Pathogen. Bakiteriya yowola ya ring ndi yopatsirana kwambiri. Imazizira kwambiri m'machubu ambewu, koma imatha kukhala ndi moyo kwa zaka ziwiri ngati matope owuma pamipeni yodulira, nkhokwe zosungira, zida zobzala ndi kukolola, matumba a burlap, mapepala ndi pulasitiki. Bakiteriyayo saphedwa ndi kuzizira.
Kukula kwa matenda. Kuwola kwa mphete kumafalikira makamaka kuchokera ku njere zomwe zili ndi kachilombo kupita ku ma tubers athanzi panthawi yodula ndi kubzala. Mipeni yodulira mbewu yoipitsidwa ndi zobzala ndizomwe zimafatsira bwino ma ring ring rot chifukwa mabala atsopano amapereka njira yolowera mabakiteriya mu tuber. Kuwola kwa mphete kumatha kufalikira m'munda pokhudzana mwachindunji ndi zomera zodwala ndi zathanzi. Tizilombo toyambitsa matenda timathanso kunyamulidwa ndi zipangizo zaulimi kapena tizilombo toyambitsa matenda monga Colorado potato beetle, kambukuka wa mbatata kapena nsabwe zamtundu wa green pichesi.
Zizindikiro. Chimodzi mwa zizindikiro za matendawa ndi chakuti zizindikiro za foliar ndi mtundu wa zizindikiro zimasiyana malinga ndi mitundu. Mu nyengo yotentha, youma, mphete zowola zimakula mwachangu. Zizindikiro zoyamba m'munda nthawi zambiri zimawonekera pamasamba apansi chapakati pa nyengo.
Njira zoletsa kulekerera ziro zilipo polimbana ndi matendawa. Malamulo a mbatata ku Canada akuwonetsa kuti akapeza mphete ya bakiteriya yowola, malo onse omwe amalimidwa ndi wolima amakanidwa kuti apatsidwe satifiketi.
