Abstract
Apanteles popularis, a parasitoid of Tyria jacobaeae, does not regulate its host numbers, though the percentage attack may be very high. The effects of food shortage of the host on its parasite are discussed and suggestions are made why Apanteles does not regulate its host. This lack of a regulating influence is also mentioned in several other parasite-host studies in naturally evolved systems. A hypothesis on co-selection is formulated that might explain the difference in effect of parasites in naturally evolved systems and man-made systems, where biological control through imported parasites is often successful.
Published Version
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