Fig. 10. Fusarium ear rot severity (top) and fumonisin B₁ concentrations in kernels of Bt and conventional corn hybrids in a field experiment conducted in Story Co., IA, in 1998. Asterisks indicate significant differences within Bt and conventional hybrid pairs (alpha = 0.05). Natural ECB infestation – endemic insect populations only; Manual ECB infestation – 50 neonatal European corn borer larvae were placed on each plant at the whorl stage and silking stage. 

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