Scherf A, Schuster C, Marx P, Gärber U, Konstantinidou-Doltsinis S, Schmitt A
JKI, Institute for Biological Control, Darmstadt, Germany.
Commun Agric Appl Biol Sci. 2010;75(4):541-54.
In organic cucumber production infection with downy mildew (Pseudoperonospora cubensis) is a major problem. Plant extracts from Glycyrrhiza glabra L. (licorice), a plant belonging to the family Fabaceae, and Salvia officinalis (sage) as well as cultures of the bacterium Aneurinibacillus migulanus were investigated for efficacy of disease control under commercial growing conditions. Contrary to bioassays, where sage extract and the microorganism showed highest activity, in the trials of 2008 G. glabra extract was more effective than sage extract or A. migulanus against P. cubensis. Parameters such as concentrations of the preparations or application intervals could have been the reason for this. In the following year's trial (2009) the concentration of these agents was therefore increased somewhat and plants were either treated in seven day application intervals or in ten day application intervals. In the semi-commercial trials of 2009 all alternative biological agents showed good efficacies up to around 80% against infection with downy mildew. The application interval seemed to have a marginal effect only. Again, the licorice extract tended to be the best agent.
在有机黄瓜生产中，感染霜霉病（古巴假霜霉）是一个主要问题。对豆科植物光果甘草（甘草）和鼠尾草的植物提取物以及迁移类芽孢杆菌的培养物在商业种植条件下的病害防治效果进行了研究。与生物测定结果相反，在生物测定中鼠尾草提取物和微生物表现出最高活性，但在2008年的试验中，光果甘草提取物对古巴假霜霉的防治效果比鼠尾草提取物或迁移类芽孢杆菌更有效。制剂浓度或施药间隔等参数可能是造成这种情况的原因。因此，在次年（2009年）的试验中，这些药剂的浓度有所提高，植株分别以7天或10天的施药间隔进行处理。在2009年的半商业试验中，所有替代生物制剂对霜霉病感染的防治效果都很好，高达80%左右。施药间隔似乎只有很小的影响。同样，甘草提取物往往是最好的药剂。
