Download Insects as Natural Enemies. A Practical Perspective by Mark A. Jervis PDF

By Mark A. Jervis

Over the earlier 3 a long time there was a dramatic raise in theoretical and functional reports on insect common enemies. The charm of insect predators, and parasitoids particularly, as study animals derives from the relative ease with which many species might be cultured and experimented with within the laboratory, the straightforward lifestyles cycles of such a lot parasitoids, and the expanding call for for organic pest control.

There is now an important literature on insect traditional enemies, so there's a nice desire for a common textual content that the enquiring pupil or examine employee can use in selecting techniques and methods which are acceptable to the research and overview of such bugs. This publication fulfils that call for. A significantly up-to-date and improved model of a prior best-seller, it really is an account of significant points of the biology of predators and parasitoids, punctuated with info and suggestion on which experiments or observations to behavior, and the way to hold them out. tips is supplied, the place valuable, at the literature that may wish to be consulted on specific topics.

While researchers can now confer with numerous books on parasitoids and predators, bugs as usual Enemies is exclusive in emphasising practicalities. it's aimed toward scholars operating in universities and either executive and advertisement institutes within the fields of pest administration, agriculture, horticulture and forestry.

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Extra resources for Insects as Natural Enemies. A Practical Perspective

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E. all-or-none preferences predicted by static prey choice models. If one is interested in questions such as how egg load should influence host selection, one should construct dynamic optimisation models as described by Mangel and Clark (1988. , 1998, for an example). 10), gregarious parasitoids must make an additional decision after accepting a host for oviposition: how many eggs to lay in (or on) a host. Waage and Godfray (1985), Waage (1986) and Godfray (1987a,b) have addressed this question.

Kairomones present on the host itself have also been shown to induce oviposition behaviour by several parasitoid species. , 2000). A similar response is shown by the parasitoid Diadromus pulchellus. , 1999). Because stronger responses may be found to a kairomone after prior oviposition experience in the presence of the substance, an initial experiment ought to be performed using parasitoids with previous oviposition experience. g. clean host plant leaves), with the response to patches within which hosts have previously occurred for some time.

1998) suggest that the parasitoids in these systems use different mechanisms to overcome the reliability-detectability problem. Cotesia kariyae responded to volatiles that provide direct evidence of the presence of potential suitable hosts, whereas C. glomerata responded to volatiles produced in response to plant damage. Rorippa indica has few herbivore species, of which Pieris brassicae is one of the dominant, so responding to general damage cues is likely to lead the parasitoid to potential hosts.

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