2024 Tus sau: Chloe Blomfield | [email protected]. Kawg hloov kho: 2023-12-15 23:55
Downy chaw ntawm pecans yog kab mob fungal tshwm sim los ntawm tus kab mob Mycosphaerella caryigena. Thaum cov kab mob no tsuas yog tawm tsam cov nplooj ntoo xwb, kev kis mob hnyav tuaj yeem ua rau lub sijhawm ntxov defoliation uas cuam tshuam rau tag nrho lub zog ntawm tsob ntoo, yog li pecan downy chaw tswj yog qhov tseem ceeb rau kev noj qab haus huv ntawm tsob ntoo pecan. Yuav ua li cas kho pecan downy chaw? Cov kab lus hauv qab no muaj cov ntaub ntawv qhia txog cov tsos mob pecan downy thiab cov lus qhia rau kev kho tsob ntoo pecan nrog qhov chaw downy.
Pecan Downy Spot Symptoms
Downy qhov chaw ntawm pecan cov tsos mob feem ntau tshwm sim thaum lub Rau Hli mus txog thaum Lub Xya Hli. Thawj kab mob ntawm lub caij nplooj ntoos hlav tshiab nplooj stems los ntawm spores uas tau overwintered nyob rau hauv cov laus, cov nplooj tuag. Qhov tseeb kos npe ntawm tsob ntoo pecan nrog qhov chaw downy tshwm sim ze ntawm lub paj tawg thaum lub caij nplooj ntoo hlav.
Downy me ntsis tshwm nyob rau lub caij ntuj sov lig nyob rau hauv qab ntawm nplooj tshiab. Qhov kev poob siab no yog tshwm sim los ntawm ntau cov spores ntawm qhov chaw ntawm qhov txhab. Tom qab ntawd cov spores kis tau los ntawm cua thiab nag mus rau nplooj nyob ze. Thaum cov spores tau faib, cov kab mob tig daj daj. Tom qab lub caij ntuj no, cov pob me me no ua xim av vim kev tuag ntawm tes hauv cov kab mob lesion. Tom qab ntawd lawv coj ib tug frosty tsos thiab lubCov nplooj kab mob feem ntau poob ntxov ntxov.
Yuav ua li cas kho Pecan Downy Spot
Txhua cov qoob loo pecan yog me ntsis cuam tshuam rau qhov chaw qis, tab sis Stuart, Pawnee, thiab Moneymaker yog nyob deb ntawm qhov muaj kev phom sij tshaj plaws. Cov fungus ciaj sia lub caij ntuj no nyob rau hauv cov nplooj kab mob los ntawm lub caij dhau los thiab yog fostered los ntawm txias, pos huab hnub nrog nquag los nag.
Pecan downy chaw tswj yog nyob ntawm kev tiv thaiv cov tshuaj tua kab mob siv rau ntawm budbreak. Txawm hais tias daim ntawv thov cov tshuaj tsuag fungicidal yuav tsis tag nrho tswj pecan downy qhov chaw, tab sis nws yuav tsum txo tus kab mob thawj zaug.
Tshem tawm thiab rhuav tshem cov nplooj poob ntawm lub xyoo dhau los zoo ua ntej tawg. Tsis tas li ntawd, cov nroj tsuag resistant los yog siab ntev cultivars zoo li Schley, Success, Mahan, thiab Western. Hmoov tsis zoo, tej zaum koj yuav tau pauv ib qho teeb meem rau lwm qhov txij li Schley thiab Western yog qhov yooj yim rau pecan scab thaum Kev vam meej thiab Western muaj kev cuam tshuam rau shuck tuag.
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