Environmental Entomology (1983) 12, 1415-1419

Lynn A. Maguire (1983)
Influence of collard patch size on population densities of Lepidopteran pests (Lepidoptera: Pieridae, Plutellidae)
Environmental Entomology 12 (5), 1415-1419
Abstract: 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Plutella xylostella	Cabbage (Brassica oleracea)	U.S.A. (SW)
	Pieris rapae	Cabbage (Brassica oleracea)	U.S.A. (SW)