Evaluation of Herbicide–Adjuvant Combinations for the Control of Ambrosia artemisiifolia in Sunflower (EXPRESS Hybrid)
Keywords:
Ambrosia artemisiifolia, sunflower, halauxifen-methyl, tribenuron-methyl, adjuvantsAbstract
Ambrosia artemisiifolia L. is an invasive species of agronomic and public health concern, known for its aggressive competition with cultivated crops and high allergenic potential. In this context, the present study aimed to evaluate the efficacy and mode of action of several herbicide–adjuvant combinations in controlling this weed, under the pedoclimatic conditions of Hodoș, Timiș County, Romania, in a tribenuron-methyl-tolerant sunflower hybrid. The following treatment variants were tested: V1 - halauxifen-methyl + tribenuron-methyl (50 g/ha) + Vivolt (0.1% V/V); V2 - halauxifen-methyl + tribenuron-methyl (50 g/ha) + Actirob B (0.5 L/ha); V3 - halauxifen-methyl + tribenuron-methyl (50 g/ha) + Codacide (1 L/ha); V4 - halauxifen-methyl + tribenuron-methyl (50 g/ha), without adjuvant; V5 - halauxifen-methyl (1 L/ha), single registered dose; and V6 - halauxifen-methyl (1 L/ha) + tribenuron-methyl (45 g/ha) + Vivolt (0.1% V/V). These were compared based on their efficacy in controlling Ambrosia artemisiifolia, expressed as a percentage. The results revealed significant differences among the tested variants. V5 demonstrated the highest efficacy (95%), followed by V6. Variants containing Codacide or Vivolt in lower doses of active substances, achieved efficiencies between 80–85%; variants without adjuvant (70–75%) or with less effective adjuvants (Actirob B – 75%) provided reduced control of the target weed. The study underline the importance of using high-quality adjuvants and optimal dosing in increasing the efficacy of herbicide treatments.
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