Abstract
Plant extracts have shown potential for alternative control of plant diseases. However there are few informations about its viability. The aim of this work was to do a case study of the control of tomato early blight by turmeric (Curcuma longa) rhizomes extract (TE) and discuss aspects concern to sustainability. The study was based on experimental data that demonstrated the potential use of TE similar than chemicals pesticides. The cost of turmeric 100 cultivation and TE preparation was analyzed. Results were confronted with commercial products and in tomato farming systems. Six m2 of turmeric cultivation are sufficient to six TE applications in 1000 m2 of tomato growth. The TE total cost was R$ 65.10 for 1000 m2 of tomato cultivation. From this cost more than 70% is labor which made its cost higher that some commercial products. But, the alternative use of the TE must contribute to obtain differentiated vegetal product, without pesticide residues, allowing an increase in its economic value. Thus, the TE obtaining requires more labor but can contribute as an alternative system for sustainability of familar agriculture and the to environment.
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