scholarly journals Determination of Socio-economic Influence of Tillage and Termite on Incidence, Severity and Yield of Cassava (Manihot esculenta Crantz) in Selected Owerri Agricultural Zones, Southeast Nigeria

2019 ◽  
pp. 1-8
Author(s):  
K. O. Ogbedeh ◽  
T. T. Epidi ◽  
S. A. Dialoke ◽  
B. O. Bosah ◽  
C. A. Emenyonu ◽  
...  
Keyword(s):  
Manihot Esculenta ◽  
High Water ◽  
Field Investigation ◽  
Descriptive Statistics ◽  
Manihot Esculenta Crantz ◽  
Southeastern Nigeria ◽  
Questionnaire Administration ◽  
Cassava Production ◽  
Selection Of

The field investigation was conducted in 2015 in four selected Agricultural zones of Owerri, Southeastern Nigeria namely Ezinnihite Mbaise (Zone 1), Owerri North (Zone 2), Mbaitoli (Zone 3) and Owerri West (Zone 4). A random selection of thirty cassava farmers from each of the study areas was made. The sample size was made up of a total of one hundred and twenty (120) respondents. Data were collected through structural questionnaire administration to the respondents on the four selected zones and were analyzed using Descriptive Statistics such as the use of Percentages, Frequencies and Means. Result indicates that majority of the respondents sampled in this study practiced mounding for their cassava production. Also greater proportion of them (respondents) claimed that apart from other known endemic pests like grasshopper, mealybug, green mites etc., termite poses greater threat to their cassava farm. However, highest cassava yield occurred in areas where mounds and/or ridges were practiced. In view of the prevailing high water table of the sampled areas, farmers are advised to continue with the practice of mounding and/or ridging for their cassava production.

ANALYSIS OF GENETIC DIVERSITY OF 26 CASSAVA VARIETIES (Manihot esculenta CRANTZ) WITH DIFFERENT RESPONSES TO WATERLOGGING CONDITIONS BY USING RAPD MARKERS

2021 ◽  
Vol 66 (3) ◽  
pp. 170-179
Author(s):  
Sengsoulichan Dethvongsa ◽  
Vu Nguyen Anh ◽  
Van Tran Khanh
Keyword(s):  
Genetic Diversity ◽  
Phylogenetic Tree ◽  
Manihot Esculenta ◽  
Rapd Markers ◽  
Flood Tolerance ◽  
Randomly Amplified Polymorphic Dna ◽  
Manihot Esculenta Crantz ◽  
Rapd Pcr ◽  
Cassava Production ◽  
Cassava Varieties

RAPD (Randomly Amplified Polymorphic DNA) is an indicator for high and stable polymorphism, widely used in the study of the diversity of cassava. In this paper, the results of using 20 polymorphic primers OPK combined with the establishment of the phylogenetic tree to analyze the genetic diversity of 26 cassava varieties with different responses to waterlogging conditions by using the RAPD-PCR technique were presented. The purpose of this experiment was to show the genetic relevance of the studied cassava varieties. The results showed that the flood tolerance of cassava was not related to the polymorphism and branching characteristics of the stem. This information may be use as a basis for selecting flood-tolerant cassava varieties for cassava production, as well as the basis for selecting genetically different parents for breeding.

scholarly journals Selection of cassava (Manihot esculenta Crantz) genotypes based on agro-morphological traits in Angola

2019 ◽  
Vol 14 (7) ◽  
pp. 447-460
Author(s):  
Domingos Joao Afonso Sandra ◽  
Alberto da Silva Ledo Carlos ◽  
Franco Cunha Moreira Ricardo ◽  
da Silva Santos Vanderlei ◽  
Peixoto Borges Viviane ◽  
...  
Keyword(s):  
Manihot Esculenta ◽  
Morphological Traits ◽  
Manihot Esculenta Crantz ◽  
Selection Of

scholarly journals Determinants of Adoption of Cassava Technologies by Male Farmers in Nasarawa State, Nigeria

1970 ◽  
Vol 19 (1) ◽  
pp. 117-127
Author(s):  
ME Ejechi
Keyword(s):  
Sampling Technique ◽  
Descriptive Statistics ◽  
Logit Regression ◽  
Multi Stage ◽  
Cassava Production ◽  
Production Technologies ◽  
Logit Regression Model ◽  
Very High ◽  
Selection Of ◽  
Structured Questionnaire

The study investigated determinants of adoption of recommended cassava production technologies among male farmers in Nasarawa State. Multi-stage sampling technique was employed for the selection of the respondent. Structured questionnaire was used for data collection. The data were collected from 60 male cassava farmers selected from 6 out of 13 LGAs in the State. They were Karu, Kokona, Akwanga, NasarawaEggon, Lafia and Obi. Data were analysed with both descriptive and inferential statistics. Descriptive statistics such as frequency tables, and percentage were used to describe socio-economic characteristics of the respondents. Logit regression model was used to estimate the determinants of adoption of these practices. The results showed that awareness and adoption of these practices were very high (Awareness of all the practices ranges from 90% to 98.3% while the adoption is from 63.3% to 90%). Factors that positively and significantly influenced adoption by male farmers were income (p=0.01) and extension contact (p=0.1). The conclusion was that men made remarkable contribution in cassava production. It was recommended that Governments at all levels formulate policies aimed at encouraging and motivating male cassava farmers. Provision of loans to male farmers and subsidizing of inputs should be ae necessary. Cassava processing industries should be established to add value and increase income.Keywords: Adoption, Cassava Technologies, Male farmers.

scholarly journals KEMAMPUAN REPRODUKSI TUNGAU PREDATOR FAMILI PHYTOSEIIDAE PADA BERBAGAI KEPADATAN TETRANYCHUS URTICAE DAN POLEN TANAMAN DI SEKITAR TANAMAN SINGKONG (MANIHOT ESCULENTA CRANTZ)

2012 ◽  
Vol 12 (2) ◽  
pp. 129-137
Author(s):  
Bambang Heru Budianto ◽  
Achmad Munadjat
Keyword(s):  
Survival Rate ◽  
Manihot Esculenta ◽  
Research Method ◽  
Predatory Mites ◽  
Predatory Mite ◽  
Ageratum Conyzoides ◽  
Manihot Esculenta Crantz ◽  
Development Period ◽  
Experimental Laboratory

The predatory mite of Phytoseiidae family have extensive cruising range that is not only found in cassava, but also a variety of weeds in cassava plants, such as Ageratum conyzoides and Cyperus cyperus. Extensive cruising range is also well explain the survival rate of the Phytoseiidae family at the time of the density of T. urticae decreased. The research objective is to determine the development period, fecundity and survival rate of Phytoseiidae predatory mite populations at different relative densities T. urticae and pollen. The research method used is an experimental laboratory. The procedure include the provision of A. conyzoides and C. rotundus pollen, the multiplication of predatory mite families Phytoseiidae, the determination of the development period, fecundity and survival rate of predatory mite families Phytoseiidae. The results showed that the length of time the development of predatory mites Amblyseius sp. and Phytoseius sp. faster one day of feeding on egg T. urticae feeding compared to the two types of pollen. Predatory mites survival rate Phytoseius sp. higher than the predatory mites Amblyseius sp. eggs fed T. urticae and both types of pollen. Similarly, the fecundity Phytoseius sp. higher than the mites Amblyseius sp. either fed eggs T. urticae as well as to two types of pollen.

scholarly journals Genetic Diversity of Cassava (Manihot esculenta Crantz) in Ecuador by Using SSR Markers

2021 ◽  
Author(s):  
Nelly Paredes ◽  
Valeria Alulema ◽  
Luis Lima ◽  
Marten Sørensen ◽  
and Álvaro Monteros-Altamirano
Keyword(s):  
Genetic Diversity ◽  
Manihot Esculenta ◽  
Staple Food ◽  
Ethnic Communities ◽  
Manihot Esculenta Crantz ◽  
Wide Range ◽  
Ssr Primers ◽  
Amazonian Region

Cassava (Manihot esculenta Crantz), domesticated in the Amazonian region of South America, presents an important diversity in Ecuador, where it is a main staple food; however, only few Ecuadorian cassava accessions have been included in international molecular assessments. The purpose of this study was to apply suitable cassava mi-crosatellites to characterize the genetic variability of the Ecuadorian cassava collection composed mainly of local landraces from the Coast, Andes and Amazonia regions. The use of microsatellite markers allowed the determination of the genetic diversity of the collection. Seven selected SSR primers, permitted to identify homozygous and hetero-zygous materials within the cassava collection of 133 accessions. The loci presented an average genetic diversity value of 0.7 and an average PIC value of 0.67, which is con-sidered high. Low number of duplicates (8.8%) were identified in the Ecuadorian col-lection which is not fully duplicated at CIAT. Currently, a wide range of cassava diver-sity is still cultivated in multi-crop agro-ecosystem, mainly in the Coast and Amazo-nian regions. Especially in the Amazonian region, due to important cultural uses of cassava by local ethnic communities, more in depth studies in the region could unveil the genetic diversity present in situ today.

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