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Contrasting Toxic-Endophyte Contamination between Endophyte-Free and Nontoxic-Endophyte Tall Fescue Pastures

^a Dep. of Hort. and Crop Sci., The Ohio State Univ., Columbus, OH 43210
^b The Ohio State Univ. Ext., Guernsey Co., Cambridge, OH 43725
^c The Ohio State Univ. Ext., Morgan Co., McConnelsville, OH 43756
^d The Ohio State Univ. Ext., Jackson Co., Jackson, OH 45640

View larger version (20K): [in this window] [in a new window]   Fig. 1. Relationships between observed and expected endophyte levels during September 2001, for two tall fescue treatments sown in mixtures with K31/Toxic-E in April 2001 at three Ohio sites (Table 3). Each point is the average of three replicates, mean standard error = 4.7, ns = regression not significant, * = regression significant at P < 0.05.

View larger version (20K): [in this window] [in a new window]   Fig. 2. Relationships between observed and expected endophyte levels during June 2002, for two tall fescue treatments sown in mixtures with K31/Toxic-E in April 2001 at three Ohio sites (Table 3). Each point is the average of three replicates, mean standard error = 6.3, ns = regression not significant, * = regression significant at P < 0.05.

View larger version (19K): [in this window] [in a new window]   Fig. 3. Relationships between observed and expected endophyte levels on 3 Sep. 2002, for two tall fescue treatments sown in mixtures with K31/Toxic-E in Apr. 2001 at three Ohio sites (Table 3). Each point is the average of three replicates, mean standard error = 6.1, ns = regression not significant, * = regression significant at P < 0.05.

View larger version (24K): [in this window] [in a new window]   Fig. 4. Proportion of tall fescue tillers containing ergopeptine alkaloids (% of 20 tillers tested per plot) at three sites and 2 yr, following sowing in April 2001. Each point is the average of three replicates, mean standard error = 5.4, ns = regression not significant, * = regression significant at P < 0.05.