Mawanga a masamba otuwa amatchedwanso mawanga a masamba a sesame ndi alimi amasamba polima.Zimawononga kwambiri masamba, ndipo zikavuta kwambiri, ma petioles amawonongekanso.Kumayambiriro kwa matendawa, masamba amakutidwa ndi timadontho tating'ono tofiirira.Zotupazo zimakhala zonyowa m'madzi komanso zosakhazikika.Pakatikati mwa zotupazo ndi imvi-bulauni mpaka chikasu-bulauni.Mphepete mwa zotupazo ndi ma halos achikasu-bulauni.Ziphuphuzo zimamira ndi 2 mpaka 5 mm m'mimba mwake., zotupazo zimakhala zosavuta kung'ambika pambuyo pake.

【Zizindikiro Zachilendo】 Zotupazo ndi mawanga ozungulira ofiira-bulauni.Kumayambiriro koyambirira, masamba amawonetsa mawanga ang'onoang'ono ozungulira ofiira.Pakatikati pa chilondacho ndi imvi yowala, ndipo halo ya bulauni imawonekera mbali ndi mbali.Zotupazo ndi zazikulu pang'ono kuposa tsamba la imvi ndipo mtundu wake ndi wowala.Pambuyo pakukula, zotupazo zimakhala mawanga ozungulira a bulauni ndipo masamba amasanduka achikasu.Katetezedwe ndi kuchiza mawanga a bulauni ndi chimodzimodzi ndi mawanga a masamba.

【Choyambitsa matendawa】Pathogen overwinters m'minda ngati mycelium ndi matenda amakhalabe.Tizilombo toyambitsa matenda timafalikira ndi mpweya, madzi othirira, ndi kuwomba kwa mvula, ndi kulowa kudzera mu stomata.Kutentha, chinyezi, mvula, kubzala kowundana, komanso malo amphepo ndi omwe amatha kudwala matendawa.Kusefukira kwa madzi, chinyezi chambiri, kusabereka kosakwanira, kufooka kwa zomera ndi matenda oopsa.Nthawi zambiri, kubzala m'malo otetezedwa ku masika kumakhala ndi matenda ambiri kuposa m'dzinja, ndipo liwiro la mliri limathamanga kwambiri.Chifukwa cha zokolola zambiri zobzala zipatso zolimba, feteleza wokwanira wa organic ndi feteleza wapawiri ayenera kuyikidwa.M'malo mwake, zotayika zobwera chifukwa cha miliri ya matenda chifukwa cha kubala ndi kuwongolera kwakukulu ndizosapeweka., ayenera kulipidwa chidwi kwambiri ndi kupewa msanga.

【Njira yopulumutsira】
Kusamalira zachilengedwe: Kubzala mounjikana moyenerera.Kachulukidwe ka mitundu yoyambilira nthawi zambiri imakhala yaying'ono poyerekeza ndi mitundu yapakhomo, koma zokolola zake zimakhala zapamwamba.Gwiritsani ntchito feteleza wachilengedwe ndi feteleza wa phosphorous ndi potaziyamu moyenera, limbitsani kasamalidwe kamunda, kuchepetsa chinyezi, ndikuwonjezera mpweya wabwino komanso kufalitsa kuwala.Mukalandira katunduyo, chotsani mabwinja omwe ali ndi matenda mwachangu ndikuthira dothi.

Kuwongolera kwa mankhwala: Ndi bwino kugwiritsa ntchito njira zonse zopewera matenda a phwetekere ndi kuwongolera zomwe zalembedwa kuti mupewe.Chifukwa ndizodzidzimutsa komanso zovuta kuzipewa, kutenga 25% Azoxystrobin nthawi 1500 pofuna kupewa kudzakhala ndi zotsatira zabwino kwambiri.