Influence of Conyza spp. stature on control efficiency by auxinic herbicides
DOI:
https://doi.org/10.30612/agrarian.v15i55.14568Keywords:
Chemical management, Growth stage, BuvaAbstract
Conyza spp. is a specie that has presented control difficulties, especially when the plants with greater height and in more advanced growth stage. The study aimed to evaluate the control efficiency of 2,4-D choline and formulated mixture 2,4-D choline and glifosato in Conyza spp. with different heights and growth stage. The factors evaluated were three Conyza spp. heights (1-2; 10-12 and 25-30 cm); two herbicides [2,4-D choline (EC) and 2,4-D choline + glifosato (ED)]; and doses of these herbicides corresponding to 0x, 1/2x, 1x, 2x and 4x the recommended dose. The herbicide ED provided better control compared to the EC in all doses and heights evaluated. The Conyza spp. control must be carried out in the early growth stages, because both herbicides at doses equal to or greater than the registration dose are effective for the control, which does not occur in stature greater than 10 cm or stage 19 leaves.
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Copyright (c) 2022 Juliano Gazola, Renan Ricardo Zandoná, Geovana Facco Barbieri, Theodoro Schneider, Dirceu Agostinetto
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