Feeding activity, growth, and survival of soybean looper on low-nitrogen nonnodulating soybean

Feeding and larval development of several lepidopteran species are influenced by reduced foliage N of host plants. Nonnodulating soybean [Glycine max (L.) Merr.] isolines have exhibited foliar symptoms typical of N deficiency in field plots in absence of supplemental N. Under these chlorotic conditi...

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Published inAgronomy journal Vol. 86; no. 6
Main Authors Wier, A.T. (Louisiana Agric. Exp. Stn., Baton Rouge, LA.), Boethel, D.J
Format Journal Article
LanguageEnglish
Published 01.11.1994
Subjects
CHLOROSE
CHRYSODEIXIS
CLOROSIS
COMPORTEMENT ALIMENTAIRE
CONTENIDO DE NITROGENO
DESARROLLO BIOLOGICO
DEVELOPPEMENT BIOLOGIQUE
DIETA
ETAPAS DE DESARROLLO DE LA PLANTA
FEUILLE
FORMATION DE NODOSITES
GENOTIPOS
GENOTYPE
GLYCINE MAX
HABITOS ALIMENTARIOS
HOJAS
LARVAS
LARVE
NODULACION
REGIME ALIMENTAIRE
STADE DE DEVELOPPEMENT VEGETAL
TENEUR EN AZOTE
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Summary:Feeding and larval development of several lepidopteran species are influenced by reduced foliage N of host plants. Nonnodulating soybean [Glycine max (L.) Merr.] isolines have exhibited foliar symptoms typical of N deficiency in field plots in absence of supplemental N. Under these chlorotic conditions, reduced defoliation and larval development of soybean looper [Lepidoptera:Noctuidae, Pseudoplusia includens (Walker)] have been observed. This study was conducted to evaluate the influence of foliage N level of nodulating and nonnodulating soybean isolines on feeding and development of the soybean looper. Two feeding studies involving the soybean looper and foliage of nodulating and nonnodulating isolines of 'Clark' soybean were conducted using foliage collected from plants in full bloom (R2) and in the beginning seed stage (RS). The foliage N level of the nonnodulating isoline was not significantly lower than that of the nodulating isoline when collected at R2 and, consequently, only slight effects on feeding and development were attributable to consumption of nonnodulating isoline foliage. However, chlorosis and a 43% reduction in the foliage N level of the nonnodulating isoline occurred by R5, resulting in limited compensatory feeding, extended larval development, and reduced survival when soybean loopers consumed this isoline. Foliage N concentrations of approximately 40 mg g-1 leaf dry weight were sufficient for soybean looper development from the neonate to the adult stage, while concentrations of 23 mg g-1 leaf dry weight were inhibitory
Bibliography:F30
H10
9561086
ISSN:0002-1962
1435-0645
DOI:10.2134/agronj1994.00021962008600060030x