Inkundla yaseBrazil iyalele ukuvalwa kweyeza lokutshabalalisa ukhula i-2,4-D kwindawo ebalulekileyo yewayini kunye ne-apile emazantsi.

Inkundla esemazantsi eBrazil kutshanje iyalele ukuvalwa ngoko nangoko kwi-2,4-D, enye yezona zisetyenziswa kakhuluimichiza yokutshabalalisa ukhulakwihlabathi, kwingingqi yaseCampanha Gaucha kumazantsi elizwe. Lo mmandla usisiseko esibalulekileyo kwimveliso yewayini ecolekileyo kunye nama-apile eBrazil.

Esi sigwebo senziwe ekuqaleni kweyoMsintsi kuphendulwa isimangalo esifakwe ngumbutho wamafama asekuhlaleni. Umbutho wamafama ubanga ukuba le khemikhali ibangele umonakalo kwizidiliya kunye nama-apile ngenxa ye-agent drift. Ngokutsho kwesigwebo, i-2,4-D ayiyi kusetyenziswa naphi na kwindawo yaseCampanha Gaucha. Kweminye imimandla yaseRio Grande do Sul, akuvumelekanga ukutshiza lo mchiza wokutshabalalisa ukhula phakathi kweemitha ezingama-50 zezidiliya kunye nama-apile. Esi sithintelo siya kuhlala sisebenza de urhulumente welizwe aseke inkqubo epheleleyo yokubeka iliso kunye nokuthotyelwa komthetho, kuquka nokumisela iindawo ezingasetyenziswayo kwiindawo ezinobungozi obukhulu.

Amagunya asekuhlaleni anikwa iintsuku ezili-120 zokuphumeza le nkqubo intsha. Ukungaphumeleli ukuthobela kuya kubangela isohlwayo semihla ngemihla se-10,000 reais (malunga ne-2,000 yeedola zase-US), eya kudluliselwa kwingxowa-mali yembuyekezo yendalo. Esi sigwebo sikwafuna ukuba urhulumente asibhengeze ngokubanzi esi sithintelo kumafama, abathengisi be-agrochemical kunye noluntu.

I-2,4-D (2, 4-dichlorophenoxyacetic acid) isetyenziswe ngokubanzi ukususela ngo-1940, ngokukodwa kwiimbotyi zesoya, ingqolowa kunye nengqolowa. Nangona kunjalo, indalo yayo eguquguqukayo kunye notyekelo lokukhukuliseka kwiindawo ezikufutshane yenze ukuba ibe yeyona nto iphambili kwimpikiswano phakathi kwabavelisi beenkozo kunye nabavelisi beziqhamo kumazantsi eBrazil. Izidiliya kunye nama-apile achukumiseke kakhulu kule khemikhali. Nokuba ukukhukuliseka okuncinci kunokuchaphazela kakhulu umgangatho weziqhamo, kubangele iziphumo ezibalulekileyo zezoqoqosho kumashishini athumela iwayini kunye neziqhamo. Abalimi bakholelwa ukuba ngaphandle kokubekwa kweliso olungqongqo, sonke isivuno siya kuba sesichengeni.

Esi ayisosihlandlo sokuqala ukuba iRio Grande do Sul ibambene ngo-2,4-D. Abasemagunyeni basekuhlaleni babekhe bakunqumamisa ukusetyenziswa kwesi sibulali zinambuzane, kodwa lo sesinye sezona zithintelo zingqongqo eziphunyeziweyo eBrazil ukuza kuthi ga ngoku. Iingcali zezoLimo zithi ityala lomthetho lingamisela umzekelo wolawulo olungqongqo lwezitshabalalisi kwamanye amazwe aseBrazil, liqaqambisa ukungavisisani phakathi kweemodeli ezahlukeneyo zezolimo: ukulima okuziinkozo okumandla kakhulu kunye nemveliso yeziqhamo newayini exhomekeke kumgangatho wemveliso kunye nokhuseleko lokusingqongileyo.

Nangona isigwebo sisenakho ukubhena, umyalelo we-2,4-D uya kuhlala usebenza de ezinye izigqibo zenziwe yiNkundla ePhakamileyo.