By M.A. Jervis

Over the prior 3 a long time there was a dramatic raise in theoretical and functional reviews on insect normal enemies. The attraction of insect predators, and parasitoids specifically, as learn animals derives from the relative ease with which many species should be cultured and experimented with within the laboratory, the easy existence cycles of so much parasitoids, and the expanding call for for organic pest control.

There is now a tremendous literature on insect normal enemies, so there's a nice want for a common textual content that the enquiring pupil or examine employee can use in opting for techniques and methods which are acceptable to the research and assessment of such bugs. This e-book fulfils that call for. A significantly up-to-date and extended model of a prior best-seller, it's an account of significant points of the biology of predators and parasitoids, punctuated with info and recommendation on which experiments or observations to behavior, and the way to hold them out. information is supplied, the place worthy, at the literature that may wish to be consulted on specific topics.

While researchers can now seek advice from numerous books on parasitoids and predators, bugs as normal Enemies is exclusive in emphasising practicalities. it really is aimed toward scholars operating in universities and either govt and advertisement institutes within the fields of pest administration, agriculture, horticulture and forestry.

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Extra info for Insect Natural Enemies: Practical Approaches to Their Study and Evaluation

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1987) re-analysed the data of van Lenteren (1976) and Klomp et al. (1980), starting with the hypothesis that superparasitism can be adaptive under certain conditions. e. superparasitism is not the result of an inability to discriminate. Van Alphen et al. (1987) argued that an inexperienced female arriving on a patch containing only parasitised hosts should superparasitise, because the probability of finding a better patch elsewhere is low. Van Lenteren's (1976) inexperienced wasps not only rejected parasitised hosts more often than unparasitised ones but also encountered significantly fewer hosts in experiments involving patches containing only parasitised hosts, compared with similar experiments involving patches containing the same density of unparasitised hosts.

An intriguing question is why it took so long before evidence was found of host discrimination by dipteran parasitoids. Host discrimination by hymenopteran parasitoids was discovered in 1926, but the phenomenon was described for tachinid flies only very recently (Lopez, Ferro and van Driesche, submitted). In field and laboratory experiments, Lopez and colleagues showed that Myiopharus doryphorae and M. aberrans, both parasitoids of Colorado Beetle (Leptinotarsa decemlineata) larvae, almost always reject parasitised larvae, whereas they readily oviposit in unparasitised larvae.

He assumed that superparasitism was caused by a failure to discriminate. Van Lenteren found that females of L. heterotoma inexperienced with unparasitised hosts readily oviposited in already parasitised hosts but avoid ovipositing in parasitised hosts after they have been able to oviposit in unparasitised ones. He concluded from this that parasitoids superparasitise because they are unable to discriminate between parasitised and unparasitised 35 hosts until they have experienced oviposition in unparasitised hosts.

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