Özet:

Broomrape (Orobanche spp.), an obligate plant-parasitic plant, causes high yield and quality loss in important crops such as tomatoes grown in the most of the Mediterranean countries and other countries having Mediterranean climate. A two-year pot study was conducted to develop an economic and an efficient control method against branched broomrape (Orobanche ramosa L.) in 2007 and 2008. Rapeseed (Brassica napus L var. oleifera L.), black radish (Raphanus sativus L. var. niger J.Kern), basil (Ocimum basilicum Nufar), thyme (Thymus vulgaris L.), sage (Salvia officinalis L.), oregano (Origanum onites L.) and lavender (Lavandula officinalis L.) were harvested at the flowering stage and dried under shade. Dried plant parts were powdered and used for 2%, 4%, 6%, 8% and 16% plant extract containing solutions. Tomato seedlings were planted in 2 L pots containing peat artificially infested with 0.50 g of the broomrape seed and each pots treated with extracts at 100 ml/pot concentrations. The shoot number, tubercle number, capsule number and dry weight of broomrape were determined at the tomato harvest. Shoot number, tubercle number and capsule number of broomrape were decreased with the increasing concentrations of each treatment. The lavender extract treatment had the highest reduction rates on the investigated broomrape parameters. The reduction rates of plant parameters were around 50% in both years. When the allelopathic effect on the amount of tubercle and capsule was considered, 60-70% inhibitions were observed with basil extract applications in both years. The allelopathic effects of rapeseed on broomrape dry weight were 50-60% in both years

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