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Reproductive potential of fall armyworm Spodoptera frugiperda (J.E. Smith) and effects of feeding on diverse maize genotypes under artificial infestation

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 posted24
    Replies23
  • Topics Started

    • Reproductive potential of fall armyworm Spodoptera frugiperda (J.E. Smith) and effects of feeding on diverse maize genotypes under artificial infestation
      September 8, 2022

    • Integrated Management of Maize Insect-pests (CIMMYT/SATG 2021 Webinar Series, session 2)
      August 12, 2021

    • Developing smallholder-oriented IPM strategies for fall armyworm management- Conference
      June 21, 2021

    • Webinar series: FAW monitoring and early warning systems in Africa
      June 21, 2021

    • Free Learning Modules for Fall Armyworm (FAW) Mitigation
      June 11, 2021

    • Free Learning Modules for Fall Armyworm (FAW) Mitigation
      June 11, 2021

    • Global Action for Fall armyworm control Webinar.
      May 11, 2021

    • FAW webinar workshop series: Why is the development of a regional resistance management plan for Southeast Asia critical for controlling fall armyworm over the long term?
      April 16, 2021

    • China develops “the007” variety of genetically modified corn to fight invasive Fall armyworm
      April 13, 2021

    • Fall Armyworm Training Modules Public Launch by AGRA and its partners
      March 9, 2021

    1 2 3 Next »
  • Replies

    • Thank you @marckenis
      February 1, 2021

    • This is very impressive work. Were the two studies done in the same locations in Ghana?
      January 31, 2021

    • 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

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