notes14 - Objectives Biological Control 1. 2. 3. 4. 5....

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1 1 Biological Control The wasp parasitoid Cardiochiles nigriceps Viereck, approaches a potential host, an adult tobacco budworm, Heliothis virescens (Fabricius). 2 Objectives 1. Define biological control 2. Describe the three major types of biological control 3. Describe six typical augmentation products 4. Name and describe, using a specific example, three types of cultural control methods 5. Explain how the sterile release method of insect control works and give an example of its effective use This wasp is commercial y sold. It is injecting eggs into the host. 3 Introduction Biological control is one of the most interesting areas of entomological research and a topic that students often become very interested in. The term biological control is one that most of you have heard many times, and you probably have a rough idea of what it means. But before we go any further we should define the term so you will know exactly what biological control entails. There is a bit of reading for this unit, so before you get too far into the lecture, be sure to cover the reading assignment for this unit. Biological control is: The intentional manipulation of populations of living beneficial organisms, called natural enemies, in order to limit populations of pest insects. There are some key words in that definition that should be emphasized, so let's take a closer at the definition with some additional comments added that will help you analyze it. The intentional (deliberate) manipulation (we do something to cause a change) of populations (not just one praying mantis) of living (not chemicals derived from dead organisms) beneficial organisms, called natural enemies, in order to limit (not eliminate) populations of pest insects. Read textbook pages 407-420. 4 Types of Biological Control Biological Control can be divided into three different categories or types. These divisions are useful ways to look at the subject. The three types are: 1. Classical Biological Control 2. Conservation 3. Augmentation Classical The first of these types, classical biological control , is best described as "the reuniting of old enemies," a term that will take some explanation. First, we must recognize that most serious pests are invaders, usually from another country. These invaders arrive, usually accidentally as part of shipments of plants or food products. When they arrive, they are in a new habitat that lacks the natural enemies (insect predators and parasitoids, and diseases) that were adapted to keep that species population numbers in check. Without these natural enemies, the population of the invasive species becomes very large which is usually why it is a pest. Reuniting old enemies means that the natural enemies that are adapted to kill and control an insect's population are imported from the country of origin and released in the new place the pest has invaded. 5
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This note was uploaded on 07/23/2011 for the course ENY 3005 taught by Professor Staff during the Spring '08 term at University of Florida.

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notes14 - Objectives Biological Control 1. 2. 3. 4. 5....

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