Susceptibility of newly emerged seedlings of Norway spruce [Picea abies (L.) H. Karst.] to selected herbicides was examined under greenhouse conditions. The following active substances were investigated: propaquizafop (50 g/ha), mesotrione (100 g/ha), nicosulfuron (40 g/ha), pendimethalin (990 g/ha), fluroxypyr 125 (g/ha), clopyralid (90 g/ha), iodosulfuron-methyl-sodium (7.5 g/ha), MCPA (562.5 g/ha), clopyralid (100 g/ha) + fluroxypyr (150 g/ha) + triclopyr (200 g/ha), bentazone (1440 g/ha). Only after the application of propaquizafop no damages were observed. A low level of phytotoxicity (needle growth was slightly inhibited) occurred after pendimethalin and clopyralid application. The other herbicides caused major damages of seedlings. Following the visual assessment, the plants were cut and fresh shoot biomass was determined. Only propaquizafop did not affect biomass production, while the other herbicides significantly reduced the fresh biomass of seedlings.
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