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Ecological Methods in Forest Pest Management$
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David Wainhouse

Print publication date: 2004

Print ISBN-13: 9780198505648

Published to Oxford Scholarship Online: April 2010

DOI: 10.1093/acprof:oso/9780198505648.001.0001

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Resistance to attack by pests and pathogens

Resistance to attack by pests and pathogens

(p.82) Chapter 5 Resistance to attack by pests and pathogens
Ecological Methods in Forest Pest Management

David Wainhouse

Oxford University Press

Most tree species are undomesticated and, in contrast to agricultural crops, there is often considerable genetic variation in the expression of resistance to different pests and pathogens within forests. This chapter focuses on the nature, physiological constraints, and environmental influences on resistance expression in trees. Following a brief discussion of defence theory, the genetic basis of resistance is discussed with examples of both preformed and induced resistance mechanisms in leaves, and in bark and wood. Ways of measuring resistance, the choice of appropriate discriminating assays for both insects and fungi, and the exploitation of natural variation in resistance in pest management are discussed. In practice, several defensive traits may determine the outcome of attack and this is briefly discussed under the theme of integrated resistance. In the final section, the topic of breeding for resistance is introduced, followed by a brief discussion of the potential for genetic modification of resistance expression.

Keywords:   preformed defence, induced resistance mechanisms, integrated resistance, resistance to attack, genetic modification

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