Diseases
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.
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.
Cucurbita pepo L. · Field pumpkin
PETOSEED CO
Cucurbita pepo L. · Field pumpkin
Pan American Seed Co. (US)
Cucurbita pepo L. · Field pumpkin
Syngenta Seeds, NL
Cucurbita pepo L. · Field pumpkin
Petoseed, US
Cucurbita pepo L. · Field pumpkin
Tezier SA (FR)
Cucurbita pepo L. · Field pumpkin
Saatzucht Gleisdort, A
Cucurbita pepo L. · Field pumpkin
Syngenta Seeds, NL
Cucurbita pepo L. · Field pumpkin
Ralf Kuijpers
Cucurbita pepo L. · Field pumpkin
SVS HOLLAND BV , NL
Cucurbita pepo L. · Field pumpkin
Paris Harryi
Cucurbita pepo L. · Field pumpkin
Vilmorin, F
Cucurbita pepo L. · Field pumpkin
Syngenta Seeds B.V.
Cucurbita pepo L. · Field pumpkin
Ralf Kuijpers
Cucurbita pepo L. · Field pumpkin
Syngenta Seeds B.V.
Cucurbita pepo L. · Field pumpkin
Syngenta Seeds BV (NL)
Cucurbita pepo L. · Field pumpkin
MoravoSeed, CZ
Cucurbita pepo L. · Field pumpkin
HM.CLAUSE
Cucurbita pepo L. · Field pumpkin
VEGETABLE MONSANTO B.V.
Cucurbita pepo L. · Field pumpkin
W. LEGUTKO PRZEDSIEBIORSTWO HODOWLANO NASIENNE SP.Z.O.O
Cucurbita pepo L. · Field pumpkin
Mazerreeuw Jaap
Cucurbita pepo L. · Field pumpkin
Syngenta, NL
Cucurbita pepo L. · Field pumpkin
SEMILLAS FITO, S.A.
Cucurbita pepo L. · Field pumpkin
SYNGENTA SEEDS B.V.
Cucurbita pepo L. · Field pumpkin
Syngenta Crop Protection AG