ISHS Acta Horticulturae 231: II International Symposium on Mango
PERSISTENCE OF SYNTHETIC PYRETHROID RESIDUES ON MANGO FRUITS |
| Author: | M.D. Awasthi |
| Abstract:
Four promising insecticides, permethrin, cypermethrin, fenvalerate and deltamethrin, from the group of synthetic pyrethroid reported to be highly effective against pest complex of mango have been screened for the persistence of their residues on fruits at the effective levels of their application. The periodic analysis of residues was done by gas liquid chromatography in order to workout half-life of chemicals for degradation pattern and waiting periods as an index for safety to consumers. Permethrin, cypermethrin and fenvalerate were found to persist for three weeks dissipating their residues at the respective half-life values of 5.67, 5.83 and 5.33 days to require correspondingly 7.27, 3.45 and 11.27 days waiting periods based on their tolerance limits. However, deltamethrin persisted only for one week to dissipate at the half-life of 3.81 days and required no waiting period. None of these insecticides penetrated into the pulp of fruit at any stage after spraying. Therefore, if skin is peeled off, the fruits may be free from any contamination. | |
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