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Diseases

Powdery mildew of zucchini

Cucurbita pepo L.

A fungal disease of zucchini caused by obligate biotrophic fungi Podosphaera xanthii and Golovinomyces cichoracearum. It manifests as a white powdery coating on the upper leaf surface, which eventually spreads to all above-ground plant organs.

In the reference 333 varieties crop Field pumpkin, where this is mentioned in the description.

The pathogens Podosphaera xanthii and Golovinomyces cichoracearum can develop either individually or together, forming a mixed infection. Symptoms of the disease begin to appear on the upper surface of the leaves as localized light spots that gradually enlarge, coalesce, and transform into a dense “felty” coating, spreading to petioles and stems. Under conditions of severe infection, plant tissues become chlorotic, toughen, and die.

The development of the pathogens is favored by moderate temperatures in the range of 18–25°C, high air humidity, and dense planting that limits ventilation. Genetic resistance of the crop to the disease is most often polygenic and classified as intermediate. In zucchini breeding, the PMR label is used to indicate the ability of plants to suppress infection development, although specific alphanumeric gene designations are rarely encountered in general practice.

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

Sources8

Varieties of Field pumpkin 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.

Black Beauty

Active

Cucurbita pepo L. · Field pumpkin

BG CZ ES FR IT UA
8 records

Negron

Terminated

Cucurbita pepo L. · Field pumpkin

CZ NL
4 records

Jetta

Active

Cucurbita pepo L. · Field pumpkin

Vilmorin SA (FR)

FR
3 records

Anissa

Active

Cucurbita pepo L. · Field pumpkin

VILMORIN, S.A.

ES FR
4 records

Serse

Application submitted

Cucurbita pepo L. · Field pumpkin

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

NL
4 records

Brice

Active

Cucurbita pepo L. · Field pumpkin

Syngenta Seeds B.V.

NL
3 records

Aretusa

Application submitted

Cucurbita pepo L. · Field pumpkin

ENZA ZADEN

NL
4 records

Scudo

Active

Cucurbita pepo L. · Field pumpkin

Syngenta Seeds B.V.

NL
5 records

Rhodos

Active

Cucurbita pepo L. · Field pumpkin

Syngenta Seeds B.V.

NL
3 records

Quios

Active

Cucurbita pepo L. · Field pumpkin

Syngenta UK Ltd

NL
3 records

Flynn

Active

Cucurbita pepo L. · Field pumpkin

SAKATA SEED AMERICA INC US

FR
3 records

Raila

Active

Cucurbita pepo L. · Field pumpkin

LA SEMIORTO SEMENTI SRL

HU IT
3 records

Gold Medal

Active

Cucurbita pepo L. · Field pumpkin

RUPP SEEDS INC

DE
4 records

Syros

Active

Cucurbita pepo L. · Field pumpkin

Syngenta Seeds B.V.

NL
3 records

Zelia

Active

Cucurbita pepo L. · Field pumpkin

Enza Zaden Beheer B.V.

NL
6 records

Géode

Active

Cucurbita pepo L. · Field pumpkin

Graines Gautier SA (FR)

FR
4 records

Sebring

Active

Cucurbita pepo L. · Field pumpkin

Qi Zhang

FR UA
4 records

Milos

Active

Cucurbita pepo L. · Field pumpkin

Syngenta Seeds B.V.

NL
4 records

Mostra

Active

Cucurbita pepo L. · Field pumpkin

Tezier SA (FR)

FR
3 records

Sungroom

Terminated

Cucurbita pepo L. · Field pumpkin

Khuan Tsastro

NL UA
4 records

Safari

Active

Cucurbita pepo L. · Field pumpkin

TOZER SEEDS LTD

NL
3 records

Złoty Cepelin

Active

Cucurbita pepo L. · Field pumpkin

Przedsiebiorstwo Nasiennictwa Ogrodniczego i Szkolkarstwa w Ozarowie Mazowieckim Spolka z o.o.

CZ PL
3 records

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