Fodder production and grazing represents an important activity in zootechny, especially for cattle taking into account, that from production expense, thouse for animal food represents the greatest  weight. In majority pasture ecosystems exploited by grazing, it is happening a transformation of flora composition, frequently through adaptation in this surfaces with desirable species with low economic value. The control of invasive plants, known with generic name weeds, comunne in all agroecosystems, require height costs, determinating a major cost of production, correlated with a low work productivities in this economyc sector with major importance. Our preliminary research performed in pastures from central region of Moldavia which were exploited in a non-rational and inadequare mode have showed that some plants with small fodder qualities or which have the capacity to synthesize some toxic substances for animals, has been multiplied very much becoming invasive weeds (Lepidium draba, Euphorbia cyparissias, Artemisia sp., etc), wich decrease dramatically the productivity of the ecosystems. The observations were made in year 2008 in a natural pasture from the department of Iassy, norteast of Romania. This paper presents the observations regarding the biological control agents which can limitate the Lepidium draba populations.

natural pasture; invasive weeds; biological control agents

Presentation: oral