Matenda ambiri a nkhanambo amapezeka pakayambika tuber. Mtundu wa chotupacho, chokulirapo, chotuluka m'miyendo, kapena chophulika, mwina chimatsimikiziridwa ndi kulekerera kosiyanasiyana, kuopsa kwa mtundu wa mabakiteriya, nthawi ya matenda, komanso momwe chilengedwe chimakhalira. Kukula ndi kuopsa kwa nkhanambo zimasiyanasiyana chaka ndi chaka komanso kumunda ndi kumunda.
Zotupa zimakhala zazikulu ndi mawonekedwe osiyanasiyana, kuyambira pang'ono ndi kumwazikana mpaka kubisala pamwamba. Mitundu yosiyanasiyana ya zilonda za nkhanambo ndi monga nkhanambo kapena nkhanambo, nkhanambo, nkhanambo, nkhanambo. Ngati ma tubers akumbidwa nthaka yanyowa, pamakhala zilonda za nkhanambo.
Mabakiteriya a nkhanambo ndi anthu ambiri okhala m'nthaka omwe amatha kukhala ndi moyo kwa nthawi yayitali, ngakhale kulibe mbatata. Amapanga poizoni wotchedwa thaxtomin, zomwe zimapangitsa kuti ziwonongeke pa tubers. Bakiteriya amalowa m'machubu omwe angopanga kumene kudzera mu mphodza zosakhwima, ndipo ma tubers akamakula, zotupa zimakula, ndipo nkhanambo imakula.
Kubzala mbewu za nkhanambo kapena kufalitsa manyowa a ng'ombe omwe ali ndi kachilombo kungapangitse mabakiteriya kuminda yopanda nkhanambo. Machubu omwe amawoneka athanzi amatha kunyamula mabakiteriya pakhungu lawo. Dothi pH kuchokera pa 5.5 mpaka 7.5 ndi yabwino pakukula kwa nkhanambo, pomwe mitundu ya nkhanambo yolekerera asidi (S. acidiscabies) imatha kupatsira ma tubers mu dothi la pH lotsika mpaka 5. Nthaka yofunda, youma imakonda kukula kwa nkhanambo.
Kuwongolera ndi kuwongolera matenda a nkhanambo:
- Bzalani njere zopanda nkhanambo ndi kutaya mbeu zomwe zili ndi kachilombo kuti tizilombo toyambitsa matenda tisalowe mu dothi labwino.
- Kulima mitundu yodziletsa yokha m'minda yomwe ili ndi nkhanambo ndiyo njira yodalirika yochepetsera.
- Kusunga chinyontho cha dothi pamlingo wa 80% wa kumunda kwa masabata atatu kuyambira pomwe tuber imayambika mpaka ma tubers atakula ngati mpira wa gofu kungathandize kuchepetsa kuopsa kwa nkhanambo.
- Zovala zam'mbali ndi ammonium sulphate zanenedwa kuti zimachepetsa kuopsa kwa nkhanambo.
- Pewani kugwiritsa ntchito manyowa a ziweto zomwe zadya machubu omwe ali ndi nkhanambo, komanso tetezani kusuntha kwa dothi pazida zaulimi kuti lisadetsedwe kupita kuminda yathanzi.