scholarly journals Distribution of main plant-parasitic nematodes in sweet potato and taro fields in Kyushu and Okinawa, Japan. 3. Survey in the northern part in Kyushu Island (Fukuoka, Saga, Nagasaki and Ohita Prefs.)

2003 ◽  
Vol 49 ◽  
pp. 83-87 ◽  
Author(s):  
Hideaki Iwahori ◽  
Zen-ichi Sano
Keyword(s):  
Sweet Potato ◽  
Parasitic Nematodes ◽  
Plant Parasitic Nematodes ◽  
Kyushu Island ◽  
Plant Parasitic

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 Plant-parasitic nematodes associated with sweet potato rhizosphere soil in the Semi- Deciduous Forest and Coastal Savannah Zones of Ghana

2020 ◽  
Vol 55 (2) ◽  
pp. 1-9
Author(s):  
J. Adomako ◽  
Y. Danso ◽  
B. Sakyiamah ◽  
F. Kankam ◽  
K. Osei
Keyword(s):  
Sweet Potato ◽  
Deciduous Forest ◽  
Potato Crop ◽  
Management Strategies ◽  
Soil Samples ◽  
Parasitic Nematodes ◽  
Plant Parasitic Nematodes ◽  
Negative Effects ◽  
Crop Development ◽  
Plant Parasitic

A survey was conducted in nine major sweet potato producing districts across the semi-deciduous forest and coastal savannah zones of Ghana to determine the prevalence of plant-parasitic nematodes parasitizing the crop. Soil samples were collected at 90-days after planting from the rhizosphere of sweet potato crop and analysed using Modified Baermann tray method from 100 farms across the study area. Seven plant-parasitic nematode genera were extracted from soil samples collected and morphologically identified under a microscope with four of them, namely Meloidogyne, Pratylenchus, Rotylenchulus, and Helicotylenchus being the most prevalent. Scutellonema sp. occurred in 89% while Tylenchus sp. occurred in 33% of the districts sampled. The ring nematode, Criconemella sp. was found in only two of the nine districts covered; Ketu North and Akatsi South which incidentally recorded 100% of the seven nematodes encountered in the survey. The abundant nematode was Meloidogyne sp. which represented 39% and Criconemella, the least (0.1%) of the total nematodes recovered in the survey. This study has shown that high diversity, incidence and density of economically important plant-parasitic nematodes are associated with sweet potato crop. Development of appropriate management strategies to mitigate the negative effects of plant-parasitic nematodes on sweet potato is recommended.  

A novel nematode diagnostic method using the direct quantification of major plant-parasitic nematodes in soil by real-time PCR

Nematology ◽  
2012 ◽  
Vol 14 (3) ◽  
pp. 265-276 ◽  
Author(s):  
Yu Yu Min ◽  
Koki Toyota ◽  
Erika Sato
Keyword(s):  
Real Time ◽  
Sweet Potato ◽  
Real Time Pcr ◽  
Extraction Method ◽  
Cyst Nematode ◽  
Parasitic Nematodes ◽  
Plant Parasitic Nematodes ◽  
Pcr Method ◽  
Plant Parasitic ◽  
Direct Quantification

We have developed a direct quantification method using real-time PCR for various plant-parasitic nematodes. Firstly, specific primers were designed for the root-knot nematode Meloidogyne incognita, the root-lesion nematode Pratylenchus penetrans, the potato cyst nematode Globodera rostochiensis and the soybean cyst nematode Heterodera glycines. A DNA extraction method was then developed beginning with 20 g of soil, a relatively large amount of soil but a necessary amount in the consideration of heterogeneous distribution of nematodes in soil. To estimate the density of the target nematode in soil, calibration curves for each plant-parasitic nematode were obtained by inoculating different numbers of the target nematode and then extracting DNA from the soils. The detection limit was 4-5 nematodes (20 g soil)−1. This method was applied to nematode diagnostics. Soil sampling was done when transplanting of radish and sweet potato in fields was taking place, and the density of plant-parasitic nematodes was measured using both the Baermann funnel extraction method and real-time PCR methods. In some soils, P. penetrans and M. incognita were not found with the Baermann method but were detected with the real-time PCR method. At harvest, damage to crops was evaluated and its relationship with initial densities was investigated. The real-time PCR method more precisely predicted damage to radish and sweet potato by nematodes and was considered to be a powerful tool in the diagnosis of nematode diseases.

Management of Plant-Parasitic Nematodes in Florida Cotton Production

EDIS ◽  
2017 ◽  
Vol 2017 (2) ◽  
pp. 8
Author(s):  
Zane Grabau
Keyword(s):  
Parasitic Nematodes ◽  
Cotton Production ◽  
Plant Parasitic Nematodes ◽  
Fact Sheet ◽  
Plant Parasitic

This 8-page fact sheet written by Zane J. Grabau and published in January 2017 by the UF Department of Entomology and Nematology explains how to diagnose and manage nematode problems in cotton production.­http://edis.ifas.ufl.edu/ng015

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