“…Plant-parasitic nematodes were counted and expressed as nematodes per 200 cm 3 of soil. For each genus, percent frequency was calculated as the total number of samples in which a particular nematode genus was detected, divided by the total number of samples collected and multiplied by 100 (Osei et al, 2005) to express as a percentage. The relative abundance (RA) of the nematode genus was determined as the sum of nematodes for all samples containing that genus divided by the number of positive samples (Osei et al, 2005).…”
Section: Nematode Extraction and Identificationmentioning
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.
“…Plant-parasitic nematodes were counted and expressed as nematodes per 200 cm 3 of soil. For each genus, percent frequency was calculated as the total number of samples in which a particular nematode genus was detected, divided by the total number of samples collected and multiplied by 100 (Osei et al, 2005) to express as a percentage. The relative abundance (RA) of the nematode genus was determined as the sum of nematodes for all samples containing that genus divided by the number of positive samples (Osei et al, 2005).…”
Section: Nematode Extraction and Identificationmentioning
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.
“…The poikilothermic, microscopic pests and plant parasitic nematodes are also of significant agronomic importance (Dickson and De Waele, 2005). In Ghana, Osei et al (2005) reported the infestation of groundnut fields by plant parasitic nematodes in a nationwide survey. Many nematode species have been reported to negatively affect the production of groundnut.…”
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