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Evaluation of Weed Species for Host Status to the Root-Knot Nematodes Meloidogyne enterolobii and M. incognita Race 4

Tanner Schwarz

Tanner Schwarz

Department of Entomology and Plant Pathology, North Carolina State UniversityRaleigh,
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Schwarz, Tanner
, 
Chitra,

Chitra,

Department of Horticultural Science, North Carolina State UniversityRaleigh,
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Chitra,
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Katherine Jennings

Katherine Jennings

Department of Horticultural Science, North Carolina State UniversityRaleigh,
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Jennings, Katherine
 e 
Adrienne Gorny

Adrienne Gorny

Department of Entomology and Plant Pathology, North Carolina State UniversityRaleigh,
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Gorny, Adrienne
  
22 apr 2024
Evaluation of Weed Species for Host Status to the Root-Knot Nematodes Meloidogyne enterolobii and M. incognita Race 4's Cover Image
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Categoria dell'articolo: Research Paper
Pubblicato online: 22 apr 2024
Ricevuto: 04 mag 2023
DOI: https://doi.org/10.2478/jofnem-2024-0017
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© 2024 Tanner Schwarz et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1:

(A) Sicklepod (Senna obtusifolia) resistant to Meloidogyne incognita race 4. (B) Resistant large crabgrass (Digitaria sanguinalis) inoculated with M. enterolobii showing no nematode gall formation. (C) Pink purslane (Portulaca pilosa) infected with M. incognita race 4; susceptible host displaying galling damage. (D) Entireleaf morningglory (Ipomoea hederacea) susceptible to M. enterolobii with galling symptoms.
(A) Sicklepod (Senna obtusifolia) resistant to Meloidogyne incognita race 4. (B) Resistant large crabgrass (Digitaria sanguinalis) inoculated with M. enterolobii showing no nematode gall formation. (C) Pink purslane (Portulaca pilosa) infected with M. incognita race 4; susceptible host displaying galling damage. (D) Entireleaf morningglory (Ipomoea hederacea) susceptible to M. enterolobii with galling symptoms.

Host status of 10 weed species common in North Carolina, USA to the RKN Meloidogyne incognita race 4 in two separate greenhouse trials_ Weed plants were inoculated with 5,000 eggs of M_ incognita and evaluated for egg production and root galling 60 days post inoculation_ Values are the mean of five replicate plants per trial_ Values followed by the same letter within the column are not significantly different at the α = 0_05 level_

Weed Species Rfa Gall Ratingb R/S
Trial 1 Trial 2 Trial 1 Trial 2
Palmer amaranth (Amaranthus palmeri) 2.84c 3.48c 9b 5b S
Yellow nutsedge (Cyperus esculentus) 0.24a 0.24a 0a 0a R
Purple nutsedge (Cyperus rotundus) 12.87c 4.36c 5a 5b S
Jimsonweed (Datura stramonium) 0.06a 0.04a 0a 0a R
Large crabgrass (Digitaria sanguinalis) 0.08a 0.05a 0a 0a R
Entireleaf morningglory (Ipomoea hederacea) 4.14c 4.40c 5a 10b S
Pitted morningglory (Ipomoea lacunosa) 14.23c 9.84c 10b 10b S
Pink purslane (Portulaca pilosa) 8.79c 11.31c 60b 35c S
Sicklepod (Senna obtusifolia) 0.08a 0.07a 0a 0a R
Prickly sida (Sida rhombifolia) 1.80b 2.04b 5a 5b S

Host status of 10 weed species common in North Carolina, USA to the RKN Meloidogyne enterolobii in two separate greenhouse trials_ Weed plants were inoculated with 5,000 eggs of M_ enterolobii and evaluated for egg production and root galling 60 days post inoculation_ Values are the mean of five replicate plants per trial_ Values followed by the same letter within the column are not significantly different at the α = 0_05 level_

Weed Species Rfa Gall Ratingb R/S
Trial 1 Trial 2 Trial 1 Trial 2
Palmer amaranth (Amaranthus palmeri) 2.69b 3.35b 5b 5b S
Yellow nutsedge (Cyperus esculentus) 0.13a 0.09a 0a 0a R
Purple nutsedge (Cyperus rotundus) 0.53a 0.44a 0a 0a R
Jimsonweed (Datura stramonium) 0.08a 0.06a 0a 0a R
Large crabgrass (Digitaria sanguinalis) 0.06a 0.07a 0a 0a R
Entireleaf morningglory (Ipomoea hederacea) 5.36b 5.14b 14b 20b S
Pitted morningglory (Ipomoea lacunosa) 8.26b 8.03b 19b 10b S
Pink purslane (Portulaca pilosa) 9.64b 7.18b 50b 25b S
Sicklepod (Senna obtusifolia) 0.15a 0.10a 0a 0a R
Prickly sida (Sida rhombifolia) 0.07a 0.05a 0a 0a R
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