Differential Effects of Nitrogen Fertilization of Three Corn Genotypes on Biomass and Nitrogen Utilization by The Southern Armyworm, Spodoptera eridania
Differential effects of nitrogen fertilization of three corn genotypes on biomass
and nitrogen utilization by the southern armyworm, Spodoptera eridania
Syafrida Manuwoto 1, a and J.Mark Scriber a
a
Department of Entomology, University of Wisconsin, Madison, WI 53706, U.S.A.
Accepted 7 May 1985
Abstract
Maize varieties with different mechanisms of leaf-feeding resistance to the European corn borer,
Ostrinia nubilalis (Hubner), were evaluated for resistance to feeding of the southern armyworm.
Spodoptera eridania (Cramer) under 4 different levels of nitrogen fertilization in controlled
environment conditions. Armyworm feeding bioassays were conducted with the U.S. inbred,
B49, which has high tissue concentrations of DIMBOA (2,4-dihydroxy-7-methoxy(2H)-1,4benzoxazin-3(4H)one) and a Caribbean genotype (San Juan × Antigua, with mechanisms of
borer leaf-feeding resistance different from the DIMBOA type) in comparison with the borersusceptible DIMBOA-less mutant (bxbx).
The growth rate of 5th-instar larvae generally increased as plant nitrogen content increased.
However, the physiological mechanism involved for the larvae varied between corn genotypes.
For example, slow larval growth on low nitrogen treatments and on the San Juan genotype were
due to low consumption rate while on B49 slow growth occurred in spite of high consumption
rates. Different homeostatic mechanisms are used by larvae on each maize genotype to stabilize
growth rates in the final (6th) instar. The effect of nitrogen fertilization upon the cyclic
hydroxamate (e.g., DIMBOA) concentrations in B49 plants was minimal in this study.
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T3Y-48XKR9T2B&_user=9367714&_coverDate=11%2F30%2F1985&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_rerunOrigin=sc
holar.google&_acct=C000070526&_version=1&_urlVersion=0&_userid=9367714&md5=193afaf49313a24540ee1a5571d63096
and nitrogen utilization by the southern armyworm, Spodoptera eridania
Syafrida Manuwoto 1, a and J.Mark Scriber a
a
Department of Entomology, University of Wisconsin, Madison, WI 53706, U.S.A.
Accepted 7 May 1985
Abstract
Maize varieties with different mechanisms of leaf-feeding resistance to the European corn borer,
Ostrinia nubilalis (Hubner), were evaluated for resistance to feeding of the southern armyworm.
Spodoptera eridania (Cramer) under 4 different levels of nitrogen fertilization in controlled
environment conditions. Armyworm feeding bioassays were conducted with the U.S. inbred,
B49, which has high tissue concentrations of DIMBOA (2,4-dihydroxy-7-methoxy(2H)-1,4benzoxazin-3(4H)one) and a Caribbean genotype (San Juan × Antigua, with mechanisms of
borer leaf-feeding resistance different from the DIMBOA type) in comparison with the borersusceptible DIMBOA-less mutant (bxbx).
The growth rate of 5th-instar larvae generally increased as plant nitrogen content increased.
However, the physiological mechanism involved for the larvae varied between corn genotypes.
For example, slow larval growth on low nitrogen treatments and on the San Juan genotype were
due to low consumption rate while on B49 slow growth occurred in spite of high consumption
rates. Different homeostatic mechanisms are used by larvae on each maize genotype to stabilize
growth rates in the final (6th) instar. The effect of nitrogen fertilization upon the cyclic
hydroxamate (e.g., DIMBOA) concentrations in B49 plants was minimal in this study.
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T3Y-48XKR9T2B&_user=9367714&_coverDate=11%2F30%2F1985&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_rerunOrigin=sc
holar.google&_acct=C000070526&_version=1&_urlVersion=0&_userid=9367714&md5=193afaf49313a24540ee1a5571d63096