Botanical Products against Powdery Mildew on Cucumber in Greenhouses

Abstract

During the period 2013-2014, studies for establishment of effective alternative means for control of powdery mildew (Podosphaera xanthii U. Braun & N. Snish. Comb. Nov. Syn. Sphaerotheca fuliginea) on cucumbers grown in greenhouses were conducted. Plant oils of white mustard (Brassica alba L.), hemp (Cannabis sativa L.) and wild yarrow (Ahillea millefolium L.) were tested in two concentrations 0.5% and 1.0%. The phytopesticides HF 250 ml/da (extract from dill (Anethum graveolens L.) and AlgoVital Plus 0.3% (extract of brown seaweed Ascophyllum nodosum (L.) Le Jolis) were also included in this study. The effect of botanical products is compared with a standards Bayfidan 250 EC 0.02% (a.i. triadimenol) and Domark (a.i. tetraconasol 40 g/L) 0.05%. It was established a high efficacy of the studied products compared to that of the standard. Biological activity of Biofa is less expressed. Studied products are suitable for including in organic and integrated systems for control of powdery mildew in cucumber