A crystalline modification of the compound of Formula (I) commonly known as picoxystrobin: Wherein the crystalline form conforms to various X-ray diffraction, Infra-red and scanning calorimetry data as defined within. The crystalline form of picoxystrobin may be prepared by crystallization from solution in a suitable solvent or mixtures thereof, preferred solvent systems include chloroform-hexane, THF-hexane, dichloromethane-hexane and THF water. The preparation method may also include the use of seed crystals. Fungicidal compositions comprising the crystalline form, a method for controlling fungal infestations at a locus and a use of the crystalline form are also provided.
