Heremans B, Demeulenaere S, Haesaert G
Hogeschool Gent, Department of Biotechnology, Agriculture and Landscape Architecture Diepestraat 1, BE-9820 Merelbeke, Belgium.
Commun Agric Appl Biol Sci. 2005;70(3):181-4.
Fusarium wilts, caused by the fungus Fusarium oxysporum, are important diseases of horticultural and agricultural crops and lead to significant yield losses. The pathogen infects the roots and colonizes the vascular tissue, leading to wilting and finally death of the plant. The objective of this study was to investigate the efficacy of amendment of green compost and a Trichoderma hamatum strain against Fusarium wilt of radish. The substrate effects and the effect of a Trichoderma strain were tested in a potting soil bioassay. The tested composts lowered the disease level and had a positive influence on the plant yield (fresh weight and dry weight). Nothwithstanding, only a small dosis effect of the amendment was observed. In the presence of the tested Trichoderma hamatum strain no significant lower disease level was observed. Furthermore, a minor effect on plant yield (fresh weight and dry weight) was observed compared to the amendment with only green compost. Maybe the pathogenic Fusarium oxysporum strain and the Trichoderma strain competed for nutrients, iron could be a limiting factor. One possible approach to improve biological control may be the application of combinations of biocontrol agents.
由尖孢镰刀菌引起的枯萎病是园艺作物和农作物的重要病害，会导致严重的产量损失。该病原菌感染根部并在维管组织中定殖，导致植物枯萎并最终死亡。本研究的目的是调查添加绿色堆肥和哈茨木霉菌株对萝卜枯萎病的防治效果。在盆栽土壤生物测定中测试了基质效应和木霉菌株的效果。所测试的堆肥降低了病害水平，并对植物产量（鲜重和干重）产生了积极影响。尽管如此，仅观察到添加物的小剂量效应。在存在测试的哈茨木霉菌株的情况下，未观察到病害水平显著降低。此外，与仅添加绿色堆肥相比，观察到对植物产量（鲜重和干重）的影响较小。也许致病的尖孢镰刀菌菌株和木霉菌株竞争养分，铁可能是一个限制因素。改善生物防治的一种可能方法是应用生物防治剂组合。
