Cool moist weather conditions are favourable for the development of rust disease (Puccinia helianthi), wilt disease (Sclerotinia spp.), and head rots (Septoria spp., Fusarium spp., Diplodia spp.) On the other hand, very hot dry conditions are favourable for the development of charcoal rot disease (Macrophomina phaseoli)
Nyengo yozizira yachinyezi ndiyabwino ku matenda a dzimbiri (Puccinia helianthi) matenda ofota masamba (Sclerotinia spp.) ndi matenda owola mitu (Septoria spp., Fusarium spp., Diplodia spp.). Kumbali ina, nyengo yotentha imathandizira matenda amakala owoletsa mbewu (Macrophomia Phaseoli)