Cov kws tshawb fawb cov nroj tsuag xav tias cov ragweed loj heev tuaj yeem tsim kev tiv thaiv rau PPO tshuaj tua kab thaum ntxov li xyoo 2015. Kev tiv thaiv rau glyphosate hauv cov ragweed loj heev tau lees paub ntau dhau los, zoo li tiv thaiv ALS tshuaj tua kab. Tam sim no, University of Wisconsin-Madison cov kws tshawb fawb Felipe Faleco thiab Rodrigo Werle, ua haujlwm nrog Pat Tranel ntawm University of Illinois, tau lees paub tias cov pej xeem ntawm ragweed loj heev hauv Wisconsin pom nyob rau xyoo 2018 tau tiv taus PPO chemistry.
Raws li cov peev txheej, nws yog thawj qhov ua pov thawj tsis kam ntawm cov ragweed loj heev rau PPO Pawg 14 tshuaj tua tsiaj hauv ntiaj teb. Thiab nws kuj yog thawj zaug uas muaj ntau yam tshuaj tua kab mob tau sau tseg hauv Wisconsin.
Tranel coj txoj haujlwm molecular los txheeb xyuas cov txheej txheem ntawm kev tiv thaiv rau cov tshuaj tua kab mob. Cov kws tshawb fawb tau xaus lus tias kev hloov pauv caj ces nyob rau hauv hom ragweed loj heev yuav muab kev tiv thaiv hauv cov nroj tsuag rau PPO tshuaj tua kab.
Glyphosate tsis kam nyob rau hauv loj heev ragweed tau sau tseg nyob rau hauv Teb Chaws Asmeskas thiab Canada tau ntev. ALS tshuaj tua kab mob kuj tau nthuav dav. Cov kws tshawb fawb no tau pib lawv txoj kev tshawb nrhiav rau PPO tiv thaiv tom qab cov lus ceeb toom ntawm cov teeb meem tswj cov nroj tsuag nrog loj ragweed hauv Wisconsin xyoo 2018, uas tsis haum rau cov qauv kev tiv thaiv.
Lawv tau sau cov qauv hauv xyoo 2018 thiab ua haujlwm nrog ALS thiab PPO cov tshuaj tom qab tshwm sim hauv lawv cov kev tshawb fawb.
"Peb tau tso tseg kev ua pov thawj nws thaum dicamba-hloov thiab Enlist cov taum pauv nrog kev ua siab ntev rau 2,4-D tuaj txog vim peb paub tias lawv yuav tswj tau cov ragweed resistant loj heev," piav qhia Bill Johnson, Purdue tus kws tshaj lij tswj cov nroj tsuag. Yog li Johnson tsis xav tsis thoob tias lwm cov kws tshawb fawb nroj tsuag tam sim no lees paub qhov tsis kam rau PPO chemistry hauv ragweed loj.
Flexstar, PPO tshuaj tua kab mob, tau siv dav rau cov ragweed loj heev pib nyob ib ncig ntawm 2005, tom qab ntau tus neeg loj heev ragweed pom glyphosate tsis kam. Tom qab li tsib xyoos ntawm kev siv rau kev tswj hwm ragweed loj, Flexstar maj mam ua haujlwm tsis zoo, Johnson hais.
"Peb xav tias PPO tsis kam nyob rau hauv loj heev ragweed yog qhov yuav kis tau," nws sau tseg. "Nws yog lwm yam uas yuav tsum tau xav txog thaum tsim cov tswv yim tswj cov nroj tsuag rau cov ragweed loj."
Kev sib tw loj heev ragweed
Giant ragweed yog ib qho nyuaj rau txhua qhov chaw, tab sis tshwj xeeb tshaj yog nyob rau sab hnub tuaj pob kws siv. Johnson tau hais tias "Nws yog kab tias No. "Nws yog cov nroj tsuag loj-loj hlob, thiab nws loj hlob hauv ntau qhov dej ntws thoob plaws lub caij, tshwj xeeb tshaj yog tias koj tau txais los nag.
"Peb muaj cov tshuaj tua kab mob seem nrog kev ua si, tab sis tsis muaj cov kua txiv hmab txiv ntoo residual herbicide uas muaj txiaj ntsig zoo tiv thaiv nws. Ntxiv rau, cov tshuaj tua tsiaj seem tsis nyob mus ib txhis.
"Peb tuaj yeem ua tau zoo tom qab cog qoob loo hauv pob kws vim tias peb muaj cov tshuaj tua kab mob dicamba. Dicamba zoo heev tiv thaiv cov ragweed loj heev. Cov nroj no ib txwm nruj dua los tswj txhua lub caij ntev hauv cov taum, vim peb tsis muaj dicamba.
"Tam sim no, nws zoo nkaus li tias peb yuav tsis muaj qhov kev xaiv tom qab txawm tias hauv Xtend thiab Xtendflex soybeans. Peb cia siab tias yuav siv dicamba ua kev kub ntxhov."
Tswj cov ragweed loj heev hauv cov taum pauv
Nov yog Johnson qhov zoo tshaj plaws cov lus pom zoo ib ntus rau kev tawm tsam loj heev ragweed hauv ntau hom taum pauv:
Tsis-till, txo tillage. Txhawm rau tua cov nroj tsuag loj heev ragweed, xav txog kev hlawv ntawm dicamba lossis 2, 4-D ester. Johnson hais tias "ob qho tib si zoo heev ntawm cov ragweed loj heev," Johnson hais. "Peb tsuas yog cia siab tias yuav raug tso cai siv cov khoom lag luam dicamba soybean li burndowns hauv '25."
Koj kuj tseem xav xav txog ntxiv Sharpen kom tua cov nroj tsuag sai dua thiab khaws marestail, nws sau tseg.
Xtend thiab Xtendflex soybeans. Yog tias koj xaiv cov taum pauv nrog cov yam ntxwv no thiab siv 2,4-D hlawv, tos tsawg kawg xya hnub ua ntej cog, nyob ntawm cov lus qhia ntawm 2,4-D cov khoom siv, Johnson hais. Koj tuaj yeem thov XtendiMax, Engenia thiab Tavium dicamba cov khoom ua ntej ntawm cov taum mog nrog lub dicamba-hloov zoo yam tsis muaj sijhawm tos. Txawm li cas los xij, koj tsis tuaj yeem siv lwm yam khoom siv dicamba, xws li Banvel, Clarity thiab DiFlexx, ua ntej ntawm cov taum pauv yam tsis tau tos. Ib txwm nyeem cov ntawv ua ntej!
Sau 3 soybeans. Tsis muaj lub sijhawm tos ntawm kev txau pom zoo 2,4-D cov khoom lag luam thiab cog qoob loo Enlist E3. Tsis txhob siv dicamba ua ntej ntawm Enlist soybean ntau yam vim lawv tsis muaj dicamba kam rau ua.
Pa tilage. "Yog tias koj ua haujlwm hauv av thaum ntxov thiab loj ragweeds regrow ua ntej cog, tua lawv," Johnson hais. "Txawm hais tias txau lawv nrog hluav taws kub lossis txog thaum lawv tawm, tab sis tsis txhob quav ntsej lawv thiab cia siab tias yuav tswj lawv tom qab."
Lub sij hawm postemergence sprays
"Giant ragweed tau dhia thiab feem ntau mus txog qhov siab 4-inch ua ntej," Johnson sau tseg. "Lub sij hawm txau ib ncig ntawm thawj cov nroj tsuag mus txog 4 ntiv tes. Ntau tus neeg tos kom txog thaum tom qab cov nroj tsuag ncav cuag 4 ntiv tes, thiab tom qab ntawd cov ragweeds loj dua thiab hnyav dua los tswj."
Post, Enlist system. Npaj nrog 2,4-D thiab/lossis Liberty ntawm tus nqi tag nrho. "Tom qab ntawd koj tuaj yeem ntxiv glyphosate rau cov nyom, thiab nws yuav tau txais qee cov ragweeds loj heev - ntau yam tsis kam tiv thaiv glyphosate," Johnson hais. "Ntxiv ib pab pawg 15 tshuaj tua kab mob rau kev tswj cov dej hemp seem."
"Kev ywj pheej ua haujlwm ntawm cov ragweed loj, tab sis tsis zoo li 2, 4-D ntawm cov nroj tsuag loj."
Post, Xtend system. Kev ywj pheej yog qhov tseem ceeb riam phom yog ragweeds yog PPO resistant. "Yog li, tam sim no koj yuav tsum tau txais cov ragweed loj heev thaum lawv tseem me thiab tseem nyob ntawm daim ntawv lo," Johnson hais.
