Interplot Interference in Field Plots with Leaf Rust of Maize

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Abstract
Interplot interference, or the influence of one host genotype on another when grown in adjacent plots, can be a problem with the evaluation of partial resistance to airborne pathogens. Moreover, interplot interference may affect selection in the plant breeding nursery. To estimate the degree of interference in a typical sweet corn (Zea mays L.) breeding nursery, the partial resistance of 3 hybrids grown in several field plot treatments was examined. Treatments consisted of differing spatial arrangements of the 3 hybrids. In a 2-year study, mean rust level differed significantly for 5 field plot treatments. As the potential for leaf rust increased, the ability to distinguish between hybrid disease reaction diminished. In addition, the variability in disease reaction was reduced as rust potential increased for hybrid and field plot treatment, indicating that when high levels of leaf rust existed, disease gradients tended to flatten.

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