PCR-RFLP analysis for detecting potential QoI and CAA fungicide resistance in onion and lettuce downy mildews

Article Horticulture

Characteristics of Meteorological Conditions during a Severe Outbreak of Onion Downy Mildew and Metalaxyl Sensitivity of Peronospora destructor in Saga, Japan, in 2016

Shin-ichirou Syobu et al.

Summary: In 2016, a severe outbreak of onion downy mildew occurred in Saga Prefecture, western Japan due to specific meteorological conditions and the emergence of less-metalaxyl-sensitive strains of P. destructor.

HORTICULTURAE (2022)

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Article Plant Sciences

Fungicide Efficacy Against Pseudoperonospora humuli and Point Mutations Linked to Carboxylic Acid Amide Resistance in Michigan

Douglas S. Higgins et al.

Summary: Hop growers in Michigan faced annual downy mildew outbreaks, but fungicides like oxathiapiprolin, ametoctradin/dimethomorph, fluopicolide, cyazofamid, and mandipropamid showed significant control against the disease. The absence of resistant genotypes in Michigan isolates indicates that CAA-containing commercial fungicides can still be used effectively for downy mildew management in the region.

PLANT DISEASE (2021)

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Article Plant Sciences

Real-Time PCR Detection of the Onion Downy Mildew Pathogen Peronospora destructor From Symptomless Onion Seedlings and Soils

Kazuki Fujiwara et al.

Summary: The study shows that P. destructor can be detected in both asymptomatic plants and soil, indicating a potential strategy to optimize disease management for onion downy mildew. The real-time PCR assay using novel primer sets provides a useful tool for identifying and quantifying inoculum sources.

PLANT DISEASE (2021)

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Article Plant Sciences

Identification of Major Quantitative Trait Loci Controlling Field Resistance to Downy Mildew in Cultivated Lettuce (Lactuca sativa)

Lorena Parra et al.

Summary: The study identified a major QTL on chromosome 4 that significantly affects field resistance in both the Grand Rapids x Salinas and Iceberg x PI491224 populations, as well as two additional significant QTLs on chromosomes 2 and 5 in the Iceberg x PI491224 RIL population. By utilizing marker-assisted gene pyramiding of multiple Dm genes along with QTLs for field resistance, there is potential to develop cultivars with more durable resistance to B. lactucae.

PHYTOPATHOLOGY (2021)

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Article Agronomy