Mandestrobin (S-2200) is a novel strobilurin fungicide for control of a variety of fungal pathogens on canola, grape, strawberry and turf. Based on chemical properties and laboratory environmental fate studies, mandestrobin will not volatilize from soil or aqueous solution. Neither photolysis on soil nor hydrolysis is expected to be a significant degradative pathway for the dissipation of mandestrobin. The primary degradative pathway for dissipation of mandestrobin in the soil environment is microbial degradation under aerobic conditions. The formation and decline of significant degradates (including novel amides) will be discussed. Laboratory studies demonstrate that mandestrobin will degrade significantly slower under anaerobic and under flooded conditions. While mandestrobin degrades readily under aqueous photolysis conditions, its use pattern will limit the significance of this route of dissipation. Mandestrobin is unlikely to leach in soil but its moderate water solubility suggests the potential for runoff in storm or irrigation water. The modelling of estimated GW and surface water EEC’s will be discussed and compared to the field results. Under field conditions, with multiple degradative pathways operating simultaneously, mandestrobin readily dissipated from bare ground and managed turf, more rapidly than under the laboratory studies.

Summary of the fate and behavior of mandestrobin in the environment

254th National Meeting (2017)

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