October 15, 2025Open Access

Performance of disease-resistant grapevine varieties with reduction of fungicide spraying

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The study shows PIWI-resistant grape varieties exhibit lower severity of downy mildew compared to traditional varieties.
Maximum incidence and severity of diseases were evaluated, revealing ‘Helios’ is susceptible to anthracnose while ‘Bronner’ is vulnerable to grape ripe rot.
Assessment utilized diagrammatic scales to estimate disease severity under reduced fungicide application in Brazil.
Results suggest that reducing fungicide application does not negatively impact the performance of resistant varieties.

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This study compares disease resistance of PIWI varieties to conventional grapes, indicating less fungicide use is feasible.

Souza et al. (2025) studied this question.

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