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Assessment of Yam Varieties Reaction to Plant Parasitic Nematodes Infestation in -Two Agro-Ecologies of FCT, Nigeria

Received: 11 August 2025     Accepted: 20 August 2025     Published: 11 September 2025
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Abstract

Yams (Dioscorea spp.) are monocotyledonous plant that belongs to the family Dioscoreaceae, originated from Southeast Asia. In this study, five popular Yam varieties namely Kwasi, Yangbede, Shakata, Army and Pamio were evaluated for their reactions to Plant Parasitic Nematodes (PPNs) infestation in two locations Kwali and Kuje of FCT, Nigeria where yam is cultivated. Percentage frequency of PPNs, Mean population densities of PPNs and Occurrence of yam varieties were analyzed using Analysis of Variance where means were separated using Duncan Multiple Range Test at 5% level of probability. The percentage frequency Pratylenchus spp of Kwasi yam variety at Kwali was 51.3% higher than at Kuje 47.5%. Three nematodes; Pratylenchus spp, Meloidogyne spp, and Scutellonema spp were isolated from rhizosphere soils across the locations. Pratylenchus spp mean population was 121.08% and 97.24% higher than Meloidogyne spp was 113.01% and 91.23% and Scutellonema spp was 82.21% & 36.13% at Kwali respectively. However, the mean population at Kuje shows that Pratylenchus spp has 77.08% which is higher than, Scutellonema spp and Meloidogyne spp (28.23% and 23.37%) Similarly, 77.08% and 55.11% of Pamio yam variety were found more than Army at Kwali and Kuje respectively. This research has highlighted the presence of Shakata, Yangbede, Kwasi, Army and Pamio and yangbede yam varieties infestation of PPNs in all locations. Thus, there is a need to factor in nematode suppressive strategies into the cultural practices utilized in the entire yam producing endemic area if optimum yield is to be realized.

Published in Agriculture, Forestry and Fisheries (Volume 14, Issue 5)
DOI 10.11648/j.aff.20251405.12
Page(s) 186-190
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2025. Published by Science Publishing Group

Keywords

Varieties, PPNs, Meloidogyne Spp, Pratylenchus Spp, Scutellonema Spp, Rhizosphere

1. Introduction
Yam is the second most important root and tuber crop in the World after Cassava in terms of production and contributes more than 200 dietary calories per day for 60 million people in the yam zone . It has been a prominent food and cash crop for most farmers in the yam production areas of Nigeria, with the sales of yam in both domestic and international markets contributing significantly to the economy of the country . Yams (Dioscorea spp.) are monocotyledonous plant which belongs to the family from Southeast Asia, South America, and West Africa. It is an important economic crop comprising more than 900 species which are particularly grown in tropical countries of West Africa countries. The highest producer of Yam production is concentrated in West Africa, with Nigeria producing the largest proportion followed by Ghana and Cote d’lvoire Yams is an important subsistence food crop which is useful in the same manner as potatoes in the western world. These tubers provide a substantial intake of vitamins (thiamine and vitamin C), iron and potassium . It is commonly used as a boiled, baked, fried, roasted or mashed to suit regional tastes and customs . The Peels and matured yam tubers are used as feed to domestic animals such as pigs, goats, and chickens. More importantly, many of the Dioscorea spp. have high content of steroidal saponins which make them suitable for industrial applications as corticosteroids precursors and anti-cancer bioactive compounds . The productivity and profitability of yam cultivation are increasingly compromised by various biotic stresses, among which the parasitic nematodes pose one of the most formidable challenges . Yam is gradually being realized as an important non-traditional crop for export in Ghana . Despite numerous the importance, yam production still falls behind other tuber and cereal crops . Yam ranks second in tubers in terms of volume and value of non-traditional export crops in Ghana and the second highest producer in the world after Nigeria .
Plant parasitic nematodes (PPNs) are essential biotic stress factor in crop production. PPNs infection undermines resistance to other pests and diseases while predisposes plants to other pathogens that, in turn, magnify losses but also mask the nematode damage. Crop yield losses due to nematodes are difficult to calculate accurately, with global estimates varying considerably from $US 80 billion to $US 157 billion per year . Nematode infection contributes to long term storage losses estimated as 50%, and in some instances, loss could be total . Pratylenchus spp, Meloidogyne spp and Scutellonema spp (yam nematode) are the primary major lesion nematode and they cause dry rot disease of tubers. These PPNs causes dry rot symptoms to yam in West and East Africa. Scutellonema spp is considered the most important species of all species which constitute Low levels of infection on seed tubers, which may go undetected, provide inoculum to the next crop, and lead to heavy losses of infected tubers during storage. PPNs have traditionally been the species associated with yield loss in yam . The intensive cultivation of yam (and other crops) on the same land leads to the buildup of Plant Parasitic Nematodes (PPNs) which can be responsible for heavy losses through reduced quality of tubers. The yield losses encountered due to the PPNs, pose severe threats to global agricultural crops, and yields of yam .
In the present study, five yam varieties in FCT, Nigeria were evaluated for their reaction to plant parasitic nematodes infection under stable field conditions at kwali and Kuje Area Council of Nigeria.
2. Materials and Methods
2.1. Study Sites
The trials were conducted during 2024 planting season in two Area Councils (ACs) locations in FCT of Nigeria. The sites were Yangoji, Wako, Kundu, Dafa, and Ashara (Kwali Location), Kuchiyako, Damwa, Aduga, Bamishi, and Kuje Urban (Kuje Location). Yam is extensively cultivated in these areas and initial parasitic nematode population densities were perceived to be very high. All the sites experience uniform rainfall pattern. The geo-ecological, climatic, and edaphic factors were determined.
2.2. Experimental Design
Land preparation was done manually by clearing weeds with a cutlass and debris was removed. Stumps were removed with a pickaxe before heaps were raised at a planting distance of 1 m x 1 m. There were 20 heaps of four rows on a 3 m x 4 m plot size. Trials were mounted on Randomized Complete Block Design (RCBD) with five replications on a total land area of 450 m2 at each site.
2.3. Plant Material
Five popular yam varieties were used, Shakata, Yangbede, Kwasi, Army and Pamio commonly cultivated by farmers and highly patronized by buyers were selected for the trials. The varieties were sourced from Research institute. Yam seeds averaging 450 g were used for planting. Seeds were tested for presence of plant parasitic nematodes (PPNs) prior to planting. Seeds were placed in the hole made with a hoe in the heaps and properly covered with soil. Dry straw was placed on top of the heaps for moisture preservation after planting. After sprouting, yam vines were supported with stakes and the experimental trials were weeded five times before harvest. The trials had five replications at each location.
2.4. Soil Sampling for Nematodes
Initial soil sampling was collected prior to planting to determine plant parasitic nematodes population densities at the various sites. Stand establishment was taken 3 months after planting. At harvest, soil samples (200 cm3 / mound) were randomly collected with a 2.5 cm diameter soil probe to a depth of 20 cm from the mounds. Three soil cores were collected from each mound. Five-gram tuber peel samples were processed for nematodes from the tubers at harvest. Three tubers per plot were peeled for extraction. Nematodes were extracted from soil and peel samples using the modified Baermann funnel method. After 24 hours of extraction, samples were fixed with Formalin - 49% and distilled water 110.4 ml and second, third and fourth stage nematodes were mounted on aluminium double cover glass slides and specimens were identified (CIH, 1978) by morphology. Plant parasitic nematode population data are expressed as number of nematodes/200 cm3 soil.
2.5. Data Analysis
Data was analyzed using Statistical Analysis System (SAS) and the means separated using Duncan Multiple Range Test at 5% level of probability.
3. Result and Discusions
The Percentage Frequency of Plant Parasitic Nematodes in Kwali Area Council of FCT in Figure 1 shows the percentage of plant parasitic nematodes at Kwali ACs of FCT. The percentage of Pratylenchus spp (51.3%) differ significantly from Trichodorous spp (0.5%). But there was no significant difference in the percentage of Xiphinema spp (2.1%) and Helicotylenchus spp (2.1%). However, Heterodera spp (1.1%) differs significantly from Scutellonema spp (10.1%). The least percentage was observed in Longidorous spp (0.9%). Meloidogyne spp (22.4%) and Criconemoides spp (1.0%) differ significantly from each other.
Figure 1. The Percentage Frequency Presentation of Plant Parasitic Nematodes in Kwali ACs of FCT.
In table 1, The mean population densities of plant parasitic nematodes associated with yam plants in the five selected villages of Kwali AC of FCT, the mean population density in Table 1 shows that there was no significant difference in Yangoji yam farms for Pratylenchus spp (121.08) and Meloidogyne spp (113.01). Also, no significant difference was observed for Pratylenchus spp, Scutellonema spp, Meloidogyne spp (97.24, 83.21, and 91.23) at Wako yam farm. However, at Dafa yam farm, there was significant difference in Pratylenchus spp (83.10), Scutellonema spp (36.13), and Tylenchus spp (25.55). Aphelenchus spp, Longidorous spp, Heterodera spp and Criconemoides spp show no significant difference in all the yam farms. Also, there was no significant difference in Meloidogyne spp at Kundu, Dafa, and Ashara yam farms (67.24, 77.13, and 62.62).
Table 1. Mean Population Densities of Plant Parasitic Nematodes Associated with Yam Plants in Five Selected Villages of Kwali ACs of FCT.

Villages

SP 1

SP 2

SP 3

SP 4

SP 5

SP 6

SP 7

SP 8

SP 9

SP 10

SP 11

Yangoji

121.08±4.12a

76.14±3.71ab

113.01±4.01a

56.31±3.75b

36.77±1.87bc

7.05±0.08cd

23.22±1.87c

1.65±0.01d

0.00±0.00d

0.00±0.00d

0.10±0.20d

Wako

97.24±3.98a

83.21±3.31ab

91.23±3.91a

45.32±2.99b

15.16±1.12cd

6.35±0.05cd

0.00±0.11d

1.22±0.00d

0.00±0.00d

0.00±0.00d

0.00±0.31d

Kundu

93.97±4.72a

78.24±2.11ab

67.24±3.56ab

33.53±2.24bc

11.70±2.28cd

7.15±0.01cd

34.12±2.13bc

1.20±0.00d

0.01±0.00d

0.00±0.00d

0.30±0.00d

Dafa

83.10±4.11ab

36.13±3.00bc

77.13±3.48ab

25.55±2.89c

17.26±1.04cd

6.12±1.08cd

1.45±0.35d

1.83±1.64d

0.03±0.00d

0.00±0.00d

0.00±0.00d

Ashara

71.12±3.01ab

43.11±2.94b

62.62±3.10ab

21.34±1.25c

13.11±1.61cd

10.11±1.01cd

0.12±0.00d

2.01±1.11d

0.00±0.00d

0.00±0.00d

0.00±0.00d

Means in a column of any set of treatments followed by different letters are significantly different at 0.05%
KEYS: SP 1 - Pratylenchus, SP 2 - Scutellonema, SP 3 - Meloidogyne, SP 4 - Tylenchus, SP 5 - Xiphinema, SP 6 - Helicotylenchus, SP 7 - Trichodorus, SP 8 - Aphelenchus, SP 9 - Longidorous, SP 10 - Heterodera, SP 11 - Criconemoides
Figure 2. The Percentage Frequency Presentation of Plant Parasitic Nematodes in Kuje AC of FCT.
The percentage of plant parasitic nematodes (PPNs) at Kuje ACs is presented in Figure 2. The percentage of plant parasitic nematodes revealed that Pratylenchus spp (47.5%) was significantly differennt from Heterodera spp (4.1%). However, there was no significant difference in Xiphinema spp (3.7%), Helicotylenchus spp (3.2%) and Trichodorous spp (3.7%). Moreso, Meloidogyne spp (13.7%) differs significantly from Scutellonema spp (8.2%) in Kuje Acs. There was no significant difference in Tylenchus spp (7.3%) and Rotylenchus spp (7.0%) respectively.
The mean population densities of plant parasitic nematodes associated with yam plants in the five selected villages of Kuje AC of FCT in Table 2 shows that mean population densities in Pratylenchus spp (77.08) at Kuchiyako yam farm differs significantly from Damwa (54.11), Aduga (34.21), Bamishi (33.37), and Kuje Urban (12.12). however, there was no insignificant difference in Scutellonema spp in Aduga and Bamishi (28.23 and 26.13). There was no significant difference in Helicotylenchus spp in all yam farms at Kuje ACs (6.05, 4.11, 7.18, 5.34, and 8.11) but significant difference was observed in Tylenchus spp at Kuchiyako (36.92) Kuje Urban (15.14). Also, no significant difference was observed in Rotylenchus spp (11.65) at Bamishi and Kuje Urban. More so, there was no significant difference in Scutellonema spp, Meloidogyne spp, Tylenchus spp, and Rotylenchus spp at Aduga yam farm (28.23, 23.37, 23.92, 20.34). significant difference was observed in Meloidogyne spp (58.76) and Rotylenchus spp (23.35) at Kuchiyako yam farm.
Table 2. Mean Population Densities of Plant Parasitic Nematodes Associated with Yam Plants in Five Selected Villages of Kuje ACs of FCT.

Villages

SP 1

SP 2

SP 3

SP 4

SP 5

SP 6

SP 7

SP 8

SP 9

SP 10

SP 11

Kuchiyako

77.08±5.10a

45.44±3.26ab

58.76±4.21b

36.92±2.56ab

23.35±2.48c

10.26±1.14cd

6.05±1.08d

3.82±0.30d

1.00±0.00d

0.11±0.00d

0.00±0.11d

Damwa

54.11±4.84b

37.45±3.01ab

43.11±3.96ab

31.52±1.21ab

19.52±1.73cd

25.16±3.12c

4.11±0.05d

0.31±0.61d

1.42±0.00d

0.00±0.00d

0.00±0.00d

Aduga

34.21±3.45ab

28.23±2.73c

23.37±4.56c

23.92±1.24c

20.34±1.56cd

32.16±2.28ab

7.18±1.01d

0.12±0.00d

1.10±0.00d

0.01±0.00d

0.00±0.00d

Bamishi

33.37±2.22ab

26.13±2.02c

36.11±2.66ab

19.45±3.89cd

11.65±3.49cd

17.16±1.14cd

5.34±1.08d

0.46±0.31d

1.00±1.60d

0.03±0.00d

1.06±0.00d

Kuje Urban

21.12±1.78c

13.11±2.19cd

41.31±1.94ab

15.14±1.48ab

11.34±1.15cd

13.41±1.41cd

8.11±1.01d

3.12±1.01d

2.01±0.11d

0.00±0.00d

1.00±0.00d

Means in a column of any set of treatments followed by different letters are significantly different at 0.05%
KEYS: SP 1 - Pratylenchus, SP 2 - Scutellonema, SP 3 - Meloidogyne, SP 4 - Tylenchus, SP 5 - Rotylenchus, SP 6 - Xiphinema, SP 7 - Helicotylenchus, SP 8 - Trichodorus, SP 9 - Aphelenchus, SP 10 - Longidorous, SP 11 - Heterodera
4. Conclusion and Recommendation
This research has demonstrated that pathological reaction of the PPNs of the five yam varieties. The histopathology study also revealed that yam exhibited a typical Pratylenchus spp susceptible reaction. Plant parasitic nematodes have been reported to cause yield losses in yam production and which later caused cell disruption and disorganization in the cortex endodermis and vascular cells and formation of giant cells which is essential for a successful host/nematode relationship. However, adoption of early planting and rouging of infected yam fields will also serve as other management technique . All the identified plant parasitic nematodes could be utilized for breeding resistant yam varieties. However, nematode association with yam brought about yield and quality reduction. A lot of research reporting nematode damage to crops has supported this claim . These plant parasitic nematodes do not attack plant alone but generally constitute multi pathogenic population in which this component species interact continuously under field condition . There is a need to factor in nematode suppressive strategies into the cultural practices utilized in the entire yam producing nematode endemic area if optimum yield is to be realized.
Abbreviations

Acs

Area Councils

PPNs

Plant Parasitic Nematodes

Conflicts of Interest
The authors declare no conflicts of interest.
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    Olaniyi, R. M., Bello, L. Y., Salaudeen, M. T., Paiko, A. S., Falaye, M. H. (2025). Assessment of Yam Varieties Reaction to Plant Parasitic Nematodes Infestation in -Two Agro-Ecologies of FCT, Nigeria. Agriculture, Forestry and Fisheries, 14(5), 186-190. https://doi.org/10.11648/j.aff.20251405.12

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    Olaniyi, R. M.; Bello, L. Y.; Salaudeen, M. T.; Paiko, A. S.; Falaye, M. H. Assessment of Yam Varieties Reaction to Plant Parasitic Nematodes Infestation in -Two Agro-Ecologies of FCT, Nigeria. Agric. For. Fish. 2025, 14(5), 186-190. doi: 10.11648/j.aff.20251405.12

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    Olaniyi RM, Bello LY, Salaudeen MT, Paiko AS, Falaye MH. Assessment of Yam Varieties Reaction to Plant Parasitic Nematodes Infestation in -Two Agro-Ecologies of FCT, Nigeria. Agric For Fish. 2025;14(5):186-190. doi: 10.11648/j.aff.20251405.12

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  • @article{10.11648/j.aff.20251405.12,
      author = {Rukayat Mojisola Olaniyi and Ladi Yunus Bello and Muhammadu Tajudeen Salaudeen and Adamu Saidu Paiko and Motunrayo Helen Falaye},
      title = {Assessment of Yam Varieties Reaction to Plant Parasitic Nematodes Infestation in -Two Agro-Ecologies of FCT, Nigeria
    },
      journal = {Agriculture, Forestry and Fisheries},
      volume = {14},
      number = {5},
      pages = {186-190},
      doi = {10.11648/j.aff.20251405.12},
      url = {https://doi.org/10.11648/j.aff.20251405.12},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.aff.20251405.12},
      abstract = {Yams (Dioscorea spp.) are monocotyledonous plant that belongs to the family Dioscoreaceae, originated from Southeast Asia. In this study, five popular Yam varieties namely Kwasi, Yangbede, Shakata, Army and Pamio were evaluated for their reactions to Plant Parasitic Nematodes (PPNs) infestation in two locations Kwali and Kuje of FCT, Nigeria where yam is cultivated. Percentage frequency of PPNs, Mean population densities of PPNs and Occurrence of yam varieties were analyzed using Analysis of Variance where means were separated using Duncan Multiple Range Test at 5% level of probability. The percentage frequency Pratylenchus spp of Kwasi yam variety at Kwali was 51.3% higher than at Kuje 47.5%. Three nematodes; Pratylenchus spp, Meloidogyne spp, and Scutellonema spp were isolated from rhizosphere soils across the locations. Pratylenchus spp mean population was 121.08% and 97.24% higher than Meloidogyne spp was 113.01% and 91.23% and Scutellonema spp was 82.21% & 36.13% at Kwali respectively. However, the mean population at Kuje shows that Pratylenchus spp has 77.08% which is higher than, Scutellonema spp and Meloidogyne spp (28.23% and 23.37%) Similarly, 77.08% and 55.11% of Pamio yam variety were found more than Army at Kwali and Kuje respectively. This research has highlighted the presence of Shakata, Yangbede, Kwasi, Army and Pamio and yangbede yam varieties infestation of PPNs in all locations. Thus, there is a need to factor in nematode suppressive strategies into the cultural practices utilized in the entire yam producing endemic area if optimum yield is to be realized.
    
    },
     year = {2025}
    }
    

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  • TY  - JOUR
    T1  - Assessment of Yam Varieties Reaction to Plant Parasitic Nematodes Infestation in -Two Agro-Ecologies of FCT, Nigeria
    
    AU  - Rukayat Mojisola Olaniyi
    AU  - Ladi Yunus Bello
    AU  - Muhammadu Tajudeen Salaudeen
    AU  - Adamu Saidu Paiko
    AU  - Motunrayo Helen Falaye
    Y1  - 2025/09/11
    PY  - 2025
    N1  - https://doi.org/10.11648/j.aff.20251405.12
    DO  - 10.11648/j.aff.20251405.12
    T2  - Agriculture, Forestry and Fisheries
    JF  - Agriculture, Forestry and Fisheries
    JO  - Agriculture, Forestry and Fisheries
    SP  - 186
    EP  - 190
    PB  - Science Publishing Group
    SN  - 2328-5648
    UR  - https://doi.org/10.11648/j.aff.20251405.12
    AB  - Yams (Dioscorea spp.) are monocotyledonous plant that belongs to the family Dioscoreaceae, originated from Southeast Asia. In this study, five popular Yam varieties namely Kwasi, Yangbede, Shakata, Army and Pamio were evaluated for their reactions to Plant Parasitic Nematodes (PPNs) infestation in two locations Kwali and Kuje of FCT, Nigeria where yam is cultivated. Percentage frequency of PPNs, Mean population densities of PPNs and Occurrence of yam varieties were analyzed using Analysis of Variance where means were separated using Duncan Multiple Range Test at 5% level of probability. The percentage frequency Pratylenchus spp of Kwasi yam variety at Kwali was 51.3% higher than at Kuje 47.5%. Three nematodes; Pratylenchus spp, Meloidogyne spp, and Scutellonema spp were isolated from rhizosphere soils across the locations. Pratylenchus spp mean population was 121.08% and 97.24% higher than Meloidogyne spp was 113.01% and 91.23% and Scutellonema spp was 82.21% & 36.13% at Kwali respectively. However, the mean population at Kuje shows that Pratylenchus spp has 77.08% which is higher than, Scutellonema spp and Meloidogyne spp (28.23% and 23.37%) Similarly, 77.08% and 55.11% of Pamio yam variety were found more than Army at Kwali and Kuje respectively. This research has highlighted the presence of Shakata, Yangbede, Kwasi, Army and Pamio and yangbede yam varieties infestation of PPNs in all locations. Thus, there is a need to factor in nematode suppressive strategies into the cultural practices utilized in the entire yam producing endemic area if optimum yield is to be realized.
    
    
    VL  - 14
    IS  - 5
    ER  - 

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