Cumulative Effects of Antibiosis on Five Biological Parameters of the Fall Armyworm

Authors

  • B. R. Wiseman

Abstract

Results of a laboratory study showed that even low levels of resistant maize, Zea mays L., silks reduced fall armyworm, Spodoptera frugiperda (J. E. Smith) growth, extended the life cycle, and reduced fecundity in four of five generations. An intermediate level of resistance reduced growth, extended the life cycle by an average of about 4 d and significantly reduced fecundity in each of the five generations. A high level of resistant silks reduced growth significantly, extended the life cycle on an average of about 10 d per generation and reduced fecundity by almost 50% over that for the laboratory control in generations four and five. Though the estimated fecundity was not greatly reduced in all generations, there were no apparent adjustments to the stress of various levels of resistance after five generations. Thus, fall armyworm fed on various levels of resistant silk-diets did not appear to adjust to the resistance in any of the five parameters measured after five generations.

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Published

1999-06-01

Issue

Section

Literature Review Articles