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In short-term, small-scale field experiments, population densities of two specialist herbivores differed significantly among different-sized patches of host plants. Eggs and larvae of Pieris rapae (L.) (Lepidoptera: Pieridae) were more abundant on collards planted in small (four- or nine-plant) patches than on those in large (64- or 81-plant) patches. Larvae of plutella xylostella (L.) (Lepidoptera:Plutellidae) were more abundant on collards in large (81-plant) patches.
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Lynn A. Maguire (1983) studied this question.
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