Nematode Disease Complexes

Ravichandra, N. G.

doi:10.1007/978-81-322-1841-8_9

Cited by 4 publications

(1 citation statement)

References 53 publications

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“…Fusarium oxysporum) that caused root wilt, as the RNKs population here is far below the estimated threshold level of plant survival obtained from the nearby farming land. The RNKs-pathogen complex led to worse symptoms than those produced by RKNs or pathogen alone (Ravichandra, 2014). On the other hand, intercropping is indeed a labour-intensive practice for the management of the economic input per unit land.…”

Section: Discussionmentioning

confidence: 99%

Intercropping with Chinese leek decreasedMeloidogyne javanicapopulation and shifted microbial community structure in Sacha Inchi plantation

Nie,

Feng,

Cheng

et al. 2021

J. Agric. Sci.

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The root-knot nematode, Meloidogyne javanica, is a major problem for the production of Sacha Inchi plants. We examined the effects of strip intercropping of Sacha Inchi/Chinese leek of 3–4 years on the seasonal dynamics of plant and soil traits in tropical China. Results indicated that in the intercropping system, a partially temporal divergence of belowground resource acquisition via niche separation occurred throughout the growing seasons, besides a complete spatially-separated plant height between the two crops. Compared with Sacha Inchi monoculture, the increased seed yield per unit area in the intercropping system was mainly attributed to the higher plant survival rate, rather than the enhanced plant traits of healthy plants. Intercropping greatly suppressed M. javanica populations only in the wet season, compared with monoculture; which may be associated with the combined effects of the direct allelopathy and indigenous microbe induced-suppressiveness. Intercropping did not affect microbial richness and α-diversity in the rhizosphere, except for the decreased fungal richness. Both bacterial and fungal composition and structure were diverged between monoculture v. intercropping system. The relative abundances of the dominant bacterial genera (Bacillus, Gaiellales, Lactococcus, Massilia and Lysobacter, etc.) differed significantly between the two cropping systems. For fungi, intercropping decreased the relative abundances of Fusarium and Gibberella, but increased those of Nectriaceae_unclassified, Chaetomiaceae, Humicola and Mortierella. Overall, Sacha Inchi/Chinese leek intercropping suppressed M. javanica populations and shifted microbial compositions (especially decreased pathogen-containing Fusarium). The increased yield and economic returns in this intercropping system provide valid information for the effective agricultural management.

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Section: Discussionmentioning

confidence: 99%

Intercropping with Chinese leek decreasedMeloidogyne javanicapopulation and shifted microbial community structure in Sacha Inchi plantation

Nie,

Feng,

Cheng

et al. 2021

J. Agric. Sci.

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Interactions between plant parasitic nematodes and other harmful organisms

Benjamin,

Miriyagalla,

Adebanjo

et al. 2024

Indian Phytopathology

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Biocontrol potential of endophytic fungi against phytopathogenic nematodes on potato (Solanum tuberosum L.)

Ghareeb,

Jaremko,

Abdelsalam

et al. 2024

Sci Rep

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Root-knot nematodes (RKNs) are a vital pest that causes significant yield losses and economic damage to potato plants. The use of chemical pesticides to control these nematodes has led to environmental concerns and the development of resistance in the nematode populations. Endophytic fungi offer an eco-friendly alternative to control these pests and produce secondary metabolites that have nematicidal activity against RKNs. The objective of this study is to assess the efficacy of Aspergillus flavus (ON146363), an entophyte fungus isolated from Trigonella foenum-graecum seeds, against Meloidogyne incognita in filtered culture broth using GC–MS analysis. Among them, various nematicidal secondary metabolites were produced: Gadoleic acid, Oleic acid di-ethanolamide, Oleic acid, and Palmitic acid. In addition, biochemical compounds such as Gallic acid, Catechin, Protocatechuic acid, Esculatin, Vanillic acid, Pyrocatechol, Coumarine, Cinnamic acid, 4, 3-indol butyl acetic acid and Naphthyl acetic acid by HPLC. The fungus was identified through morphological and molecular analysis, including ITS 1–4 regions of ribosomal DNA. In vitro experiments showed that culture filtrate of A. flavus had a variable effect on reducing the number of egg hatchings and larval mortality, with higher concentrations showing greater efficacy than Abamectin. The fungus inhibited the development and multiplication of M. incognita in potato plants, reducing the number of galls and eggs by 90% and 89%, respectively. A. flavus increased the activity of defense-related enzymes Chitinas, Catalyse, and Peroxidase after 15, 45, and 60 days. Leaching of the concentrated culture significantly reduced the second juveniles’ stage to 97% /250 g soil and decreased the penetration of nematodes into the roots. A. flavus cultural filtrates via soil spraying improved seedling growth and reduced nematode propagation, resulting in systemic resistance to nematode infection. Therefore, A. flavus can be an effective biological control agent for root-knot nematodes in potato plants. This approach provides a sustainable solution for farmers and minimizes the environmental impact.

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Nematode Disease Complexes

Cited by 4 publications

References 53 publications

Intercropping with Chinese leek decreasedMeloidogyne javanicapopulation and shifted microbial community structure in Sacha Inchi plantation

Intercropping with Chinese leek decreasedMeloidogyne javanicapopulation and shifted microbial community structure in Sacha Inchi plantation

Interactions between plant parasitic nematodes and other harmful organisms

Biocontrol potential of endophytic fungi against phytopathogenic nematodes on potato (Solanum tuberosum L.)

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