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Influence of Cry1Ab Protein and Hybrid Genotype on Fumonisin Contamination and Fusarium Ear Rot of Corn

^a USDA-ARS-CHPRRU, Mississippi State, MS, 39762
^b Monsanto Company, Monmouth, IL 61462
^c USDA-ARS Mycotoxin Research Unit, Peoria, IL 61604
^d Monsanto Company, Monmouth, IL 61462
^e Monsanto Company, 800 N. Lindbergh Blvd, St. Louis, MO 63167
^f University of Illinois Dep. of Crop Sciences, 1102 S. Goodwin Ave., Urbana, IL 61801

View larger version (40K): [in a new window]   Fig. 1. Fumonisin concentration in grain (A and B) and the severity of Fusarium ear rot (C and D) for Bt and non-Bt corn hybrids infested with European corn borer larvae at V8 (8 leaves with collars) and R2 (blister), or infested with corn earworm larvae at R2, or not infested with insects. Primary ears were injected with a spore suspension of F. verticillioides and F. proliferatum down the silk channel at R2 (A and C), or were not inoculated with Fusarium spp. (B and D). Lowercase letters above columns designate differences at = 0.05 between Bt and non-Bt hybrids within treatments.

View larger version (37K): [in a new window]   Fig. 2. Effect of Fusarium treatments on four nontransgenic corn hybrids evaluated for fumonisin concentration in grain (A) and severity of Fusarium ear rot (B) at Urbana, IL and Monmouth, IL in 2000 and 2001. Primary ears in inoculated plots were injected with a spore suspension of F. verticillioides and F. proliferatum down the silk channel at R2 (blister). Lowercase letters above columns designate differences at = 0.05 between inoculated and noninoculated plots of the same hybrid.

View larger version (47K): [in a new window]   Fig. 3. Fumonisin concentration in grain (A) and severity of Fusarium ear rot (B) for Bt and non-Bt corn hybrids evaluated at Urbana and Monmouth, IL, in 2000 and 2001. Lowercase letters above columns designate differences at = 0.05 between Bt and non-Bt hybrids within hybrid pairs.

View larger version (43K): [in a new window]   Fig. 4. Comparison of Bt and non-Bt corn hybrids for the presence of corn earworm (CEW) larvae, or damage from insects at Urbana and Monmouth, IL, in 2000 and 2001. Widstrom ratings for corn earworm damage were recorded as 0 = no damage, 1 = damage to silks only, 2 = kernel damage to 1 cm beyond the ear tip, and 3 = kernel damage to 2 cm beyond the ear tip. Guthrie ratings for European corn borer (ECB) damage were recorded as 0 = no visible leaf feeding, 1 = a small amount of pin or fine shot-hole injury on a few leaves, 2 = a small amount of shot-hole injury on a few leaves, and 3 = shot-hole injury common on several leaves. Lowercase letters above columns designate differences at = 0.05 between Bt and non-Bt hybrids within insect observations.