Resíduos, degradación y persistencia del fungicida maneb en patatas, en Costa Rica
Residues of the fungicide maneb (manganese-1,2-ethylen-bisdithiocarbamate) were analyzed by the carbondisulfide evolution method in samples of potatoes, potato leaves and soil from a commercial crop located in Llano Grande de Cartago, Costa Rica. The residues were monitored during all the crop until harvesting. The highest amount in the potato tubers was 0.25 ppm. In the soil the maximum amount was 14 ppm and the minimum was 0.8 ppm. The corresponding values in the leaf samples were 492 ppm and 22 ppm respectively. The degradation of maneb in the soil (sandy-loam type) under outdoor condi-tions showed a pseudo-first order kinetics with a half life of 10.6 days. A similar study of the degradation of the pesticide in the potato tubers resulted in a half life of maneb of only 5.2 hours. After photochemical irradiation of maneb suspended in water and in absence of oxygen, carbon disulfide and ethylendiamine were determined as decomposition products. All maneb disappeared within 1 h irradiation. Recovery values for residues of maneb are in the order from 82 to 99%.
| Main Authors: | , |
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| Format: | Artículo biblioteca |
| Language: | Spanish / Castilian |
| Published: |
Instituto Interamericano de Cooperación para la Agricultura (IICA)
1983-01
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| Subjects: | RESIDUOS, DEGRADACION, FUNGICIDAS, MANEB, SOLANUM TUBEROSUM, CONTROL DE ENFERMEDADES, ENFERMEDADES FUNGOSAS, COSTA RICA, RESIDUES, DEGRADATION, FUNGICIDES, DISEASE CONTROL, FUNGAL DISEASES, Sede Central, |
| Online Access: | https://repositorio.catie.ac.cr/handle/11554/11973 |
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