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This article in JEQ

  1. Vol. 1 No. 3, p. 259-265
     
    Received: Dec 13, 1971


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doi:10.2134/jeq1972.00472425000100030011x

Genetic Interrelationships Between Host Plants and Insects1

  1. R. L. Gallun2

Abstract

Abstract

Growing plant varieties that are resistant to insects is the ideal way to protect the crop against insect losses and at the same time prevent pollution of the environment. Resistance to insects is genetically controlled and expressed as antibiosis, nonpreference, and tolerance. The ability of the insect to attack the plant is also genetically controlled and expresses itself in the form of insect variants called biotypes. Biotypes develop because of selection pressure from resistant varieties and are able to survive, interbreed and develop into epidemic numbers. The genetic interrelationship that exists between the host plant and insect has been studied for some insects and has resulted in a better understanding of how to control insects by resistant varieties. Dynamic plant breeding programs can utilize insect biotypes for locating new sources of resistance, distinguishing between sources of resistance, and determining the inheritance of resistance. In some cases, biotypes having genes that are dominant for avirulence can be systematically released in populations of insects having recessive genes for virulence, resulting in genetic control of the insect after a few generations of release.

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