critical severity

Indwara y'Imirongo Miremire y'ImyumbatiIdentification & Treatment Guide 2026

Cassava brown streak virus (CBSV) · Family: Potyviridae

Indwara y'imirongo miremire y'imyumbati iterwa na virusi ikwirakwizwa n'imvu yera. Itera imirongo y'ikigina ku bishami n'ibimenyetso by'ikigina mu mizi. Irwanywa no gukoresha imbuto zisukuye, ubwoko burwanya, no kurwanya imvu yera.

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Quick Diagnosis

critical

Indwara y'Imirongo Miremire y'Imyumbati

Affects: leavesstemstubers
Peak Season: Year-round; tuber necrosis worsens with extended time in the ground (>12 months)
Spread Risk: Moderate
Spread By: Whitefly (Bemisia tabaci), infected stem cuttings

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Symptoms: What does Indwara y'Imirongo Miremire y'Imyumbati look like?

Visual identification guide — tap each stage for details

Feathery yellow chlorotic patches on mature cassava leaf from CBSD — Feathery yellow blotches on mature leaves, characteristic CBSD symptom

Brown streaks on green cassava stem from CBSD — Brown-purple streaks on green stem, diagnostic of CBSD

Cross-section of cassava tuber showing brown necrotic rot from CBSD — Dry brown corky necrosis inside tuber, revealed only at harvest

Intambwe ya mbere

Feathery yellow patches on mature leaves
Amababi agaragaza mozayike yoroheje y'umuhondo cyangwa utusozi tw'ikigina duto. Ku bishami hagaragara imirongo y'ikigina.

Intambwe yo hagati

Brown streaks on green stems
Imirongo y'ikigina ku bishami igaragara neza cyane. Amababi ashobora gutera hasi mbere y'igihe. Igihingwa kikomera gato.

Intambwe y'imperuka

Dry brown necrotic rot in tubers
Imizi (imyumbati) igaragaza utusozi tw'ikigina n'ikirabura imbere (necrosis). Imyumbati ishobora gusa nk'iyandujwe cyane iyo itetse cyangwa ikikijwe.

Causes: Why is my plant getting Indwara y'Imirongo Miremire y'Imyumbati?

Environmental triggers and disease cycle

Planting infected stem cuttings
Whitefly transmission of CBSV/UCBSV
Extended growth period (>12 months) allowing tuber necrosis to worsen
Low altitude and warm coastal environments favoring whitefly vectors

Disease Lifecycle

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Host Plant

Susceptible crop

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Pathogen

Ipomovirus

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Conditions

Year-round; tuber necrosis worsens with extended time in the ground (>12 months)

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Infection

Penetrates tissue

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Symptoms

Visible signs

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Spread

Whitefly (Bemisia tabaci)

Often confused with: Indwara ya Mozayike y'Imyumbati, Indwara y'Ivirusi y'Ikijumba. See our comparison guide.

How to Treat Indwara y'Imirongo Miremire y'Imyumbati

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🌿 OrganicSafe for all farms

Organic Treatment Steps

4 steps

Rambura ibihingwa byanduye maze ubirimbuze. Koresha imbuto zisukuye mu gisimbuza.
Koresha amavuta ya neem kugira ngo urwanye imvu yera.
Gukurikirana imirima buri gihe no gukuraho ibihingwa bigaragaza ibimenyetso.
Tera ibihingwa bitandukanye mu murima kugira ngo ugabanye ikwirakwira.

🧪 ChemicalUse protective equipment

Chemical Treatment Steps

4 steps

Kuvuza imidacloprid mu butaka ku 0.5 ml/L mu gihe cyo gutera kugira ngo wirinde imvu yera.
Kuvuza thiamethoxam (Actara) ku 0.5 g/L amazi kugira ngo urwanye imvu yera.
Kuvuza spiromesifen ku 0.5 ml/L kugira ngo urwanye imvu yera nto n'inkuru.
Hindura imiti buri gihe kugira ngo wirinde resistansi.

Prevention & Seasonal Calendar

Year-round protection plan for your crops

Pre-Planting

Gukoresha imbuto z'imyumbati zisukuye nta virusi
Gutera ubwoko burwanya indwara
Kurwanya imvu yera mu murima

Mid-Season

Gukuraho ibihingwa byanduye vuba
Kutajyana imbuto ziturutse mu turere dufite indwara
Gukurikirana imirima buri gihe

Post-Harvest

Kwigisha abahinzi ba hafi ibimenyetso

🛡️ Resistant Varieties

NASE 19 (Uganda)Kiroba (Tanzania)NAROCASS 2 (Uganda)Mkuranga-1 (Tanzania)

🌼 Companion Planting

These plants can reduce Indwara y'Imirongo Miremire y'Imyumbati pressure when grown nearby:

beanmaizegroundnut

View full seasonal calendar for your region →

Frequently Asked Questions

Common questions about Indwara y'Imirongo Miremire y'Imyumbati

Itandukaniro riri hagati ya mozayike n'imirongo miremire ni irihe?

Mozayike itera cyane ibimenyetso ku mababi (ibara ry'umuhondo n'icyatsi bihuze). Imirongo miremire itera ibimenyetso bikomeye mu mizi (imyumbati) — utusozi tw'ikigina n'ikirabura imbere. Zombi zikwirakwizwa n'imvu yera.

Imyumbati yandujwe n'imirongo miremire irashobora kuribwa?

Imyumbati ifite ibimenyetso byoroheje irashobora kuribwa. Ariko imyumbati ifite utusozi tw'ikirabura bikomeye imbere ntikwiriye kuribwa kuko itameze neza kandi inezeza.

Iyi ndwara iri mu Rwanda?

Yego, indwara y'imirongo miremire y'imyumbati yagaragaye mu Rwanda n'ibihugu bikikiije. RAB itanga imbuto zisukuye n'ubwoko burwanya.

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Related Disease

Indwara ya Mozayike y'Imyumbati

African cassava mosaic virus (ACMV)

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Related Disease

Indwara y'Ivirusi y'Ikijumba

Sweet potato feathery mottle virus (SPFMV) + Sweet potato chlorotic stunt virus (SPCSV)

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Affected Plant

Cassava (Manioc)

Manihot esculenta

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Treatment Guide

Full Treatment Protocol

Detailed spray schedule & dosage guide

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