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Fusarium Head Blight Infection following Point Inoculation in the Greenhouse Compared with Movement of Fusarium graminearum in Seed and Floral Components

Dep. of Agronomy and Plant Pathology, Univ. of Kentucky, Lexington, KY 40546-0312

View larger version (58K): [in this window] [in a new window]   Fig. 1. Average percentage infection (y axis) and movement of Fusarium graminearum in floral components of eight wheat spikes in spikelets below (–) and above (+) the point of inoculation (0) (x axis) for (A) Ernie, (B) Roane, (C) SC 921299, and (D) GA 89482-E7 in 2000.

View larger version (32K): [in this window] [in a new window]   Fig. 2. Relationship of F. graminearum seed infection and visual Fusarium head blight (FHB) spikelet infection (severity) for individual spikes (open symbols) and means of 4 or 5 spikes (closed symbols) of the same genotypes in the Uniform Northern (A, C, n = 49) and Southern (B, D, n = 29) FHB greenhouse nurseries following greenhouse point inoculations in 2001.

View larger version (28K): [in this window] [in a new window]   Fig. 3. Average F. graminearum seed infection for spikelets above (+) or below (–) the inoculated spikelet (0) in (A) highly susceptible (>75% greenhouse spikelet infection) (B) susceptible (50–75% greenhouse spikelet infection), and (C) resistant (<25% greenhouse spikelet infection) cultivars and breeding lines from Uniform Northern and Southern FHB nurseries in 2001.

View larger version (26K): [in this window] [in a new window]   Fig. 4. Relationship between average F. graminearum seed infection for field harvested seed from the Uniform Northern (open circles) and Southern (closed circles) Fusarium head blight (FHB) Nurseries in 2001 to (A and B) mean FHB head severity before havest, and (C and D) visual estimates of scabby seeds harvested from the same field. All relationships were nonsignificant (P = 0.05).