Eficiência de fungicidas no controle da brusone em trigo
Eficiência de fungicidas no controle da brusone em trigo
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不控制杀菌剂的杀菌效率
DOI：
10.1590/0100-5405/1937
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发表时间：
2014
影响因子：
--
通讯作者：
Moacil Alves de Souza
中科院分区：
文献类型：
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作者：
J. Rocha;Adérico Júnior Badaró Pimentel;Guilherme Ribeiro;Moacil Alves de Souza
由稻瘟病菌引起的小麦稻瘟病是巴西中部小麦生产扩大的主要障碍之一。本研究的目的是评价杀菌剂对小麦稻瘟病的防治效果。3种不同有效成分的杀菌剂与4种小麦品种配伍使用。商业产品的两次应用是在Zadoks等人的量表第45和65阶段进行的。在58-60期人工接种稻瘟病菌孢子。测定了病情发展曲线下面积(AUDPC)、旗叶严重度(SEVFL)和穗严重度(SEVEsp)，并对产量(GY)进行了量化。实验结束后，对不同的分析参数进行皮尔逊相关分析。在VI 03061、VI 07505和BRS254中，杀菌剂环氧康唑+吡虫菊酯和戊唑醇+三氟菌酯的AUDPC最低。在有杀菌剂存在的情况下，SEVFL在不同的基因型之间没有差异。在无杀菌剂条件下，VI 98053和VI 07505的SEVFL最低。戊唑醇+甲氰菊酯具有较高的GY和较低的SEVESP。穗上的病情严重程度比旗叶上严重。用杀菌剂防治小麦稻瘟病，对旗叶有效，对穗部无效。
Wheat blast, caused by the fungus Pyricularia grisea, constitutes one of the major obstacles to the expansion of wheat production in Central Brazil. The aim of this study was to evaluate the efficiency of fungicides in the control of wheat blast. Three fungicides with different active ingredients and combined with four wheat genotypes were used. Two applications of the commercial product were performed in stages 45 and 65 of the scale of Zadoks et al. Artificial inoculation with P. grisea spores was done in stages 58-60 of the above-mentioned scale. The area under the disease progress curve (AUDPC), the severity on flag leaves (SEVFL) and the severity on spikes (SEVEsp) were determined, and grain yield (GY) was quantified. At the end of the experiment, different analyzed parameters were subjected to Pearson's correlation analysis. The fungicides epoxiconazole+pyraclostrobin and tebuconazole+trifloxystrobin provided the lowest AUDPC for the genotypes VI 03061, VI 07505 and BRS 254. There was no difference for SEVFL among genotypes in the presence of fungicides. The genotypes VI 98053 and VI 07505 showed the lowest SEVFL in the absence of fungicide. Tebuconazole+trifloxystrobin provided higher GY and lower SEVEsp. The disease severity on the ears was greater than on flag leaves. Control of wheat blast by means of fungicide application was effective for flag leaves but not for ears.