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Performance of elite maize genotypes under fall armyworm artificial infestation in Kenya.

Geoffrey nyapom Author

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    Display nameGeoffrey Anyanda
    First nameGeoffrey
    Last nameAnyanda
    Emailanyandajeff2@gmail.com
    RoleResearcher
    CountryKenya
    OrganisationCIMMYT-Kenya
    Area of ResearchSocio-economics and Impact Assessment
    Describe your research

    Direct estimation of maize yield loss caused by fall armyworm using six CIMMYT genotypes in artificial and on natural infestation in major maize growing agro ecologies in Kenya. In addition, i conducted a trial on the life table of the fall armyworm in controlled conditions using the same genotypes as natural diet for the larvae as well as for the fecundity studies.

    ORCID iD
    Google Scholar Link
    Member sinceJuly 15, 2020
    Topics posted10
    Replies11
  • Topics Started

    • Performance of elite maize genotypes under fall armyworm artificial infestation in Kenya.
      January 20, 2021

    • Managing fall armyworm (FAW) in corn production in Indonesia-Malaysia-Thailand Growth Triangle (IMT-GT)
      January 19, 2021

    • New mobile phone app ‘Nuru’, which uses machine learning and artificial intelligence, offers some hope in tackling FAW
      December 28, 2020

    • Breakthrough is here. CIMMYT-Kenya introduces derived fall armyworm tolerant elite maize hybrids
      December 23, 2020

    • Fall Armyworm (FAW) prevention under the Framework of FAO Global Action on FAW control
      December 13, 2020

    • Can socio-economic and agro-ecological data be used to estimate food insecurity levels across house-holds in SSA as a function of exposure to FAW invasion risk, and vulnerability and lack of coping strategies among the exposed populations ?
      December 10, 2020

    • Communication is key: CABI publishes framework for strategic communications during pest outbreaks
      December 10, 2020

    • Addressing the impact of COVID-19 on global action for Fall armyworm control
      December 9, 2020

    • Can community surveys be a convenient tool for conducting accurate, quick and cost-efficient survey for estimation of yield loss caused by Fall armyworm?
      December 8, 2020

    • Somalia agriculture partners learn about integrated fall armyworm control practices
      December 7, 2020

  • Replies

    • In Kenya, 63% of women contribute to labor for weeding and 52% for harvesting as reported by Kassie in 2014. Recent paper by Hugo De Groote, women had more knowledge about fall armyworm, since they are more involved in farming management especially during vegetative stages where damage is more visible. See here : https://www.sciencedirect.com/science/article/abs/pii/S0305750X13002374# https://www.researchgate.net/publication/338500902_Spread_and_impact_of_fall_armyworm_Spodoptera_frugiperda_JE_Smith_in_maize_production_areas_of_Kenya
      January 21, 2021

    • Hello Steve This argument remains valid, especially with the sudden arrival of a dramatic invasive pest like FAW. The discussion can only be settled through a rigorous comparison of field trials with farmer estimates, preferably both with individual farmers and through community surveys. 
      January 8, 2021

    • The potential impact on the budding private seed sector in many countries in SSA further drag on attainment of the 2030 Agenda for Sustainable Development Goals, particularly of zero hunger, no poverty. Maize is attacked by FAW at virtually all the phenological stages of the maize thereby causing severe losses when the whorl is destroyed. At the later phenological stages larvae also feeds on the tassels, burrow into the cobs and destroy the kernels, as well as expose the cob to infection by microorganisms including the mycotoxin producing fungi. Such cobs are 100% lost as they become non-harvestable. Damage to maize seed production fields does not only affect the availability of seed to farmers in the following growing seasons but also becomes an additional barrier to the economic viability of the emerging private seed sector. A typical example would be on international trade , following establishment of FAW in Africa, the EU instigated emergency measures requiring strict phytosanitary controls in exporting countries to reduce the risk of the pest reaching Europe. I hope this answers your question.
      January 8, 2021

    • Hello @berice-imbayi thank you for your question.

      1. Yes its possible to estimate yield loss caused by FAW in regions where regional statistics are unavailable . See this paper https://www.researchgate.net/publication/338500902_Spread_and_impact_of_fall_armyworm_Spodoptera_frugiperda_JE_Smith_in_maize_production_areas_of_Kenya.
      2. In open field screening its not easy to have good control plots since pest occurrences are infrequent. Its would be advisable to collect all pests during harvesting and calculate the population density of each the pests. The population density would clearly show which pest had an impact on the yield. When choosing site location, FAW hotspots would be recommended.
      3. The action threshold level can be calculated by fitting regression equation Y = a + bx between the FAW population density and benefit cost ratio .Pest density corresponding to unit benefit cost ratio would be the economic injury level and the economic threshold levels set at 75% of EIL .Weekly economic injury levels can also be calculated from a formula : E = C/PDK, where C is the cost per hectare of an insecticide application, P is the market price of maize, D is the loss in yield per hectare at 100% infestation, and K is the reduction in pest attack achieved by control.

      December 17, 2020

    • Dear Steve Yes they had specific genotypes. pre-commercial tolerant genotypes, OPVs and commercial hybrids
      December 11, 2020

    • Hello Steve Thank for this question. Well a range of studies have estimated yield loss caused by FAW in Africa. Kumela et al. (2018) reported a yield loss of 47% in Kenya based on farmers perceptions. A recent study in Kenya reported 34% yield loss caused by FAW in the long rains of 2017 and 32% in both the short rains of 2017 and long rains of 2018 using community surveys (De Groote et al., 2020). Actual experimental yield loss are usually very infrequent due to pest occurrences and also establishing good control plots as you mentioned. However, CIMMYT-Kenya is currently working on the first Country-wide yield loss assessment caused by FAW. This results are expected to be out by the end of the year.
      December 11, 2020

    • Thank you @sharanu-deshmukhgmail-com for this. When conducting this study its also important to check the activity of natural enemies.
      December 9, 2020

    • Can augmentative releases of T. remus and T. chilonis in Africa effectively control the damage caused by FAW as compared to the full control ? In latin Latin America T. remus in maize fields showed 90% parasitism.
      December 8, 2020

    • Very useful information @sharanu-deshmukhgmail-com .Thank you for sharing this.
      December 8, 2020

    • The assessment of yield loss associated to FAW is crucial for sustainable management option in Nepal. Extension of knowledge on the identification of this pest is Key. Thank you for sharing this @ruchita-bhattarai .
      December 7, 2020

    1 2 Next »
  • Topics Following

    • Performance of elite maize genotypes under fall armyworm artificial infestation in Kenya.
      20 Jan 2021

    • Managing fall armyworm (FAW) in corn production in Indonesia-Malaysia-Thailand Growth Triangle (IMT-GT)
      19 Jan 2021

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  • Performance of elite maize genotypes under fall armyworm artificial infestation in Kenya.
    By Geoffrey Anyanda
    January 20, 2021
  • Your thoughts? Some reasons given against #GM crops to control #fallarmyworm: 1). Dominance by a few agricultural companies hence creating seed dependence as farmers have to buy from them. 2) Conserve genetic resources of the country and local seed varieties.
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  • Sundar Tiwari on Why farmers are reluctant to adopt cultural and other agro-ecological #fallarmyworm management practices? How extension workers and researchers support to promote these approaches?
    January 21, 2021
  • Sundar Tiwari on Elderly and female farmers are more likely prefer cultural/physical management practices for the fall armyworm management
    January 21, 2021
  • Sundar Tiwari on Elderly and female farmers are more likely prefer cultural/physical management practices for the fall armyworm management
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