**Author details**

*Multifunctionality and Impacts of Organic and Conventional Agriculture*

cases of new glyphosate-resistant weeds were reported: in Australia, the species *Avena sterilis* ssp. *ludoviciana*; in Argentina, the species *Carduus acanthoides* which presented multiple resistance to 2,4-D and glyphosate; in Colombia, the species *Chloris radiata* which showed simple resistance to glyphosate; and also in Argentina, resistance of the species *Echinochloa crus-galli* var. *crus-galli* which was

Among the pesticides, glyphosate is widely used in Brazil and in the world to control weeds in various crops. However, its use should be performed consciously, since there is no significant increase in the amount of weeds resistant to this herbicide. Despite its great use in the country, it presents few reports of resistant weeds than another mode of action of herbicides, such as acetolactate synthase and

Knowledge of glyphosate characteristics, weed biology, resistance mechanisms, and the production system used that favors the emergence of herbicide-resistant weed biotypes is important to appropriately manage and prevent or delay new cases

Crops with glyphosate-resistant transgenic technologies will continue to be important in the future for weed management, and resistant biotypes will continue to be selected. Thus, good agricultural practices are indispensable, and more innovations in technologies are necessary for the future. Therefore, adopting a long-term weed management perspective and integration system for all agricultural

**14**

reported [10].

**Figure 12.**

**6. Conclusions**

photosystem II (PSII) inhibitors.

*Glyphosate-resistant weeds worldwide. Source: Heap [10].*

of resistant weeds in the field.

practices is of paramount importance to farmers.

Kassio Ferreira Mendes1 \*, Rodrigo Nogueira de Sousa2 and Ana Flávia Souza Laube3

1 Department of Agronomy, Federal University of Viçosa, Viçosa, MG, Brazil

2 Department of Soil Science, "Luiz de Queiroz" College of Agriculture, University of São Paulo, Piracicaba, SP, Brazil

3 Department of Chemistry, Federal University of Viçosa, Viçosa, MG, Brazil

\*Address all correspondence to: kfmendes@ufv.br

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