Masayendisiti pa US Forest Service's Pacific Northwest Research Station Portland, Oregon, vakagadzira modhi yekufanotaura kuputika kwebud. Vakashandisa Douglas firs mukuedza kwavo asi vakaongororawo tsvagiridzo yemamwe marudzi e100, saka vanotarisira kukwanisa kugadzirisa modhi yezvimwe zvirimwa nemiti.
Zvose zvinotonhora uye zvinodziya tembiricha zvinokanganisa nguva, uye musanganiswa wakasiyana unopa mhedzisiro dzakasiyana - kwete nguva dzose intuitive. Nemaawa akawanda ekutonhora kwekutonhora, miti inoda maawa mashoma ekudziya kuti iparadze. Saka kudziya kwekutanga kwechirimo kuchamhanyisa bud kuputika kare. Kana muti usina kutonhora zvakakwana, zvakadaro, unoda kuwedzera kudziya kuti uputika. Saka pasi pemamiriro ekunze anokatyamadza zvikuru, kutonhora kwechando kunogona kureva kuputika kwebukira.
Genes inotamba roll, zvakare. Vatsvagiri vakaedza naDouglas firs kubva mhiri kweOregon, Washington, neCalifornia. Miti kubva munzvimbo dzinotonhora kana dzakaoma yakaratidza kuputika kwekutanga. Miti inodzika kubva mumitsara iyo inogona kufamba zviri nani munzvimbo dzinogara hama dzavo dzinodziya-uye-dzakanyorova dzinogara iko zvino.
Chikwata ichi, chinotungamirwa neanoongorora masango Connie Harrington, chinotarisira kushandisa modhi iyi kufanotaura kuti miti ichapindura sei pasi pezvakasiyana fungidziro yemamiriro ekunze. Neruzivo irworwo, vatariri veminda vanogona kusarudza kuti vodyara kupi uye chii, uye, kana zvichidikanwa, kuronga nzira dzakabatsirwa dzekutama.