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This study was targeted to investigate the allelopathic effects of various weeds extracts on seed germination. “Biochemical inhibition” theory was confirmed in 1937 by Molisch, who introduced the scientific term of „allelopathy”. The word “allelopathy” is derived from two separate words. These are allelon meaning “one another”, and pathos meaning “to suffer”. Allelopathy refers to the inhibition of a species to another by using chemicals. Weed seed germination inhibition and growth suppression which can be attributed to allelopathy is highly important and can be considered as a possible alternative, non-chemical weed management strategy (Macias 1995, Asghari and Tewari 2007). Beside crops, weed species with high inhibitory effect also have the potential to be used in control of other weeds (Qasem and Foy 2001, Galzina et al. 2011). Inhibitory” substances are released into the environment where it affects the development and growth of surrounding plants (Ferguson et al. 2013). Active secretions are produced by live organs of the plant, and the passive, come from the dead organs in the course of decomposition (Chirilă 2001). Allelopathy is a naturally occurring phenomenon which refers to any direct or indirect effect, positive or negative of a plant to the other by the release of chemical compounds into the environment (Delabays et al. 2004). The structure and mode of action of allelopathic substances are different, due to this fact they can be used for future development of herbicides (Uludag et al. 2005, Weston 2005). The aim of this study was to determine allelopathic effect of water extracts from biomass of Eriochloa villosa (ERIVI), Asclepias syriaca (ASCSY), Fallopia x bohemica (REYBO), Solidago gigantea (SOOGI) on germination (lettuce) in Petri dishes. It was concluded that some of the weed extracts tested in this study could be used as inhibitor while others could be used as stimulator for the crops. In this work the effects of water extract of some invasive plants on germination of cress (Lepidium sativum L.) plant were studied under laboratory conditions.

Allelopathic effect of invasive plants (Eriochloa villosa, Asclepias syriaca, Fallopia x bohemica, Solidago gigantea) on seed germination