Effects of Experimental Design and Nitrogen on Cabbage Butterfly Oviposition

To test the prediction that P. rapae egg densities increase with N fertilizer in large-scale systems as they do in model systems with potted plants, we used field experiments with Brassica oleracea var. acephala L. (collards and kale) planted in pots or large field plots, and treated with different...

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Bibliographic Details
Published in:Oecologia 1989-08, Vol.80 (2), p.211-214
Main Authors: Letourneau, D. K., Fox, L. R.
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
Biological and medical sciences
Butterflies
Crops
Eggs
Fertilizers
Fundamental and applied biological sciences. Psychology
Herbivores
Leaves
Lepidoptera
Nitrogen
Oviposition
Pieridae
Plants
Potted plants
Protozoa. Invertebrata
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Summary:To test the prediction that P. rapae egg densities increase with N fertilizer in large-scale systems as they do in model systems with potted plants, we used field experiments with Brassica oleracea var. acephala L. (collards and kale) planted in pots or large field plots, and treated with different levels of nitrogen fertilizer. In small-scale field experiments with potted kale and collards, egg densities were significantly higher on plants with high N than those with low N. But in larger scale experiments with field-grown collards, average seasonal P. rapae egg densities were not significantly correlated with leaf N content. These differences among experiments did not depend on the magnitude of the difference in foliage N levels.
ISSN:0029-8549
1432-1939
DOI:10.1007/BF00380153