Ambrosia artemsiifolia L., grass plant that is multiplied by seeds, invasive, planted annually, of late germination, which can reach heights up to 2 m, varies depending on the soil characteristics. It is spoted as present in Romania since 1908-1910. It is an invasive plant included in the Official List of Quarantine Weed. Their presense causes great losses in crop production. At Potatoes 30%, at beet 70% and at sunflowers we observe the fact that at a high level of infestation between 23.6 to 62.4 plants/m² determine losses included between 650-1680 Kg. Thework presents the method of chemical control of this species. Experiences based on the chemical control of the species Ambrosia artemisiifolia L. were made entirely on land belonging to Teaching and Experimental Station of Timisoara, operating legally under the patronage of the University of Agricultural Sciences and Veterinary Medicine of Banat. The experience field was done after the randomized blocks method, with four variants in three repetiotions. The treatments were applied in 3 feno phases of corn growth as follows: 13 – 14 BBCH, 15 – 16 BBCH and 18 – 20 BBCH, feno phases that cover well the periods of growth and development of corn plants. To combat Ambrosii following herbicides were used: Meister - conţeins 300 g/kg foramsulfuron + 10 g/kg iodosulfuron – methyl-sodium + 300 g/kg iodosulfuron-diethyl (safener); Laudis – conteins embotrione 44 g/l + isoxadifen-etil (safener) 22 g/l; Gardobuc – conteins 333 gl/l terbuthylazin +150 g/l Bromoxinil Heptonoat 214,7 g/l; Buctril Universal – conteins bromoxinil 280 g/l + acid 2,4-D (ester) 280 g/l. The four tested herbicides on corn crops have had a different efficiency in controlling Ambrosia artemisiifolia L; the Gardbouc and Buctril Universal herbicides being similar in efficiency and also superior to Laudis and Meister herbicides.

common ragweed, Ambrosia artemisiifolia,invasive; Romania; chemical control; loss of production

Presentation: oral