Figure 13. On infested trays, sclerotia (resting structures of Rhizoctonia) can be easily observed as small, dark brown scars on the surface of the infested tray. 
Figure 14.  Sclerotia on surface of trays can easily be eliminated or inactivated with good cleaning practices and using a chlorox solution.
Figure 15. Sclerotia formed in crevices of styrofoam trays are more difficult to eliminate.
Figure 16. Sclerotia formed in crevices of styrofoam trays are better protected from unfavorable environmental conditions and common cleaning practices which fail to inactivate or eliminate them.