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  1. Article ; Online: Cassava pest and disease management

    Herren, H.

    an overview

    2018  

    Abstract: The International Institute of Tropical Agriculture (IITA), the Centro International de Agricultura Tropical (CIAT), and many national agricultural research systems (NARS) have devoted considerable attention to cassava improvement. However, many biotic ... ...

    Abstract The International Institute of Tropical Agriculture (IITA), the Centro International de Agricultura Tropical (CIAT), and many national agricultural research systems (NARS) have devoted considerable attention to cassava improvement. However, many biotic constraints still limit the expansion of this crop in many tropical areas. Host plant resistance and biological control are the cornerstones of crop protection measures against biotic stresses on cassava (Manihot esculenta L.) Genetic improvement has focused on African cassava mosaic disease, cassava bacterial blight and anthracnose diseases. Management of the cassava mealybug and the cassava green mite has been highly successful using parasitoids natural enemies introduced from Latin America, the original home of cassava. Sustainable plant health management (PHM) that considers the crop plant as a component of an agro-ecosystem holds promise for management of diseases and pests on cassava.
    Keywords biological control ; host plants ; resistance varieties ; manihot esculenta
    Language English
    Publishing date 2018-09-14T07:37:48Z
    Publishing country fr
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Conference proceedings ; Online: Coordination of biological control efforts against the larger grain borer

    Herren, H.R.

    2019  

    Keywords biological control
    Language English
    Publishing date 2019-06-25T17:09:15Z
    Publishing country fr
    Document type Conference proceedings ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Biological control as the primary option in sustainable pest management

    Herren, H.R.

    the cassava pest project

    2019  

    Abstract: The cassava mealybug (CM), Phenacoccus manihoti Matile-Ferrero was unknown to science when it was first discovered in 1973, along the Congo-Zaire river in Central Africa. In 1981, following inten sive exploration and taxonomie studies, CM was found to ... ...

    Abstract The cassava mealybug (CM), Phenacoccus manihoti Matile-Ferrero was unknown to science when it was first discovered in 1973, along the Congo-Zaire river in Central Africa. In 1981, following inten sive exploration and taxonomie studies, CM was found to have originated from a limited area of South America, from where it was accidentally introduced to Africa in the late 1960s or early 1970s. In 1971, the cassava green mite (CGM), Mononychellus tanajoa (Bondar) was discovered in Uganda; it has its origin also in South America. Since then, the pests have spread over most of the cassava belt of Africa, threatening to destroy cassava, the staple food crop of some 200 million Africans. Classical biological control through the use of exotic natural enemies, provides the basis for an economically viable and environmentally sound solution. Also, this approach is particulary, but not exclusively, appropriate for low-input, subsistence agricultural systems since it requires little or no intervention by individual farmers or agricultural extension services. The extreme urgency of the problem, with its attendant threat of widespread famine, called for an unprecedented level of or ganization and international cooperation. Exploration, ecological and biological studies of natural enemies, the development of appropriate mass-rearing and distribution technologies, and a major program of manpower training, were undertaken through the formation of an extensive network of scientific collaborators in Africa, Europe and the Americas. Finally, follow-up studies, underpinned by the development of a simulation model and a benefit/cost analysis, have demonstrated that classi cal biological control, properly planned and implemented, can provide a timely, cost effective and ecologically safe solution to a major pest problem.
    Keywords cassava ; biological control ; pest management
    Language English
    Publishing date 2019-06-25T17:09:15Z
    Publishing country fr
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: The Africawide Biological Control Program

    Herren, H.R.

    2019  

    Keywords cassava ; biological control ; pest management
    Language English
    Publishing date 2019-06-25T17:09:17Z
    Publishing country fr
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Functional responses of Neoseiulus idaeus and Iphiseius degenerans (Acarina

    Akpokodje, G. / Odebiyi, J. / Ochieng, R. / Herren, H.

    Phytoseiidae) feeding on the cassava green mite, Mononychellus tanajoa (Acarina: Tetranychidae)

    2018  

    Abstract: The functional responses of larva and female Iphiseius degenerans BERLESE and protonymph and female Neoseiulus idaeus (DENMARK & MUMA) were determined with different developmental stages of the cassava green mite (CGM), Mononychellus tanajoa BONDAR, as ... ...

    Abstract The functional responses of larva and female Iphiseius degenerans BERLESE and protonymph and female Neoseiulus idaeus (DENMARK & MUMA) were determined with different developmental stages of the cassava green mite (CGM), Mononychellus tanajoa BONDAR, as food supplied at densities of 1, 2, 5, 10, 20, 30, 40, and 50 individuals per 3,14cm² cassava leaf disc arena. All functional responses obtained were of the Holling's Type II curve with the highest plateaux when adult females of both N.idaeus and I. degenerans were preying on CGM eggs. Mean highest number of 14.3 CGM eggs/5-hours consumed by a female N. idaeus was not significantly different from the 13.0CGM eggs/5-hours of I. degenerans. There was a significant non-linear positive correlation between predator's search rate and prey density in all treatments. Larvae of I. degenrans displayed a unique search rate curve apparently associated with its non-obligatory predatory nature.
    Keywords economic importance ; predators ; cassava ; mealybugs ; arthropods
    Language English
    Publishing date 2018-12-19T07:01:21Z
    Publishing country fr
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Cytokine quantification and association with cervical length in a prospective cohort of pregnant women.

    Herren, Helmer / Marcolin, Alessandra C / Barbieri, Marco A / Bettiol, Heloisa / Cardoso, Viviane C / Quintana, Silvana M / Cavalli, Ricardo C

    BMC pregnancy and childbirth

    2023  Volume 23, Issue 1, Page(s) 458

    Abstract: Background: Preterm birth is a leading cause of infant morbidity and mortality; its multifactorial causes are an obstacle to understanding etiology and pathogenesis. The importance of cytokines and inflammation in its etiology and association with the ... ...

    Abstract Background: Preterm birth is a leading cause of infant morbidity and mortality; its multifactorial causes are an obstacle to understanding etiology and pathogenesis. The importance of cytokines and inflammation in its etiology and association with the short cervix is nowadays well-proven. To date, there are no reliable biological or biochemical markers to predict preterm birth; even though the length of the cervix has high specificity, its sensitivity with the cervix below 2.5 cm is low.
    Objective: We study the association of plasma cytokine levels and cervical length in search of predictors of preterm birth.
    Study design: We evaluated a total of 1400 pregnant women carrying a single fetus between 20 and 25 weeks of gestation, and 1370 of them after childbirth in a nested case-control study of a prenatal cohort. Eligible pregnant women were interviewed and submitted to obstetric morphological and transvaginal ultrasound with cervical length measurement, gynecological examination, and blood collection. Preterm birth occurred in 133 women, 129 included in the study, and a control group randomly selected at a 2:1 ratio. A total of 41 cytokines with a higher probability of being associated with preterm birth or being of significance during labor were determined.
    Results: Cytokine and cervical length analysis by multivariate analysis of the conditional interference tree revealed that growth-related oncogene values of less than 2293 pg/mL were significantly associated with a cervical length of less than 2.5 cm.
    Conclusions: As well as a cervical length shorter than 2.5 cm, growth-related oncogene levels of less than 2293 pg/ml may be associated with an increased risk of PB. Analysis based on the association of biomarkers and of the interaction between cytokines is a promising pathway in search of a predictor of preterm birth.
    MeSH term(s) Pregnancy ; Female ; Infant, Newborn ; Humans ; Premature Birth/diagnosis ; Cervix Uteri/anatomy & histology ; Pregnant Women ; Prospective Studies ; Case-Control Studies ; Cervical Length Measurement ; Parturition
    Language English
    Publishing date 2023-06-20
    Publishing country England
    Document type Journal Article
    ZDB-ID 2059869-5
    ISSN 1471-2393 ; 1471-2393
    ISSN (online) 1471-2393
    ISSN 1471-2393
    DOI 10.1186/s12884-023-05776-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Biological control of cassava pests in Africa

    Herren, H.R. / Neuenschwander, P.

    2019  

    Keywords phenacoccus manihoti ; mononychellus tanajoa ; pests ; diseases
    Language English
    Publishing date 2019-06-25T17:09:03Z
    Publishing country fr
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Book ; Online: La lutte biologique contre le grand capucin du mais; comptes rendus dune reunion de coordination IITA/FAO tenue les 2 et 3 juin 1989 a Cotonou, (Republique du Benin)

    Markham, R.H. / Herren, H.R.

    2019  

    Keywords maize ; biological control
    Language English
    Publishing date 2019-06-25T17:09:17Z
    Publishing country fr
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Book ; Online: La lutte biologique

    Yaninek, John S. / Herren, H.R.

    une solution durable aux problemes poses par les depredateurs des cultures en Afrique

    2019  

    Keywords biological control ; natural enemies ; insect pests ; sustainable agriculture
    Language French
    Publishing date 2019-06-25T17:09:18Z
    Publishing country fr
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Conference proceedings ; Online: Biological control of the larger grain borer

    Markham, R.H. / Herren, H.R.

    2019  

    Keywords biological control ; integrated pest management ; on-farm storage ; maize ; prostephanus truncatus ; insect pests
    Language English
    Publishing date 2019-06-25T17:09:14Z
    Publishing country fr
    Document type Conference proceedings ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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