Insecticidal plants as trade opportunities and use by small vegetable producers: an example using essential oils to control Diaphania hyalinata (Lepidoptera: Crambidae) oleh ISABEL M. DA SILVA, JOSÉ E. SERRÃO, MARINALVA M. DOS SANTOS, RICARDO S. DA SILVA, AMÉLIA G. DE CARVALHO, EVALDO M. PIRES, JOSÉ C. ZANUNCIO, MARCUS A. SOARES