Fall Armyworm Symposium--1988: Evaluation of Rice Cultivars for Antibiosis and Tolerance Resistance to Fall Armyworm (Lepidoptera: Noctuidae)

  • Ben-Huai Lye
  • C. Michael Smith


The effects of antibiosis on the growth of fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith), larvae by rice, Oryza sativa L., seedlings at different plant stages and the tolerance of seedlings to artificial defoliation at the 7-leaf stage were evaluated in five plant introductions (PI) and the check cultivar `Mars'. FAW larvae fed 5-leaf stage foliage had significantly lower larval, pupal, and adult weights than larvae fed 3-leaf stage foliage. The effects of antibiosis on the growth of FAW were evident in PIs 160842, 160827, 346833, and 346839, but not in PI 160823 or Mars. PIs 160842, 160827, and 160823 exhibited higher tolerance in plant regrowth after defoliation than PI 346833, 346839, or Mars. PIs 160842 and 160827 exhibited both the antibiosis and tolerance resistance.
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