An absorbent sheet material for application to plant wounds comprises a flexible laminate of sheet material (the distal layer) and a permeable layer (the proximal layer), the layers being bonded together and the laminate containing in the proximal layer or between the layers, liquid absorbing solid particles and/or fibrous absorbent material and the laminate containing or having its proximal surface coated with a biologically active material which is a biostat or a biocide.