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首页> 外文期刊>Weed technology >Downy Brome (Bromus tectorum), Jointed Goatgrass (Aegilops cylindrica) and Horseweed (Conyza canadensis) Control in Fallow
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Downy Brome (Bromus tectorum), Jointed Goatgrass (Aegilops cylindrica) and Horseweed (Conyza canadensis) Control in Fallow

机译：霜霉病（Bromus tectorum），节节性山羊草（Aegilops cylindrica）和马草（Conyza canadensis）的休耕控制

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摘要

Jointed goatgrass, downy brorae, and horseweed are increasingly troublesome winter annual weeds during fallow periods in conservation-tillage systems in the southern Great Plains. These experiments determined the optimum weed size, vigor, and minimum herbicide rate required for 95% or better control of these weeds on fallow land. Jointed goatgrass and downy brome were controlled best when plants were 10 cm or less tall and growing vigorously at time of treatment. Horseweed was controlled best when plants were 30 cm tall and growing vigorously. Based on local retail and application costs and assuming optimum conditions for control, the two most economical herbicide treatments that controlled each weed 95% or better were: jointed goatgrass, clethodim at 250 g ai/ha and glyphosate + 2,4-D at 249 + 479 g ae/ha; downy brome, quizalofop at 18 g ai/ha and glyphosate + 2,4-D at 582 + 950 g ae/ha; and horseweed, 2,4-D at 560 g ae/ha and metsulfuron at 5 g ai/ha.
机译：在大平原南部的保护性耕作系统中，休耕期的山羊草，霜霉病和马杂草在冬季越冬越麻烦。这些实验确定了在休耕地上对这些杂草进行95％或更好控制所需的最佳杂草大小，活力和最小除草剂率。当植物高不到10厘米并在处理时旺盛生长时，节理的山羊草和霜霉病可得到最佳控制。当植物高30厘米且生长旺盛时，对马草的控制效果最佳。根据当地的零售和应用成本，并假设控制最佳的条件，控制每株杂草95％或更好的两种最经济的除草剂处理方法是：联合山羊草，杀虫菊酯的剂量为250 g ai / ha和草甘膦+ 2,4-D的剂量为249 + 479 g ae / ha;霜霉病菌，quizalofop的剂量为18 g ai / ha，草甘膦+ 2,4-D的剂量为582 + 950 g ae / ha；以及马草，560 g ae / ha的2,4-D和5 g ai / ha的甲磺隆。

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