Ukungu wa Marehemu wa ViaziIdentification & Treatment Guide 2026
Phytophthora infestans · Family: Peronosporaceae
Ukungu wa marehemu wa viazi husababishwa na Phytophthora infestans. Huzalisha viraka vya kahawia vya haraka vyenye sporulesheni nyeupe chini ya majani. Viazi vinapata kuoza kwa kahawia isiyokawaida. Dhibiti kwa aina zinazostahimili, kupiga dawa za kuzuia za mancozeb au metalaxyl, kuharibu mimea iliyoambukizwa, na kuhifadhi viazi vizuri.
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criticalUkungu wa Marehemu wa Viazi
- Affects
- leavesstemstubers
- Peak Season
- Cool wet weather (15-22°C), rainy seasons
- Spread Risk
- Fast
- Spread By
- Airborne sporangia, rain wash from leaves to soil infecting tubers, infected seed tubers
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Symptoms: What does Ukungu wa Marehemu wa Viazi look like?
Visual identification guide — tap each stage for details
Water-soaked spots on leaf tips
Viraka vidogo vya kijani meusi hadi kijivu vyenye maji huonekana kwenye kingo na ncha za majani, hasa baada ya kipindi cha unyevu.
Expanding dark lesions with white mold
Viraka hupanuka haraka na kugeuka kahawia meusi. Ukuaji mweupe wa pamba (sporangia) huonekana kwenye kingo za vidonda chini ya jani asubuhi za unyevu. Mashina huonyesha vidonda vya kahawia meusi.
Canopy collapse and tuber rot
Mimea yote hunyauka na kuanguka, huku mashamba yakiwa na harufu ya kuoza. Viazi vinaonyesha maeneo ya kahawia isiyokawaida chini ya ngozi, na kuoza kunaenea haraka wakati wa kuhifadhi.
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