely looking for SCN females is a simple, yet effective, way to check fields for the presence of SCN.

Unfortunately, resistance-breaking populations of SCN are somewhat common in Iowa and throughout the Midwest these days. Checking the roots of SCN-resistant soybean cultivars for SCN females is a good way to gauge if the resistant cultivars are not controlling the nematode. Seeing a few SCN females on the roots of a resistant soybean plant would not be cause for great concern.

Dig and look at roots from multiple places throughout various parts of the field. If SCN hasn’t been found in a field previously, high risk areas for initial infestation of fields include near the field entryway, in low spots, and along fence lines where windblown soil accumulates (Fig. 2).

icmn-fig-2

Figure 2. Areas in a field where infestations of SCN may likely be found first.

More information about the biology and management of SCN is available at www.soybeancyst.info andwww.soybeanresearchinfo.com.

 

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