Toxicity of organic farming compatible products to the coffee leaf miner
Madelaine Venzon; Rodrigo Ferreira Krüger; Alberto Soto; Edmar de Souza Tuelher; Italo Santos Bonomo; Marcos Antonio Matiello Fadini; Maira Christina Marques Fonseca
Empresa de Pesquisa Agropecuária de Minas Gerais, Vila Gianetti, nº 46, CEP 36570 000 Viçosa, MG, Brazil.
The objective of this work was to evaluate the toxicity of organic farming‑compatible products to the coffee leaf miner Leucoptera coffeella. Lime sulphur, enriched Bordeaux mixture (Viça Café Plus), and the "supermagro" biofertilizer were first tested in laboratory. The most promising product was tested afterwards under field conditions. In laboratory, different concentrations of each product were applied on L. coffeella eggs and on infested coffee‑mined leaves. Only lime sulphur had ovicidal effects at an acceptable concentration (1.6%) for field applications, but no significant effect on larvae mortality was found. Enriched Bordeaux mixture and the "supermagro" biofertilizer had no effect on L. coffeella eggs and larvae. In the field trial, biweekly or monthly sprayings of lime sulphur at different concentrations caused population decrease after 30 days; however, this effect was not significant after 60 or 90 days.
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