Pyraclostrobin is a quinone outside inhibitor (QI)-type fungicide used in agriculture. Among the QIs, it lies within the strobilurin chemical class.
Pyraclostrobin is used to protect Fragaria, Rubus idaeus, Vaccinium corymbosum, Ribes rubrum, Ribes uva-crispa, blackberry (various Rubus spp.), and Pistachio vera.
Pyraclostrobin is used against Botrytis cinerea and Alternaria alternata.
Resistant populations have been identified in:
Pyraclostrobin was widely used throughout the United States, but especially in the Upper Midwest.
Although toxic, and recommended to be avoided by humans, pyraclostrobin is of temporary and low toxicity, that is to say it is merely an irritant of eyes and skin. It does cause some degree of reproductive and developmental failure in mammals but does not absorb well through the skin. It is likely to bioaccumulate in aquatic organisms.
Pyraclostrobin does not accumulate in foods to a significant degree.
Pyraclostrobin is described by one source as not very biodegradable, and by another as possibly significantly biodegradable.