Can phosphorous acid be used to control Neonectria ditissima in New Zealand grown apples?

Q3 Agricultural and Biological Sciences

New Zealand Plant Protection Pub Date : 2019-07-26 DOI:10.30843/NZPP.2019.72.279

Jason T. Smith, M. Walter, R. Campbell, L. Turner

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引用次数: 2

Abstract

European canker, Neonectria ditissima, is a worldwide apple tree disease killing shoots, branches and trees, and treatment with phosphorous acid is a possible control option. The effect of six postharvest phosphorous acid (PA) treatments on fruit residues the following season was studied in Tasman on two trial sites growing ‘Scifresh’ or ‘Scilate’ apple trees. Spray treatments consisted of number (0–3) and timing (early, mid and/or late) of PA applications. Additionally, leaf-scar wounds were artificially inoculated with N. ditissima spores at the ‘Scilate’ site on 1 and 8 June 2017 to determine disease control. Symptom expression was checked regularly between October 2017 and February 2018. None of the treatments caused a statistically significant reduction in the incidence of canker development compared with the control. Two or more PA applications resulted in PA residues in fruit, at harvest, the following season. Higher PA residues were found in fruit following early applications than with late applications. More applications of PA resulted in higher residues. This finding has important implications for exporting fruit to markets that have no tolerance for PA residues.

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磷酸是否可用于控制新西兰产苹果的新蝇?

欧洲溃疡病(Neonectria ditissima)是一种全球性的苹果树病，可杀死苹果的嫩枝、树枝和树，用磷酸治疗是一种可能的控制选择。在塔斯曼的两个试验点上，研究了采后磷酸(PA) 6种处理对下一季果实残留物的影响，这些试验点分别种植“Scifresh”和“sciate”苹果树。喷施处理包括喷施次数(0-3次)和时间(早、中、晚)。此外，于2017年6月1日和8日在“Scilate”地点人工接种了ditissima孢子，以确定疾病控制情况。于2017年10月至2018年2月定期检查症状表达。与对照组相比，没有一种治疗方法在统计上显著降低了溃疡病的发病率。两次或两次以上的PA施用导致果实中PA残留，在收获季节，下一个季节。早期施用后果实中PA残留量高于后期施用。PA用量越大，残留越高。这一发现对于将水果出口到对PA残留没有容忍度的市场具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

New Zealand Plant Protection Agricultural and Biological Sciences-Insect Science

CiteScore

1.10

自引率

0.00%

发文量

期刊介绍： New Zealand Plant Protection is the journal of the New Zealand Plant Protection Society. It publishes original research papers on all aspects of biology, ecology and control of weeds, vertebrate and invertebrate pests, and pathogens and beneficial micro-organisms in agriculture, horticulture, forestry and natural ecosystems of relevance to New Zealand.