augmentatives on-farm releases of parasitoid wasps, habrobracon hebetor for the biological control...
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Augmenta)veson-farmreleasesofparasitoidwasps,HabrobraconhebetorforthebiologicalcontrolofthemilletheadminerHeliocheilusalbipunctella
- Theparasitoidswerereleasedin15cm×25cmjutebags(+200gofmilletgrains+100gofmilletflour+25larvaeofthericemothCorcyracephalonica(Stainton)+twomatedH.hebetorfemales)
- Parasitoidoffspring’sescapedthroughthejutemeshesanddispersedtoparasiEzeMHMlarvaeinmilletfields
- Upto80%parasiEsmofMHMwasrecordedaMeraugmentaEvereleases(Fig1)
- To make the biological control program sustainable,parasitoidsneedtobeavailableforeveryyearuse
- Therefore, on-going opEons are to establish a coSageindustrytoscaleupparasitoidsproducEon
- Thus, parasitoid producEon needs to be opEmized tomake the coSage industry viable and meet farmersneeds
- Since 2013 different experiments are being carried outtofine-tuneandstandardizerearing/releasestechniquesforH.hebetorforindustrialuse
- Highest producEon of parasitoid is achieved when H.
hebetor aregiven later larval stageofC.cephalonica toparasiEze
- Honey and sugar soluEon are the best mediumsupporEnglongestparasitoidlifespan(uptoonemonth)foruseinaEmermanner
- OpEmal Eme for maEng, egg ferElizaEon, and highestprogeny producEon is achieved when females areconfinedwithmalesfor24hin30mlcapacityvial
- Parasitoid numbers can be increased by 50% whenaddingasmallproporEonofcowpeaflourtothemillet-baseddietofC.cephalonicalarvae
- Different numbers of parasitoids were released in 24villages in two districts of Niger in 2014 to idenEfynumbersneededpermilletacreageforeffecEvecontrolofMHM
- Releases of the parasitoids significantly increased theparasiEsmofMHMascomparetocontrolvillages(Fig2)
- Significantly higher parasiEsm was recorded in villageswhere1600parasitoidwerereleased(Fig2)
Themilletheadminer(MHM),Heliocheilusalbipunctella(deJoannis)(Lepidoptera:Noctuidae),isoneofthekeyinsectpestofpearlmilletintheSahelregion.- Damagetothecropisdueto
larvaethatfeedonthepanicle- Typicalyieldlossesrangefrom40
to85%- Differentapproaches,including
culturalmanagement,hostplantresistanceanduseofpesEcides,havebeentestedwithlimitedsuccessandapplicability
- NaturalparasiEsmof64-95%duetoHabrobracon(=Bracon)hebetorSay(Hymeoptera:Braconidae)isreported
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%Parasi)zedlarvae
Tera Maradi
ThisworkhasbeenfundedbytheSorghumandmilletInnova)onlab(SMIL)andtheMcKnightfounda)on.IthasbeenundertakenaspartoftheCGIARresearchprogramonDrylandCereals.
H.hebetordevelopingonlarvaeofMHM
DevelopinglarvaeofMHM
Releasesofparasitoidwithjutebags
• INTRODUCTION
• AUGMENTATIVESRELEASES
• WAYFORWARD
• RESULTS
Discussions with farmers have established the “publicgood” nature of distribuEng the parasitoids. In otherwords, if one farmer adopts, his/her neighbours benefitwhichcouldaffectswillingnesstoadoptthetechnology.ItappearsthatthesoluEonistoestablishcommunity-basedbusinesses that sell to farmers’ groups for the wholecommunityinmulEplevillages.
MMHlarvaeparasiEzedbyH.hebetorinvillagescoveredbyreleasesofH.hebetorandcontrolvillagesinBurkinaFasoandNiger MMHlarvaeparasiEzedbyH.hebetorinvillagescovered
byreleasesofdifferentnumbersofH.hebetorandcontrolvillagesintwodistrictsofNigerin2015
1BaN.M.,2BaouaI.,3KaboreA.,4AmadouL.,1KarimouneL.,1SalhaH.,3DabireL.C.,5MuniappanR.1ICRISAT-Niger;2UniversityMaradi-Niger;3INERA-BurkinaFaso;4INRAN-Niger,5VirginiaTech,USA
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BurkinaFaso Niger
%parasi)zedlarvae
H.hebetorreleasesvillagesControl(noreleases)
Fig1:Fig2:
• CONCLUSION