<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The interaction between <italic>Fusarium oxysporum</italic> f. sp. <italic>vasinfectum</italic> (Fov) and <italic>Meloidogyne incognita</italic> (root-knot nematode) resulting in Fusarium wilt (FW) of cotton is well-known. Although <italic>Belonolaimus longicaudatus</italic> (sting nematode) can also interact with Fov and cause FW, it has long been believed that virtually all of the FW in Georgia is caused by the interaction of Fov with <italic>M. incognita</italic>. In recent years, FW has been reported more frequently in Georgia, which suggests that something affecting the disease complex may have changed. In 2015 and 2016, a survey of 27 Georgia cotton fields in 10 counties was conducted. At least 10 soil and stem samples per field were collected from individual plants showing symptoms of FW to quantify plant-parasitic nematode levels and identify Fov races. Fov race 1 was identified in all samples in 2015, but one sample also had the LA110 genotype and another sample also had the LA108 genotype. In 2016, all Fov races and genotypes found in 2015 were present, however, MDS–12 and LA127/140 also were found. <italic>Meloidogyne incognita</italic> was present in 18% of fields in 2015 and 40% in 2016, whereas <italic>B. longicaudatus</italic> was present in all fields in 2015 and 75% of fields in 2016. Regardless of whether they occurred separately or together, <italic>M. incognita</italic> and <italic>B. longicaudatus</italic> were present, respectively, in 18% and 55% of individual samples in 2015 and 40% and 51% in 2016. However, <italic>M. incognita</italic> without <italic>B. longicaudatus</italic> was found in 7% of samples in 2015 and 34% in 2016, whereas <italic>B. longicaudatus</italic> without <italic>M. incognita</italic> was found in 45% of samples in 2015 and 44% in 2016. We conclude that Fov race 1 continues to be the dominant race in Georgia and many instances of FW in Georgia may be due to Fov interacting with <italic>B. longicaudatus</italic> and not <italic>M. incognita</italic> as previously believed.</p>
</abstract>

The interaction between Fusarium oxysporum f. sp. vasinfectum (Fov) and Meloidogyne incognita (root-knot nematode) resulting in Fusarium wilt (FW) of cotton is well-known. Although Belonolaimus longicaudatus (sting nematode) can also interact with Fov and cause FW, it has long been believed that virtually all of the FW in Georgia is caused by the interaction of Fov with M. incognita. In recent years, FW has been reported more frequently in Georgia, which suggests that something affecting the disease complex may have changed. In 2015 and 2016, a survey of 27 Georgia cotton fields in 10 counties was conducted. At least 10 soil and stem samples per field were collected from individual plants showing symptoms of FW to quantify plant-parasitic nematode levels and identify Fov races. Fov race 1 was identified in all samples in 2015, but one sample also had the LA110 genotype and another sample also had the LA108 genotype. In 2016, all Fov races and genotypes found in 2015 were present, however, MDS–12 and LA127/140 also were found. Meloidogyne incognita was present in 18% of fields in 2015 and 40% in 2016, whereas B. longicaudatus was present in all fields in 2015 and 75% of fields in 2016. Regardless of whether they occurred separately or together, M. incognita and B. longicaudatus were present, respectively, in 18% and 55% of individual samples in 2015 and 40% and 51% in 2016. However, M. incognita without B. longicaudatus was found in 7% of samples in 2015 and 34% in 2016, whereas B. longicaudatus without M. incognita was found in 45% of samples in 2015 and 44% in 2016. We conclude that Fov race 1 continues to be the dominant race in Georgia and many instances of FW in Georgia may be due to Fov interacting with B. longicaudatus and not M. incognita as previously believed.

<article-title xml:lang="en">Fusarium wilt of cotton may commonly result from the interaction of <italic>Fusarium oxysporum</italic> f. sp. <italic>vasinfectum</italic> with <italic>Belonolaimus longicaudatus</italic>


Journal of Nematology

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Fusarium wilt of cotton may commonly result from the interaction of  f. sp.  with 


running-head

The interaction between Fusarium oxysporum f. sp. vasinfectum (Fov) and Meloidogyne incognita (root-knot nematode) resulting in Fusarium wilt (FW) of cotton is...

Fusarium wilt of cotton may commonly result from the interaction of Fusarium oxysporum f. sp. vasinfectum with Belonolaimus longicaudatus

Article Category: Arts & Humanities

Published Online: Apr 23, 2019

Page range: 1 - 10

Received: Aug 29, 2018

DOI: https://doi.org/10.21307/jofnem-2019-015

© 2019 Mychele B. da Silva et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.