1 = no root rot
2 = trace of root rot
3 = bottom third of root mass rotted, may be stunted
4 = 2/3 to all root mass rotted, may be stunted
5 = all roots rotted 10-30% seedlings killed, stunting slight to moderate
6 = all roots rotted, ca. 50% seedling kill, moderate to severe stunting
7 = 75% seedling kill, severe stunting
8 = 90% seedling kill
9 = all seedlings dead at or before crook stage
10 = all seedlings killed before emergence
Rating Scale for Inoculum Layer Test
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