Download Control of Pests and Weeds by Natural Enemies: An by Roy van Driesche, Mark Hoddle, Ted Center PDF

By Roy van Driesche, Mark Hoddle, Ted Center

Organic keep watch over – using a inhabitants of ordinary enemies to seasonally or completely suppress pests – isn't a brand new thought. The cottony cushion scale, which just about destroyed the citrus of California, used to be managed through an brought predatory insect within the Eighties. sped up invasions by means of bugs and unfold of weedy non-native crops within the final century have elevated the necessity for using organic keep watch over. Use of rigorously selected common enemies has develop into an immense device for the security of common ecosystems, biodiversity and agricultural and concrete environments.This booklet bargains a multifaceted but built-in dialogue on significant functions of organic keep an eye on: everlasting keep watch over of invasive bugs and crops on the panorama point and transitority suppression of either local and unique pests in farms, tree plantations, and greenhouses. Written by means of major overseas specialists within the box, the textual content discusses keep an eye on of invasive species and the function of usual enemies in pest management.This booklet is vital interpreting for classes on Invasive Species, Pest administration, and Crop safeguard. it's a useful reference publication for biocontrol execs, restorationists, agriculturalists, and flora and fauna biologists.Further details and assets are available at the Editor’s personal web site at:

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Additional resources for Control of Pests and Weeds by Natural Enemies: An Introduction to Biological Control

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2005). In conservation biological control, non-crop reservoirs are used to produce parasitoids on alternative hosts on border vegetation, but these efforts may be less effective than assumed if natural enemies are conditioned to prefer the non-crop plant or alternative host. Parasitoids learn and use what they learn to help find hosts. Both conditioning and associative learning have been demonstrated amply for parasitoids. Conditioning occurs when prior experience with a host strengthens the response to that species.

Tabida, van Alphen & Galis 1983), and may even increase search time if parasitized hosts have potential to be successfully superparasitized. 6. The timing of encounters (variable influence). The patch-time allocation model of Waage (1979) and van Alphen and Jervis (1996) assumes that parasitoids have a certain level of motivation to search for hosts when they find a host patch, based on past experience and the parasitoid’s response to kairomones on the patch. This motivation wanes spontaneously over time, but can be increased or decreased based on influences encountered on the patch (see list above).

Venom paralyzes the host and preserves it from decay, and parasitoid larvae feed externally like predators (Askew & Shaw 1986, Godfray 1994). External parasitism, however, is largely restricted to leaf- or stem-miners, borers, pupae in cocoons, or gall makers, where some physical structure keeps parasitoid larvae and hosts together. qxd 1/25/08 10:21 AM Page 24 24 Part 2 Kinds of natural enemies In contrast, internal parasitism allows use of unconcealed hosts such as caterpillars, aphids, or mealybugs.

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