Responses of Chilo partellus (Lepidoptera: Pyralidae) and Busseola fusca (Lepidoptera: Noctuidae) to Hybrids of a Resistant and a Susceptible Maize

1 June 1993

journal article
Published by Oxford University Press (OUP) in Journal of Economic Entomology

Vol. 86 (3) , 962-968
https://doi.org/10.1093/jee/86.3.962

Abstract

Two parental maize (Zea mays L.) lines, a susceptible inbred ‘Inbred A’ and a resistant inbred ‘Mp704’, were evaluated along with their F 1 hybrids, ‘Mp704’ × ‘Inbred A’ and ‘Inbred-A’ × ‘Mp704’, for resistance to Chilo partellus (Swinhoe) and Busseola Fusca Fuller in a screenhouse. Factors reducing oviposition on ‘Mp 704’ in choice tests were not manifested in the one F₁ hybrid tested. However, the antibiosis mode of resistance operating within the resistant parent ‘Mp704’ was generally expressed in the F₁ hybrids. The resistant parent and the F₁ hybrids showed significantly lower foliar damage ratings as well as stem damage than the susceptible parent against both stem borers under artificial infestation. Larval survival on the F₁ hybrids was as low as on ‘Mp704’. As measured by nutritional indices, poor food utilization but high relative consumption rate on resistant ‘Mp704’ and low consumption rate but high food utilization on F₁ hybrids resulted in slow development and low biomass gained by C. partellus and B. fusca on these cultivars.

Keywords

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