Science-driven pest management saves cowpea farms from insect pests
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1 Science-driven pest management saves cowpea farms from insect pests Manuele Tamò, Clémentine Dabiré, Apolline Sanou, Fousseni Traoré, Djibril Aboubakar Souna, Hilaire Kpongbe, Amadou Laouali, Benjamin Datinon, Elie Dannon, Anne-Nathalie Volkoff, Baldwyn Torto, Barry Robert Pittendrigh, Ramasamy Srinivasan Feed the Future Innovation Lab for Collaborative Research on Grain Legumes Cowpea in Africa Food security & income crop for smallholder farmers in West Africa: 10M ha & 5.4M MT produced Genetic gains but insect pests remain the single greatest source of yield loss (50-80%) Currently, farmers use inappropriate and often highly toxic synthetic pesticides to fight the pests There are options to pest control! 1
2 Integrated Pest Management (IPM): no silver bullet approach Preventive interventions Improved plant resistance to pests Improved varieties (conventional breeding) Transgenics (Bt-cowpea) Improved ecosystems services Biological control Ecological engineering Curative interventions Application of pest-control products Bio-pesticides Semio-chemicals (attractants, repellants) Synthetic insecticides (last resort, targeted) One of the most devastating insect pests of cowpea in Africa: the legume pod borer, Maruca vitrata Attacks flowers and pods of various legumes, up to 80% yield loss, farmers resort to inappropriate pesticide applications 2
3 Why biological control and what science is needed?? Biodiversity studies: locally available natural enemies of Maruca vitrata in West Africa Phanerotoma leucobasis Braunsia kriegeri Egg parasitoids Trichogrammatoidea eldanae 0 Lc Ls Ps Pp Tp Vu Lc: Lonchocarpus cyanescens Ls: Lonchocarpus sericeus Ps: Pterocarpus santalinoides Phanerotoma leucobasis Pp: Pueraria phaseoloides Tp: Tephrosia plathycarpa Vu: Vigna unguiculata (cowpea) Non-host specific parasitoids, low and insufficient parasitism rates Arodokoun et al, 2006 M. vitrata What s about the origin of M. vitrata? Apanteles M. vitrata taragamae M. amboinalis Dolichogenidea sp. M. amboinalis Source: CABI Crop Protection Compendium Triclistus sp. Trichomma sp. Evidence of South Asian origin supported by latest population genetic studies (Periasamy et al, 2015) Much larger diversity of co-evolved natural enemies that need to be assessed for their performance using a biocontrol pipeline approach 3
4 How to feed the pipeline: novel biocontrol agents from the area of origin in Asia Perfect killer 2.0 After 2 years of confined testing: first experimental releases of the parasitic wasps (parasitoids) Therophilus javanus and Phanerotoma syleptae 4
5 What science is needed? Reproductive biology of the parasitoid Therophilus javanus Species Intrinsic rate of increase (r m ) Finite rate of increase (λ) Therophilus 0,24 1,27 javanus Phanerotoma 0,14 1,15 syleptae Maruca vitrata 0,19 1,20 Aboubakar Souna et al., in press What science is needed? Reproductive biology of the parasitoid Therophilus javanus Life stages of the parasitoid Therophilus javanus, dissected from developing pod borer Maruca vitrata caterpillars Aboubakar Souna et al., in press 5
6 Pre-release sensitization campaign at each of the release sites Experimental release sites 6
7 Experimental releases and backyard science Country Parasitoid # released Benin Therophilus javanus 41,600 Benin Phanerotoma syleptae 36,300 Burkina Faso Therophilus javanus 23,000 Burkina Faso Phanerotoma syleptae 18,500 Niger Therophilus javanus 3,000 Niger Phanerotoma syleptae 1,500 Total 123,900 and first data on establishment! Date Sites Host plant Maruca larvae P. syleptae P. leucobasis T. javanus 23/02/ Milletia /02/ Milletia /02/ Milletia /03/ Milletia /03/ Milletia /03/ Psophocarpus /03/ Pterocarpus /03/ Loncocarpus /03/ pterocarpus /03/ Milletia /03/ Lonchocarpus /03/ Milletia /03/ Pterocarpus /03/ Pueraria /03/ Pterocarpus /03/ Pterocarpus /03/ Pterocarpus /03/ Inconnue /03/ Pterocarpus /03/ Pterocarpus /03/ Feed the Milletia Future Innovation Lab 5 for Collaborative 0 Research on Grain 0 Legumes2 15/03/ Milletia /03/ Pterocarpus
8 Ultra-highthrouput cutteromics and scissoromics Choice of releases and recovery sites: Google earth! 8
9 Next steps and expected impact: Scaling out biocontrol approach to all major cowpea producing countries in West Africa, community-based production, involvement of private sector? Released parasitoids get established and control the pod borer on both natural vegetation and legume crops Overall M. vitrata population reduction of 40-60% depending on agro-ecological region 9
10 Collaboration with INERA and icipe to tackle a neglected yet important problem of pod sucking bugs from an ecological perspective Population dynamics of the pod bugs Clavigralla tomentosicollis and its egg parasitoid Gryon fulviventre NTpunaises Parasitisme (%) nov. janv. mars mai juil. sept. nov. janv. mars mai Empirically derived evidence of male aggregation pheromone emission 10
11 NTpunaises Parasitisme (%) nov. janv. mars mai juil Can we engineer a system where the egg parasitoids are attracted earlier in the season by the male aggregation pheromone and attack first generation egg masses? sept. nov. janv. mars mai 0 Abdomen Incubation: 3hours; T: -25 c Dissection GC-MS Thorax 100µl of extract Pentane extracts: 48hours 11
12 Profile of Clavigralla. tomentosicollis Kpongbe et al., manuscript in preparation Combination of electro-physiological response of both sexes to male headspace volatile w x y 12
13 Active compounds sources Female: 1 = a; 3 = b; 7 = c. Male: 3 = w; 7 = y. Next steps and expected impact: Development and deployment of management systems for augmenting egg parasitoid activity using aggregation pheromones (private Pheromone sector) dispenser Egg parasitoids control 1 st generation pod bug populations preventing extended damage Expected overall pod damage reduction of 60-80% depending on agro-ecological region 13
14 Thank you! 14
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