Dare riri kumaodzanyemba kweBrazil nguva pfupi yadarika rakarayira kurambidzwa pakarepo kwe2,4-D, imwe yeanonyanya kushandiswa.mishonga yesoramunyika, mudunhu reCampanha Gaucha kumaodzanyemba kwenyika. Iyi nharaunda ndiyo hwaro hwakakosha pakugadzirwa kwewaini yakanaka nemaapuro muBrazil.
Mutongo uyu wakaitwa kutanga kwaGunyana vachipindura nyaya yakakwidzwa kudare nesangano revarimi reko. Sangano revarimi rakati mushonga uyu wakakuvadza minda yemizambiringa nemaapuro kuburikidza neagent drift. Zvinoenderana nemutongo, 2,4-D haizoshandiswa chero kupi munzvimbo yeCampanha Gaucha. Mune dzimwe nzvimbo dzeRio Grande do Sul, zvinorambidzwa kupfapfaidza mushonga uyu mukati me50 metres yeminda yemizambiringa neminda yemaapuro. Kurambidzwa uku kucharamba kuchishanda kudzamara hurumende yenyika yagadza hurongwa hwakakwana hwekutarisa nekuchengetedza mutemo, kusanganisira kumisikidza nzvimbo dzisingashandisi munzvimbo dzine njodzi.
Zviremera zvomunzvimbomo zvakapiwa mazuva 120 okushandisa gadziriro itsva. Kutadza kutevedzera kuchaita kuti pave nefaindi yemazuva ese ye10,000 reais (inenge zviuru zviviri zvemadhora ekuUS), iyo ichaendeswa kuhomwe yehurumende yemuripo wezvakatipoteredza. Mutongo uyu unodawo kuti hurumende ishambadze zvikuru chirambidzo ichi kuvarimi, vezvitoro zveagrochemical neveruzhinji.
2,4-D (2, 4-dichlorophenoxyacetic acid) yakashandiswa zvakanyanya kubva kuma1940, kunyanya muminda yesoya, gorosi uye chibage. Nekudaro, kusagadzikana kwayo uye maitiro ekukukurwa uchienda kunzvimbo dziri pedyo zvakaita kuti ive nzvimbo yegakava pakati pevarimi vezviyo nevarimi vemichero kumaodzanyemba kweBrazil. Minda yemizambiringa neminda yeapuro inonyanya kunzwisiswa nemakemikari aya. Kunyangwe kudonha kudiki kunogona kukanganisa zvakanyanya kunaka kwezvibereko, zvichikonzera mhedzisiro yehupfumi kune maindasitiri ewaini nemichero kunze kwenyika. Varimi vanotenda kuti pasina kutariswa kwakasimba, goho rose rinenge riri panjodzi.
Aka hakasi kekutanga kuti Rio Grande do Sul mangange pamusoro pe2,4-D. Zviremera zvenzvimbo iyi zvakambomisa kushandiswa kwemushonga wesora, asi ichi ndicho chimwe chezvirambidzo zvakanyanyisa kuitwa muBrazil kusvika parizvino. Nyanzvi dzezvekurima dzinoti nyaya yemutemo inogona kuisa muenzaniso wekuomesera kwemishonga yezvipembenene mune dzimwe nyika dzeBrazil, ichiratidza kusawirirana pakati pemhando dzakasiyana dzekurima: kurima zviyo zvakanyanya uye maindasitiri emichero newaini anovimba nemhando yechigadzirwa uye kuchengetedzwa kwezvakatipoteredza.
Kunyange zvazvo mutongo wacho uchigona kukwidzwa, mutemo we2,4-D ucharamba uchishanda kusvikira dzimwe sarudzo dzaitwa neDare Repamusoro.
Nguva yekutumira: Sep-17-2025