Nematode Management - Louisiana Cotton Production

Daniel Fromme  |  9/12/2016 5:52:17 PM

Several plant-parasitic nematodes are responsible for causing serious losses in Louisiana cotton every year. The nematode losses within any field can range from fairly minor to severe. Unfortunately, many fields sustain fairly significant damage without nematodes being recognized as the cause. Southern root-knot (Meloidogyne incognita) and reniform nematodes (Rotylenchulus reniformis) are responsible for causing most of the nematode problems in cotton.

Unfortunately, many fields sustain fairly significant damage without nematodes being ecognized as the cause. Southern root-knot (Meloidogyne incognita) and reniform nematodes (Rotylenchulus reniformis) are responsible for causing most of the nematode problems in cotton.

Symptoms of reniform nematodes are much like those observed with Southern root-knot. Plants can be stunted, slow growing, smaller bolls, delayed maturity and low yielding (Figures 4, 5 and 6). The major difference is the absence of galls (Figure 7). It is difficult to identify reniform nematode in a field since there are not any distinctive symptoms or signs of the organism. Although reniform nematode can occur with the Fusarium wilt fungus, the combination does not appear to be as serious as when southern root-knot nematodes are involved.

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