Nematode problems in tomato, okra, and other common vegetables, and their sustainable management

Desaeger, Johan; Khan, Mujeebur Rahman; Silva, Edgard Henrique Costa

doi:10.1016/b978-0-323-91226-6.00013-4

Cited by 2 publications

(2 citation statements)

References 74 publications

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“…infested soil. Desaeger et al (2023) highlighted that grafting adds costs to the seedling production process, as more seeds, time, and effort are required to obtain good-quality grafted seedlings, which should also be taken into account for a better use of this technique.…”

Section: Resultsmentioning

confidence: 99%

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Management of root-knot nematodes in okra through grafting onto kenaf and false roselle

Silva,

Ferreira,

Braz

2023

Pesq. agropec. bras.

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The objective of this work was to evaluate the performance of okra grafted onto Hibiscus spp. in the presence and absence of three root knot nematode species. The experimental design was completely randomized in a 4x4 factorial arrangement with ten replicates. The first factor consisted of the following four rootstocks: kenaf (Hibiscus cannabinus), false roselle (Hibiscus acetosella), self-grafted, and non-grafted. The second factor was the inoculation of 5,000 eggs and second-stage juveniles of Meloidogyne incognita, Meloidogyne javanica, and Meloidogyne enterolobii in okra plants, plus an uninoculated control. Vegetative development, agronomic performance, and nematode reproduction were evaluated. The grafting of okra onto Hibiscus spp. in the presence of root-knot nematodes provided a greater plant height, scion length, fresh shoot mass, number of fruits, and yield, when compared with self-grafted and non-grafted plants. The averages of the root-knot nematode reproduction factor were low in the plants grafted onto Hibiscus spp., indicating that grafting in the presence of root-knot nematodes is capable of maintaining okra vegetative development and yield.

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Section: Resultsmentioning

confidence: 99%

“…The control of these nematodes is a challenge, as they multiply quickly under favorable conditions and have a wide host range (Desaeger et al, 2023). Among the various control methods that have been studied, the use of resistant cultivars is indicated as the most efficient and sustainable (Hussain et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Management of root-knot nematodes in okra through grafting onto kenaf and false roselle

Silva,

Ferreira,

Braz

2023

Pesq. agropec. bras.

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Utilizing endophytic plant growth-promoting bacteria and the nematophagous fungus Purpureocillium lilacinum as biocontrol agents against the root-knot nematode (Meloidogyne incognita) on tomato plants

Ali,

Mahgoub,

Ahmed

et al. 2024

Eur J Plant Pathol

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The present investigation was designed to assess how administering biocontrol agents (BCAs) made from the nematophagous endophytic fungus MR20 (Purpureocillium lilacinum) or a mixture of endophytic plant growth-promoting bacteria MR12 (Pseudomonas fluorescens), and MR25 (Serratia marcescens), could enhance tomato growth and resistance to Meloidogyne incognita under in vivo conditions. The three strains’ cell-free culture filtrates showed a strong nematocidal impact (P < 0.05) on M. incognita infective second-stage juveniles (J2s). The highest mortality rates by the three BCAs were at concentrations of 80%, followed by 60%, 40%, and 20%. The in vitro hatching of free eggs was found to be considerably (P < 0.05) reduced as the concentrations of the endophytic bacteria MR12, and MR25 were increased in the order 1 × 105, 1 × 106, 1 × 107, 0.5 × 108, to 1 × 108 colony forming units (CFU)/mL, and the maximum nematicidal activity in killing M. incognita free eggs occurred at 1 × 108 CFU/mL. A statistically significant (P < 0.05) reduction in the percentage of M. incognita-free eggs retrieved was seen in vitro when various concentrations of the endophytic fungus MR20 were applied compared to the negative control (distilled water). The endophytic fungus MR20 had the highest nematicidal activity against M. incognita free eggs at a concentration of 3 × 106 CFU/mL. The application of P. lilacinum or a combination of P. fluorescens and S. marcescens to tomato plants in the presence of M. incognita under greenhouse conditions resulted in a significant increase (P < 0.05) in root and shoot fresh weight, number of leaves, weight of leaves, and stem diameter when compared to the positive control treatment that contained only M. incognita. Treatment with P. lilacinum was more effective (P < 0.05) than P. fluorescens and S. marcescens in reducing egg masses per root, J2s per 100 g of soil, egg masses per 100 g of soil, J2s + eggs of M. incognita per 100 g of soil, reproduction factor, and reduction percentage after 60 days under greenhouse conditions. Nevertheless, the reduction of M. incognita gall size categorization (> 4 mm, 2–4 mm, and < 2 mm) was more effectively achieved by treatment with P. fluorescens and S. marcescens than by treatment with P. lilacinum. Under in vivo conditions, the tested P. lilacinum or a mixture of P. fluorescens and S. marcescens effectively controlled nematode population densities below the economic threshold.

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Nematode problems in tomato, okra, and other common vegetables, and their sustainable management

Cited by 2 publications

References 74 publications

Management of root-knot nematodes in okra through grafting onto kenaf and false roselle

Management of root-knot nematodes in okra through grafting onto kenaf and false roselle

Utilizing endophytic plant growth-promoting bacteria and the nematophagous fungus Purpureocillium lilacinum as biocontrol agents against the root-knot nematode (Meloidogyne incognita) on tomato plants

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