A network meta-analysis of the susceptibility of apple genotypes to powdery mildew under organic management

In the absence of durable host resistance among commercial cultivars, chemical management continues to be an essential component of disease control in apple production. Apple powdery mildew, caused by the ascomycete Podosphaera leucotricha, is largely managed with regular fungicide applications from the host phenological stages of tight cluster to terminal bud growth set, with applications typically being made in a prophylactic manner irrespective of existing disease pressure. Here we evaluated two management programs that aligned fungicide applications to specific weather thresholds conducive to powdery mildew development using a rotation of single-site fungicides and sulfur. In three separate orchards among four cultivars, we compared powdery mildew disease progression over the growing season for each of the weather factor-based programs and a typical calendar-based application program. In each year of the trial, we found that management programs with weather-based fungicide applications provided levels of disease control similar to the calendar program but required 50-83.3% fewer mildew-specific fungicide applications throughout the growing season. Our results provide a framework with which to evaluate future weather-based management programs for apple powdery mildew management. This knowledge could be implemented in the creation of a powdery mildew disease management decision support system to better inform and aid fungicide application programs for continued sustainable apple production in the northeast United States.

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An Examination of Apple Powdery Mildew and the Biology of Podosphaera leucotricha from Past to Present

Strickland

Hodge

Cox

2021

Plant Health Progress

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Within is a comprehensive review of current apple powdery mildew literature, with the taxonomy, morphology, and life cycle of the causal phytopathogen Podosphaera leucotricha described. A discussion of economic impact, environmental aspects contributing to apple powdery mildew epidemiology, options for cultural, chemical, and biopesticide disease control, and fungicide resistance in P. leucotricha is also detailed. The present status of breeding for host resistance and apple cultivar susceptibility are discussed. Finally, emerging research into the biology and management of apple powdery mildew are discussed along with how they may aid future research endeavors.

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A network meta-analysis of the susceptibility of apple genotypes to powdery mildew under organic management

Cited by 6 publications

References 10 publications

Fungicide efficacy trials for the control of powdery mildew (Podosphaera cerasi) on sweet cherry trees (Prunus avium)

Fungicide efficacy trials for the control of powdery mildew (Podosphaera cerasi) on sweet cherry trees (Prunus avium)

Refining Management of Apple Powdery Mildew in New York State with Weather-Based Fungicide Application Timing Programs

An Examination of Apple Powdery Mildew and the Biology of Podosphaera leucotricha from Past to Present

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