Assessing alternative strategies to control almond red leaf blotch through the reduction of Polystigma amygdalinum inoculum in leaf litter.

IF 3.8 1区农林科学 Q1 AGRONOMY

Pest Management Science Pub Date : 2025-09-08 DOI:10.1002/ps.70192

Gemma Pons-Solé,Lidia Aparicio-Durán,Jordi Luque,Laura Torguet,Xavier Miarnau

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引用次数: 0

Abstract

BACKGROUND Red leaf blotch (RLB), caused by Polystigma amygdalinum, is a major foliar disease of almond trees in Mediterranean and Middle Eastern regions. While preventive fungicide applications are the main control strategy, cultural practices aimed at reducing pathogen inoculum in leaf litter are gaining relevance. This study evaluated the efficacy of four chemical treatments on fungal biomass and ascospore production in leaf litter and assessed the impact of two cultural practices-urea application and leaf litter removal-on airborne inoculum levels and disease incidence under field conditions. RESULTS Urea and lime sulfur significantly reduced ascospore production by 99% and 94%, respectively, compared to the untreated control. Urea was the only treatment that also significantly reduced fungal biomass. In field trials, leaf litter removal reduced airborne ascospores by 60% but did not significantly affect RLB incidence or severity. Urea application reduced airborne ascospores by 45% and led to a modest yet statistically significant 4% reduction in disease incidence. CONCLUSION This study highlights the potential of cultural practices to reduce the primary inoculum of P. amygdalinum in almond orchards. Urea application offers dual benefits by reducing both fungal biomass and ascospore release, contributing to modest disease suppression. For more effective and sustainable RLB control, these practices should be integrated into a broader management strategy that includes the selection of tolerant almond cultivars, preventive fungicide applications guided by forecasting models. © 2025 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

查看原文本刊更多论文

通过减少凋落叶中苦杏仁多柱头菌的接种量来评估控制杏仁红叶斑病的替代策略。

背景：杏仁多柱头病（Polystigma amygdalinum，简称RLB）是地中海和中东地区杏树的主要叶面病害。虽然预防性杀菌剂应用是主要的控制策略，但旨在减少落叶中病原体接种量的文化实践正在获得相关性。本研究评估了4种化学处理对凋落叶真菌生物量和子囊孢子产量的影响，并评估了两种培养方式——施用尿素和清除凋落叶——对田间条件下空气传播接种水平和病害发病率的影响。结果与未处理的对照相比，硫脲和石灰硫显著降低子囊孢子产量，分别降低了99%和94%。尿素是唯一显著降低真菌生物量的处理。在田间试验中，去除凋落叶可使空气传播的子囊孢子减少60%，但对RLB的发病率或严重程度没有显著影响。施用尿素可使空气传播的子囊孢子减少45%，并使疾病发病率降低4%，虽然幅度不大，但在统计学上具有显著意义。结论本研究强调了在扁桃园采用栽培方法减少苦杏仁初级接种量的潜力。尿素施用通过减少真菌生物量和子囊孢子释放提供双重益处，有助于适度抑制疾病。为了更有效和可持续地控制RLB，这些做法应纳入更广泛的管理战略，包括选择耐受性杏仁品种，在预测模型的指导下预防性使用杀菌剂。©2025作者。由John Wiley & Sons Ltd代表化学工业协会出版的《害虫管理科学》。

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来源期刊

Pest Management Science 农林科学-昆虫学

CiteScore

7.90

自引率

9.80%

发文量

553

审稿时长

4.8 months

期刊介绍： Pest Management Science is the international journal of research and development in crop protection and pest control. Since its launch in 1970, the journal has become the premier forum for papers on the discovery, application, and impact on the environment of products and strategies designed for pest management. Published for SCI by John Wiley & Sons Ltd.