... way to level out pests against unwanted pests. In Holland lice are damaging trees. Ladybirds are being set free into the Dutch countryside to kill the lice. The ladybirds have been imported from California where they are specially bred. This example of biological control avoids the use of pesticides completely. Also another method of biological control is sterile males. In this method a large amount of the male pest species are captured and sterilised by radiation. As a result the number of pests should decrease. The Mediterranean fruit fly had been controlled using sterile males. Things can still go wrong even when using biological methods. A predator brought in to control a pest may be wrong even when using biological methods. This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - ...

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