Evaluation of Biological Activity of Plant Oils and Soaps, towards to Sphaerotheca Fuliginea

D. GANCHEV and A. NIKOLOV
Agricultural University, Department of Agroecology, BG - 4000 Plovdiv, Bulgaria

Abstract

GANCHEV, D. and A. NIKOLOV, 2006. Evaluation of biological activity of plant oils and soaps, towards to Sphaerotheca fuliginea. Bulg. J. Agric. Sci., 11: 441 -445

In spring and summer of 2003, in Agricultural University in town of Plovdiv, were conducted a trials to control Sphaerotheca fuliginea on cucumber plants growing under greenhouse conditions, with plant oils and soaps. We tested a refined grape - seed oil, emulgated with soybean lethicin, oil and it's soap derived from plants witch are from Brassicaceae family, and treatment with soy-bean lethicin on one's own. A mineral oil applied in Bulgaria as pesticide under target name RZ Maslo was used as standard, and water treatment - as control. The results shown a high curative action of water emulsion of grape-seed oil. The oil and soap from plant from Brassicaceae family had a more strong preventive action, the soybean lethicin - alone treatment - the same action. A tests with grape-seed oil water emulsion was conducted to determine inhibition of fertility of cucumber pollen - they showed decreased germination of pollen die of treatment with grape-seed oil water emulsion, corresponding with doses of application - lower doses - lower inhibition. Another tests with the same oil and with oils and soaps derived from plants from Brassicaceae family were conducted to determine theirs phytotoxic behavior according to cucumber plants.

Key words: plant protection, oil, soap, lethicin, powdery mildew, cucumbers, pollen fertility, phytotoxic