high severity

Amabara y'Umuhengeri y'IgitunguruIdentification & Treatment Guide 2026

Alternaria porri · Family: Pleosporaceae

Amabara y'umuhengeri y'igitunguru aterwa na Alternaria. Tera imiti mu gihe kibereye.

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Quick Diagnosis

high

Amabara y'Umuhengeri y'Igitunguru

Affects: leavesseed stalksbulbs
Peak Season: Warm humid weather (25-30°C), rainy season; heavy dew periods
Spread Risk: Moderate
Spread By: Airborne conidia, rain splash, infected crop debris

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Symptoms: What does Amabara y'Umuhengeri y'Igitunguru look like?

Visual identification guide — tap each stage for details

Small purplish spots developing on onion leaf from purple blotch — Small purplish-brown spots on older leaf tissue

Zonate concentric purple-brown lesions on onion leaf — Characteristic concentric (zonate) purple-brown lesion with yellow halo

Onion foliage collapse from severe purple blotch infection — Extensive foliage collapse from girdling lesions — reduced bulb fill

Intambwe ya mbere

Small white sunken spots that turn purple
Udutoni duto tw'amazi ku mababi.

Intambwe yo hagati

Zonate purplish-brown elliptical lesions
Amabara manini y'umuhengeri n'impeta z'umukara.

Intambwe y'imperuka

Leaf girdling and foliage collapse
Amababi yose yumye, igitunguru kigufi.

Causes: Why is my plant getting Amabara y'Umuhengeri y'Igitunguru?

Environmental triggers and disease cycle

Warm temperatures (25-30°C) with high humidity
Extended dew periods (>12 hours) or overhead irrigation
Thrips damage creating wounds for fungal entry
Dense planting reducing air circulation
Previous onion crop debris harboring fungal inoculum

Disease Lifecycle

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Host Plant

Susceptible crop

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Pathogen

Alternaria

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Conditions

Warm humid weather (25-30°C), rainy season; heavy dew periods

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Infection

Penetrates tissue

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Symptoms

Visible signs

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Spread

Airborne conidia

Often confused with: Kubora kw'Umukara kw'Amashu. See our comparison guide.

How to Treat Amabara y'Umuhengeri y'Igitunguru

Tick each step as you complete it — works offline too

🌿 OrganicSafe for all farms

Organic Treatment Steps

5 steps

Tera mu mwanya ubereye kugira ngo umuyaga ushyire.
Hindura ibihingwa imyaka 3.
Koresha copper fungicides.
Kuraho ibisigara by'ibihingwa.
Uhire mu gihe cy'igitondo kugira ngo amababi yume.

🧪 ChemicalUse protective equipment

Chemical Treatment Steps

4 steps

Tera mancozeb buri byumweru 2.
Koresha iprodione cyangwa chlorothalonil.
Tangira ku bimenyetso bya mbere.
Hindura imiti kugira ngo wirinde resistance.

Prevention & Seasonal Calendar

Year-round protection plan for your crops

Pre-Planting

Guhindura ibihingwa
Gutera mu mwanya

Mid-Season

Kuraho ibisigara
Kuhira mu gitondo

Post-Harvest

Tera imiti

🛡️ Resistant Varieties

No highly resistant commercial varieties — all onions are susceptibleRed varieties tend to have slightly more tolerance than white/yellow types

View full seasonal calendar for your region →

Frequently Asked Questions

Common questions about Amabara y'Umuhengeri y'Igitunguru

Ni iki gituma amabara ari umuhengeri?

Ibara ry'umuhengeri riterwa na toxin ya fungi. Impeta z'umukara ni spore zones.

Thrips zifasha indwara?

Yego. Thrips zikora inkovu ku mababi zigafasha fungi kwinjira.

Igitunguru cy'umutuku n'icy'umweru bitandukanye?

Igitunguru cy'umutuku burwanya buhagije. Icy'umweru kikunda kwandura cyane.

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Related Disease

Kubora kw'Umukara kw'Amashu

Xanthomonas campestris pv. campestris

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Affected Plant

Onion

Allium cepa

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Treatment Guide

Full Treatment Protocol

Detailed spray schedule & dosage guide

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