Performance of prothioconazole solo or added to mancozeb in the control of Asian soybean rust

Summa Phytopathologica Pub Date : 2020-12-01 DOI:10.1590/0100-5405/190162

E. M. Reis, M. Zanatta, A. C. Reis

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引用次数: 2

Abstract

ABSTRACT The evolution of the reduction in Asian soybean rust (caused by Phakopsora pachyrhizi) control by site-specific fungicides has been reported season after season. In a field experiment, the effect of prothioconazole solo and added to multisite mancozeb was evaluated for rust control. Treatments were evaluated in a factorial design of four prothioconazole doses and three mancozeb doses. In a set of treatments, three applications were performed in one soybean cycle and four applications in another one. The first applications were performed at GS V8, 11 days before rust detection, with 2.56% leaflet incidence, while the other applications were at 12 to 14-day interval. Rust severity was quantified, control was calculated in relation to the unsprayed treatment, and soybean grain yield was estimated as kg/ha. Fifty-one to 61% control was obtained with three sprayings and 68% to 70% control with four sprayings of prothioconazole alone. Over 80% control was obtained with at least 0.3 L/ha prothioconazole + 2.0 kg/ha mancozeb, corresponding to 75 g a.i./ha prothioconazole + 1500 g a.i./ha mancozeb. Reduction in P. pachyrhizi control by the use of the site-specific fungicide alone was confirmed, while the addition of mancozeb can recover the efficacy of the site-specific fungicide.

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原硫康唑单用或加用代森锰锌防治亚洲大豆锈病的效果

摘要/ ABSTRACT摘要:对亚洲大豆锈病(由厚根Phakopsora pachyrhizi引起)采用特定地点的杀菌剂进行防治的演变进行了逐季报道。通过田间试验，评价了原硫康唑单用和添加到多位点代森锰锌中防治锈病的效果。采用四剂原硫康唑和三剂代森锰锌的析因设计对治疗进行评价。在一组处理中，一个大豆周期施用3次，另一个大豆周期施用4次。第一次施用于GS V8，在锈病检测前11天，小叶发生率为2.56%，而其他施用间隔为12 ~ 14天。对锈病严重程度进行量化，计算与未喷施处理相比的防治效果，估计大豆籽粒产量为kg/ha。三次喷施prothioconazole防治效果为51% ~ 61%，四次喷施prothioconazole防治效果为68% ~ 70%。至少0.3 L/公顷的原硫康唑+ 2.0 kg/公顷的代森锰锌，相当于75 g a.i./公顷的原硫康唑+ 1500 g a.i./公顷的代森锰锌，防治效果超过80%。单独使用位点特异性杀菌剂可以减少对厚根菌的控制，而添加代森锰锌可以恢复位点特异性杀菌剂的效果。

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

Summa Phytopathologica Agricultural and Biological Sciences-Plant Science

CiteScore

0.90

自引率

0.00%

发文量

期刊介绍： The Summa Phytopathologica is a publication of the São Paulo State Plant Pathology Association (APF), Botucatu SP. Summa Phytopathologica (SP) is dedicated to publishing technical and scientific articles that describe original research in the area of Plant Pathology that may contribute significantly to its progress. SP accepts papers written in Portuguese, English, or Spanish. Its abbreviated title, Summa Phytopathol., should be used in bibliographies, footnotes and bibliographical references and strips.