An oilseed coating composition comprises at least one organic carrier material, in the form of particles, selected from waxes having a melting point of at least 50°C； and one or more biological agents that possess an activity against at least one or more pathogens of an oilseed plant. The wax may be carnauba wax, beeswax, chinese wax, montan wax, shellac wax, spermaceti wax, candelilla wax, castor wax, ouricury wax or rice bran wax, and the particles can have a volume mean diameter of at least 5 micron. The biological agent may be a fungicide, an arthropodicide including insecticides or acaricides, a bactericide or a live biological agent. Preferably, the insecticides are selected from nicotinoid, methylcarbamate, oxime carbamate and thiazole insecticides； or mixtures of two or more thereof. The oilseeds can be canola, sunflower, oilseed rape, peanut, safflower, sesame, linseed, mustard, castor, jojoba, carob, coriander, grape, flax, dika, hemp, pine, poppy or okra seeds. A method of coating an oilseed is also claimed which comprises the addition of a biological antagonist to an organic carrier material, wherein the organic carrier material is in dry particulate form, mixing the two components together and applying the resultant composition to the seeds.
