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首页> 外文期刊>Journal of Arboriculture >Effects of dicamba herbicide on Tubercularia ulmea canker development
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Effects of dicamba herbicide on Tubercularia ulmea canker development

机译:麦草畏除草剂对尺Tube结核病发展的影响

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摘要

Dicamba (3,6-dichloro-o-anisic acid) herbicide was applied to the roots of potted Siberian elm (Ulmus pumila) and Russian-olive (Elaeagnus angustifolia) trees in a greenhouse. Five herbicide concentrations were used: equivalent to rates of 0 (0), 93(1/12), 140 (1/8), 280 (1/4), and 1,121 (1) g/ha (lb/ac) active ingredient. Two weeks after herbicide application, each tree was inoculated with a single isolate of the canker-causing fungus Tubercularia ulmea. The experiment was repeated using two different T. ulmea isolates. Leaf cupping, a symptom of dicamba exposure, was evident two to three weeks after herbicide application. Symptoms occurred at rates of 140 g/ha (1/8 lb/ac) and above in the Siberian elms and the 1,121 g/ha (1 lb/ac) rate in the Russian-olives. All four T. ulmea isolates caused cankers, with canker size differences between fungal isolates and between tree species. None of the herbicide treatments increased or decreased T. ulmea canker size.
机译:将Dicamba(3,6-二氯邻茴香酸)除草剂施用到温室中盆栽的西伯利亚榆树(榆树)和俄罗斯橄榄树(Elaeagnus angustifolia)的根上。使用了五种除草剂浓度:相当于0(0),93(1/12),140(1/8),280(1/4)和1,121(1)g / ha(lb / ac)活性物质的比率成分。在施用除草剂两周后,每棵树都接种了一个单独的致病真菌杜氏结核菌。使用两种不同的尺T分离株重复该实验。叶拔罐是麦草畏暴露的症状,在施用除草剂两到三周后很明显。在西伯利亚榆树中,症状以140 g / ha(1/8 lb / ac)及以上的速率发生,在俄罗斯橄榄树中以1,121 g / ha(1 lb / ac)的速率发生。所有四个T. ulmea分离株均引起溃疡,真菌分离株之间和树木之间的溃疡大小不同。除草剂处理均未增加或减少尺T。

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