Spots And Rots A wide variety of flower and fruit spots and rots attacks almost all plants during wet, humid weather. Azalea, camellia, gladiolus, and many vegetables and fruits suffer most. Spots are small, black, scabby patches. Rots are decay, decomposition, or disintegration of plant tissue. Flowers may be blighted or not set fruit. Spray or dust plants regularly during flowering. Collect and destroy affected parts. Avoid overcrowding and overfertilization. Plant crops on a four-year rotation in well-drained soil.