Control of barley grass in a pasture-barley-oats rotation

Barley grass is becoming an increasingly problematic weed in Western Australia. A GRDC funded project sought to increase the 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 growers in the southern lakes region of Western Australia often had pasture as the main rotation choice after cereal. In contrast to other areas of the wheat belt, some growers in this region considered barley grass a valuable (early) feed in pasture as well as a weed in crops. However, growers found that barley grass could have a large impact on crop yield. Growers were interested in either controlling barley grass or suppressing barley grass in crops while allowing it to survive in pasture.Most group members felt their barley grass was resistant to herbicides (especially low-level resistance to Group A, Targa®). However, growers were unwilling to stop using Targa®, even if efficiency was reduced against barley grass, as it effectively controlled other grass weeds. Growers wanted to pair Targa® with other products in the pasture to kill barley grass, and then control surviving barley grass in crop with best practice pre-seeding herbicides.The trial aimed to investigate pasture barley grass control in 2019, pre-emergent herbicides in barley in 2020 and oats in 2021.

在西澳大利亚州，大麦草（Barley grass）正逐渐成为一种愈发棘手的杂草。由GRDC资助的一项研究项目旨在通过与种植者团体合作，制定适配区域的轮作方案以实现大麦草的最优防控，从而提升大麦草综合杂草管理策略的推广普及率。一项调研显示，西澳大利亚州南部湖区的种植者通常在谷物种植后选择将牧场作为主要轮作模式。与小麦带其他区域不同，该区域的部分种植者认为，大麦草既可作为牧场中具有价值的（早期）饲草，也会成为大田作物中的杂草。但种植者们发现，大麦草会对作物产量造成显著负面影响。种植者们希望要么实现大麦草的全面防控，要么在大田作物中抑制其生长，同时允许其在牧场中留存。多数参与团体的成员表示，他们地块中的大麦草已对除草剂产生抗药性（尤其是对A类除草剂、塔加®（Targa®）存在低水平抗药性）。但即便该药剂对大麦草的防效有所下降，种植者仍不愿停用塔加®，因其可有效防控其他禾本科杂草。种植者们希望在牧场中将塔加®与其他药剂复配以灭杀大麦草，随后在大田种植阶段采用最优播前除草剂防控存活下来的大麦草。本试验旨在分别于2019年开展牧场大麦草防控研究、2020年开展大麦田播前除草剂研究、2021年开展燕麦田播前除草剂研究。