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Diseases

Downy mildew of basil

Ocimum basilicum L.

A fungal disease of basil caused by the oomycete Peronospora belbahrii, characterized by the appearance of chlorotic spots on the leaves and the formation of a gray-purple fuzz on their underside.

In the reference 46 varieties crop Basil, where this is mentioned in the description.

The causal agent of the disease is the obligate oomycete Peronospora belbahrii. Primary symptoms appear as chlorotic spots on the upper surface of the leaf blade, while the veins often remain green, creating a characteristic checkered pattern.

On the underside of the leaf, a dense sporulating fuzz of a grayish or purple shade forms in the yellowed areas. As the infection progresses, the spots coalesce, and the affected areas become necrotic, leading to leaf curling and drop.

At present, there is no intraspecific classification of the pathogen into races, and specific resistance genes in basil have not been identified nor have they been assigned international nomenclature. The resistance of breeding lines is assessed as tolerance without a clear association with genetic markers.

General information about the subject — on the page Downy mildew.

Sources8

Varieties of Basil mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.

Balleta

Terminated

Ocimum basilicum L. · Basil

Saatzucht Aschersleben Herrn Dr. Peter Römer

DE
1 record

Aya

Application submitted

Ocimum basilicum L. · Basil

ARNON BRAND

1 record

Magic White

Active

Ocimum basilicum L. · Basil

Irina Weil in Fa. Bruno Nebelung GmbH & Co. KG

DE
1 record

Evi

Withdrawn

Ocimum basilicum L. · Basil

Enza Zaden Beheer B.V.

1 record

Basilio

Active

Ocimum basilicum L. · Basil

GENESIS SEED LTD

IT
1 record

Lihi

Application submitted

Ocimum basilicum L. · Basil

ARNON BRAND

1 record

Loki

Active

Ocimum basilicum L. · Basil

Nunhems Germany GmbH

1 record

Italiko

Active

Ocimum basilicum L. · Basil

LA SEMIORTO SEMENTI SRL

IT
1 record

Deep Purple

Withdrawn

Ocimum basilicum L. · Basil

A L TOZER LTD

1 record

Mia

Application submitted

Ocimum basilicum L. · Basil

ARNON BRAND

1 record

Emma

Withdrawn

Ocimum basilicum L. · Basil

Enza Zaden Beheer B.V.

1 record

Gentile

Active

Ocimum basilicum L. · Basil

Società Agricola Italiana Sementi (SAIS) S.p.A.

1 record

Giulietta

Withdrawn

Ocimum basilicum L. · Basil

Enza Zaden Beheer B.V.

1 record

Eleonora

Withdrawn

Ocimum basilicum L. · Basil

Enza Zaden Beheer B.V.

2 records

Gervaso

Active

Ocimum basilicum L. · Basil

GENESIS SEED LTD

IT
1 record

Gentleman

Application submitted

Ocimum basilicum L. · Basil

Società Agricola Italiana Sementi (SAIS) S.p.A.

1 record

Piamia

Withdrawn

Ocimum basilicum L. · Basil

Enza Zaden Beheer B.V.

1 record

Noga

Application submitted

Ocimum basilicum L. · Basil

ARNON BRAND

1 record

Genny

Active

Ocimum basilicum L. · Basil

Società Agricola Italiana Sementi (SAIS) S.p.A.

1 record