Abstract
The interaction between the protozoan parasite Nosema pyrausta Paillot and maize that was susceptible, intermediate in resistance, and resistant to leaf feeding by the European corn borer Ostrinia nubialis (Hübner) (inbred lines WF9, W22, and Oh43, respectively) was evaluated by artificially infesting plants with corn borer egg masses infected or uninfected with N. pyrausta . Both N. pyrausta and resistance factors reduced the number of larvae/plant, and the interaction of host plant resistance × N. pyrausta reduced populations significantly in 2 of 3 yr. Also, both N. pyrausta and resistance contributed to a reduction in the weight of the larvae. The incidence and degree of infection were dependent only on N. pyrausta (egg mass source); resistance had no effect. A wide distribution of N. pyrausta could have an impact on natural populations of corn borers.
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