Spore distribution. Photo of a piece of proofing paper surface sprayed (left) or coated (right) with fungus formulation (zoomed in 4 ×). Equal volumes of a 5 × 109 spores/ml formulation (20% Ondina/80% Shellsol) were applied per surface area using the spray method described by Bell et al  or the optimized coating method. Spots on the left piece represent the spray droplets. The white background is not visible on the coated piece (right) because it is covered fully with the spore layer.