Herbicide tolerance of some varieties of willow (Salix ssp.)

摘要

Field experiments on the reaction of three Salix vinimalis cultivars (Turbo, Kortowska, Start) to herbicides were conducted in 2010-2011. The tested herbicides - Targa Super 05 EC, Fusilade Forte 150 EC, Focus Ultra 100 EC, Pantera 040 EC, Agil 100 ECand Selekt Super 120 EC were applied during the vegetation of season of willow {Salix ssp). All cultivars showed a high level of tolerance to used herbicides except for a lower selectivity to the active substance - clethodym. In both years of investigations the climatic conditions at the time of application influenced the reaction of cultivars to Selekt Super 120 EC. Observations showed the highest phototoxicity (growth retardation, deformation of shoots, necrosis of leaves) to the cultivar Kortowska 28 days after the treatment. The highest symptoms of damage were observed in 2010 and the percentage values were respectively 26.7% - Start, 30.7% - Turbo, and 50.2% - Kortowska. In the second year of investigation used herbicides caused the lower phytotoxity as compared to 2010 (12.4% - Start, 19.6% - Turbo and 17.5% - Kortowska). As a result of the low tolerance of studied cultivars to the active substance -clethodym, a significant decrease in the yield of cultivars of Turbo and Kortowska was recorded.The above relationship was not stated for the cultivar Start.