Impact of low-cost management techniques on population dynamics of plant-parasitic nematodes in sweet potato

2020 ◽  
Vol 137 ◽  
pp. 105311
Author(s):  
Hellen Maina ◽  
Hannah Karuri ◽  
Felix Rotich ◽  
Franklin Nyabuga
Keyword(s):  
Population Dynamics ◽  
Sweet Potato ◽  
Cost Management ◽  
Low Cost ◽  
Parasitic Nematodes ◽  
Plant Parasitic Nematodes ◽  
Management Techniques ◽  
Plant Parasitic

Population dynamics of plant parasitic nematodes in Queensland pineapple fields and the effects of these nematodes on pineapple production

1993 ◽  
Vol 33 (2) ◽  
pp. 197 ◽  
Author(s):  
GR Stirling ◽  
A Nikulin
Keyword(s):  
Population Dynamics ◽  
Population Density ◽  
Parasitic Nematodes ◽  
Plant Parasitic Nematodes ◽  
Root Knot Nematode ◽  
Ratoon Crop ◽  
Original Population ◽  
Ethylene Dibromide ◽  
Nematode Population Density ◽  
Plant Parasitic

Twelve pineapple fields with various densities of root-knot nematode were selected during a ratoon crop. Nematode populations were monitored regularly after the crop was ploughed out. Regardless of the original population density, rootknot nematodes were almost nondetectable at the end of the subsequent 3-6-month fallow intercycle period. In the absence of nematicide treatment there were marked differences between sites in the manner in which rootknot nematodes increased in the newly planted crop. At some sites, they were detectable 9-15 months after planting, whereas at other sites, nematodes were not observed at 15 months. Increases in ratoon crop yield following application of ethylene dibromide or fenamiphos were related to root-knot nematode population density. Significant increases in yield were not obtained at sites where the nematode was not detectable at 15 months. The results suggest that some pineapple growers are needlessly applying nematicides and that nematode diagnostic services should be developed to provide growers with advice on their nematode management programs.

scholarly journals Studies on plant-parasitic nematodes associated with sweet potato (Ipomoea batatas L., Lam.) in Gombe State, Nigeria

2021 ◽  
Vol 6 (4) ◽  
pp. 477-482
Author(s):  
Jidere Caleb Iliya ◽  
Simon Lilian Dada ◽  
Sulaiman Ibrahim ◽  
Abraham Peter
Keyword(s):  
Sweet Potato ◽  
Ipomoea Batatas ◽  
Parasitic Nematodes ◽  
Soil Core ◽  
Biotic Factors ◽  
Plant Parasitic Nematodes ◽  
High Similarity ◽  
Soil Extraction ◽  
Meloidogyne Spp ◽  
Plant Parasitic

Sweet potato (Ipomoea batatas L., Lam.) is one of the most frequently eaten food crops. Its production is affected by plant-parasitic nematodes as well as biotic factors. This study was conducted to document the different plant-parasitic nematodes (PPN) that limit the gainful production of sweet potato in Gombe State. Thirty soil core samples per hectare were collected at random from sweet potato farms in the three local government areas (Nafada, Kaltungo, and Yamaltu Deba) of Gombe state. The Whitehead and Hemming method and identification keys were used for the soil extraction and genera identification of the plant-parasitic nematodes respectively. A total of 15 plant-parasitic nematodes were recovered throughout the surveyed areas among which 7 are considered major nematode pests of global importance. Irrespective of the surveyed locations, Meloidogyne spp., was found to record the highest population density and prevalence value. The frequency of occurrence in Y/Deba and Nafada LGAs shows that Meloidogyne spp., wasthe most occurring (32 %) genera. In Kaltungo LGA however, Scutellonema spp., and Rotylenchusspp., were the most occurring (17 %) genera. There was a high similarity percentage (≥ 68 %) of PPN genera where 8 genera (Scutellonema spp., Nacobbus spp., Pratylenchus spp., Meloidogyne spp., Heterodera spp., Xiphinema spp., Trichodorus spp., and Rotylenchus spp.) were found to be common amongst the surveyed locations. This is the first report of plant-parasitic nematodes associated with sweet potato in Gombe state, Nigeria. Hence, it is critical to educate farmers in the regions about their effects on the crop and how to successfully manage them.

scholarly journals Studies on Population Dynamics of Pratylenchus sp. (Filipjev, 1936) about Soil Abiotic Factor in the Mulberry Field at Aurangabad, Maharashtra, India

2021 ◽  
Vol 8 (S1-Feb) ◽  
pp. 67-72
Author(s):  
Avhad Sunil B ◽  
Hiware Chandrashekhar J
Keyword(s):  
Population Dynamics ◽  
Soil Temperature ◽  
Abiotic Factors ◽  
Correlation Coefficients ◽  
Economic Importance ◽  
Morus Alba ◽  
Parasitic Nematodes ◽  
Abiotic Factor ◽  
Plant Parasitic Nematodes ◽  
Plant Parasitic

In the present study, the monthly population fluctuation of Pratylenchus sp. (Filipjev, 1936) is ascertain about soil temperature, moisture, pH in mulberry (Morus alba L.) field with economic importance within the sericulture. The studies target is to grasp the influence and impact of those soil abiotic factors on the population of those plant-parasitic nematodes and Correlation coefficients (r) between mean population Pratylenchus spand different soil abiotic factors in Aurangabad Mulberry garden.

Short-term nematode population dynamics as influenced by the quality of exogenous organic matter

Nematology ◽  
2009 ◽  
Vol 11 (1) ◽  
pp. 23-38 ◽  
Author(s):  
Ben Leroy ◽  
Dirk Reheul ◽  
Maurice Moens ◽  
Howard Ferris ◽  
Nancy De Sutter
Keyword(s):  
Population Dynamics ◽  
Organic Matter ◽  
Organic Amendments ◽  
Nematode Population ◽  
Parasitic Nematodes ◽  
Soil Conditions ◽  
Plant Parasitic Nematodes ◽  
Short Term ◽  
Nematode Assemblage ◽  
Plant Parasitic

AbstractThe food specificity of nematodes, their high number of species and high abundance in every habitat where decomposition takes place, indicate that the structure of the nematode assemblage has a high information content. Since nematodes respond quickly to changes in soil management and since the nematode fauna can be efficiently analysed, the structure of the nematode assemblage offers an interesting instrument to assess changes in soil conditions. We studied the effect of five organic amendments on the short-term nematode population dynamics and compared them to minerally fertilised and unfertilised plots. The experiment was started in 2005, and samples were taken in spring and autumn 2006 and spring 2007. In spring 2006, no clear differences among treatments in the diversity of free-living nematodes were observed, probably since the organic amendments were applied only twice, of which the last application was carried out 7 months before the sampling. At the second and third sampling, the enrichment index in the organically amended plots was higher than in the unamended plots, owing to the organic matter application. However, in plots amended with farmyard manure and cattle slurry the number of bacterivores increased significantly, while in the compost plots the fungivorous nematodes tended to be higher. This resulted in a low channel index for the manure and slurry plots, indicating a predominant bacterial decomposition pathway, and a higher channel index in the compost plots, suggesting a greater proportion of fungal decomposition. These assumptions on the decomposition of the applied organic matter were strongly supported by the composition of the soil microbial community, determined through PLFA analysis: in the compost plots the bacteria to fungi ratio was lower than in the manure and slurry plots. At all sampling occasions there was a remarkably lower abundance of plant-parasitic nematodes in plots amended with slurry and manure, indicating a negative impact of both amendments on plant-parasitic nematodes. We can conclude from this study that the fertiliser regimes affected the nematode assemblage, but that more samplings in the future are certainly necessary to assess adequately the impact of the different organic amendments.

scholarly journals Management of crotalaria and pigeon pea for control of yam nematode diseases

2008 ◽  
Vol 34 (3) ◽  
pp. 222-227 ◽  
Author(s):  
Marlon da Silva Garrido ◽  
Ana Cristina Fechino Soares ◽  
João Luiz Coimbra ◽  
Carla da Silva Sousa
Keyword(s):  
Dry Matter ◽  
Low Cost ◽  
Soil Surface ◽  
Pigeon Pea ◽  
Antagonistic Effect ◽  
Parasitic Nematodes ◽  
Plant Parasitic Nematodes ◽  
Fresh Matter ◽  
Plant Parasitic

Management of plant-parasitic nematodes with the use of nematicides has not been recommended for small farmers that grow yam in the Northeastern region of Brazil, due to its high cost and residue toxicity. The use of plants with antagonistic effect to nematodes and green manure which improves soil chemical, physical and biological characteristics can be a viable and low cost alternative to control parasitic nematodes. This work aimed to evaluate the effect of crotalaria (Crotalaria juncea) and pigeon pea (Cajanus cajan) plants on the control of yam nematodes. Three experiments were carried out. The first was conducted under in vitro conditions to evaluate the nematostatic and nematicide effect of extracts from fresh and dry matter of the above ground parts of crotalaria, pigeon pea, and the combination of both. The second experiment was carried out under greenhouse conditions to evaluate the effect of soil amendment with crotalaria, pigeon pea, and the combination of both in the infectivity of Scutellonema bradys, using tomato plants as the host plant. The third experiment was conducted under field conditions to evaluate the effect of crotalaria, pigeon pea, and the combination of both, cultivated between yam planting rows and incorporated to soil surface, on yam nematodes. The aqueous extract obtained form fresh matter of crotalaria had a nematicide effect of 100% for S. bradys. Extracts from dry matter of both crotalaria and pigeon pea did not have any nematicide effect, but had a nematostatic effect. Incorporation of crotalaria to soil inhibited infectivity of S. bradys in tomato seedlings. These results showed that planting crotalaria alone or in combination with pigeon pea, between the yam planting rows, is an efficient method for controlling S. bradys and Rotylenchulus reniformis associated with yams. Crotalaria can be used for controlling these plant-parasitic nematodes in soil.

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