The Efficiency of Vegetable Oil from Cruciferae on Powdery Mildew from Cucumbers and Influence on Pollen Germination

A. NIKOLOV

Agricultural University, Department of Agroecology, BG-4000 Plovdiv, Bulgaria

Abstract

NIKOLOV, A., 2000. The efficiency of vegetable oil from Cruciferae on powdery mildew from cucumbers and influence on pollen germination. Bulg. J. Agric. Sci., 6: 609-612

Study on the efficacy of new formulated as fungicide vegetable oil (MR) from Cruciferae towards powdery mildews from cucumber, and investigation of influence on cucumber pollen has been carried out under lab and greenhouse conditions from cv Gergana. It was established that for in vitro tests the efficiency of MR oil, applied at rate 0.1-1.5% was between 31% – 100% technical efficiency (TE) with respect to conidia from Sphaerotheca fuliginea. In the greenhouse conditions in 1% the MR oil showed higher activity than standards -dinokap Karatan 35 LS and moisten sulfur Tiovit 80 WP.
Vegetable oil MR in concentrations higher than 1% ceased the germination of pollen tubes, and destroyed pollen cells. Applied at rates 0.75% – 1-% MR oil detained the germination of pollen cells, at rate 0.1% – 0.7% MR not showed negative effect with respect to pollen germination.

Key words: vegetable oil, powdery mildew, cucumbers, pollen germination