A coating composition for application to a vegetable plant structure, such as seeds, roots, tubers, and bulbs, 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 a vegetable plant. The wax may be carnauba wax, beeswax, chinese wax, shellac wax, spermaceti wax etc., 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. The live biological agent can be a biological antagonist in the form of bacterial spores and/or fungal spores located on the surface of the particles or vegetable plant structure. A method of coating a vegetable plant structure is also claimed which comprises the addition of a biological agent 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 vegetable plant structure.
