Barley grass control in a three year rotation at Esperance

Barley grass is becoming an increasingly problematic weed in Western Australia. A GRDC funded project sought to increase adoption of integrated weed management tactics for barley grass, by working with grower groups to develop regionally appropriate rotations for optimal control. A survey indicated that in southwest Australia, many growers thought their barley grass was resistant to grass selective herbicides and may have developed late germination to avoid pre-seeding herbicides. In this area barley grass was a major problem in pastures, and often in break crops too.A three year trial aimed to investigate pre-emergent herbicides and autumn tickle in wheat in 2019, pre-emergent herbicides and crop density in barley in 2020 and grass selective herbicides and crop topping in pasture in 2021.

大麦草（Barley grass）在西澳大利亚州已逐渐成为愈发棘手的恶性杂草。由GRDC资助的项目旨在通过联合种植者群体开发适配区域的轮作方案，以实现大麦草的最优防控，进而推广综合杂草管理策略。一项调查显示，在澳大利亚西南部地区，多数种植者认为其田块中的大麦草已对禾本科选择性除草剂产生抗药性，且可能进化出延迟萌发的特性以规避苗前除草剂的防控作用。该区域内，大麦草不仅是牧场中的主要杂草问题，在轮作茬口作物田中也常构成严重困扰。本试验为期三年，具体研究内容如下：2019年针对小麦田探究苗前除草剂与秋季浅耕（autumn tickle）的防控效果；2020年针对大麦田开展苗前除草剂与种植密度的相关试验；2021年则针对牧场测试禾本科选择性除草剂与作物封顶施药（crop topping）的应用效果。