Constantly increasing pressure to implement the principles of integrated production of hops results in the need for new plant protection products. Various plant extracts, also called botanicals, have potential to be used as alternatives to conventional pesticides. In three-year field trials on virus-free seedlings of Saaz hops, the efficacy of thyme essential oil, hops extract and algae extract against hops downy mildew (Pseudoperonospora humuli) was investigated. Different concentrations (0.5–1%) of plant extracts were applied to the hop plants six times during vegetative growth, and the degree of damage caused by P. humuli, the health condition and the chlorophyll content in the hops were evaluated after selected applications. All botanicals demonstrated very good antifungal properties comparable to treatment with commercial fungicides. Even one dose of plant extract was able to significantly suppress disease development for two months compared to untreated control. Thyme oil (0.5%) was considered to be the most effective botanical. Not only did it have good antifungal properties, but it also had positive influence on the chlorophyll content (up to 30% increase). These trials have shown that all botanicals tested have the potential to be used in an integrated, ecological hop production system.

实施啤酒花综合生产原则的压力不断增加，导致需要新的植保产品。各种植物提取物，也称为植物提取物，有可能用作传统杀虫剂的替代品。在为期三年的 Saaz 啤酒花脱毒幼苗田间试验中，研究了百里香精油、啤酒花提取物和藻类提取物对啤酒花霜霉病 ( Pseudoperonospora humuli ) 的功效。在营养生长过程中，将不同浓度（0.5-1%）的植物提取物施用于啤酒花植物 6 次，以及P.huuli造成的损害程度，在选择应用后评估啤酒花的健康状况和叶绿素含量。所有植物药都表现出非常好的抗真菌特性，可与商业杀菌剂处理相媲美。与未经处理的对照相比，即使是一剂植物提取物也能够显着抑制疾病发展两个月。百里香油（0.5%）被认为是最有效的植物。它不仅具有良好的抗真菌特性，而且对叶绿素含量也有积极影响（最多增加 30%）。这些试验表明，所有经过测试的植物药都有可能用于综合的生态啤酒花生产系统。