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Insect resistant sorghums in pest management

Published online by Cambridge University Press:  19 September 2011

George L. Teetes
George L. Teetes
Affiliation:
Department of Entomology, Texas A&M University, College Station, TX 77843, U.S.A.
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Abstract

The agroecosystem is the basic unit of consideration in the integrated pest management approach. The target crop within this ecological system and its level of susceptibility to insect pest species is of fundamental importance, and can be altered genetically through breeding for pest resistance. The relative level of pest resistance as influenced by pest density, demands a knowledge of pest density and plant damage (yield) relationships. An understanding of these relationships leads to the determination of economic injury levels and subsequently to the establishment of dynamic economic threshold levels. Comparing the economic injury level of insect resistant cultivars to that of susceptible cultivars defines the resistance level and provides the base-line data on which to quantify the effects of other direct control tactics and natural pest density suppressing agents.

Insect resistant sorghums are used as a model to examine the unique values of this tactic as a component in an integrated pest management strategy; the role they play, and how they influence other direct control and support tactics.

Résumé

L'agroécosystème est l'unité de base pour une approche de lutte intégrée. Dans cet écosystème, la culture-clé et son niveau de susceptibilité aux espèces d'insectes ravageurs sont fondamentals et peuvent être modifiés par l'amélioration génétique de la résistance aux espèces nuisibles. Une connaissance des relations densité d'insectes et perte de rendement est nécessaire car le niveau de résistance depend de la densité des insectes présents, la compréhension de ces relations permet de déterminer les seuils de pertes économiques et donc d'établir une échelle dynamique des seuils d'action. La comparaison des seuils de pertes économiques des variétés résistantes et des variétés susceptibles définit le niveau de résistance et fournit des données de base qui permettent de quantifier les effets de tactiques de contrôle direct ou d'agents naturels suppresseurs d'insectes.

Les sorghos résistant aux insectes sont utilisés comme modèle pour étudier les caractéristiques uniques de cette tactique en tant que composante d'une stratégie de lutte intégrée. Le role de ces sorghos et la manière dont ils influencent les méthodes de contrôle direct et indirect sont également étudiées.

Keywords

Plant resistancepest managementdensity-damage relationshipseconomic threshold levelssorghum midgeContarinia sorghicola
Type
Section VI: Host plant resistance and pest management
Information
International Journal of Tropical Insect Science , Volume 6 , Special Issue 3: Host Plant Resistance and its Significance in Pest Management , June 1985 , pp. 443 - 451
Copyright
Copyright © ICIPE 1985

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References

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