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International Journal of Tropical Insect Science

, Volume 14, Issue 1, pp 101–106 | Cite as

The Susceptibility to Malathion of Metopolophium Dirhodum on Two Wheat Species at Two Growth Stages, and the Effect of Plant Growth Regulators on This Susceptibility

  • P. K. Attah
  • H. F. van Emden
Research Article

Abstract

Malathion tolerance of the rose-grain aphid Metopolophium dirhodum (Walker) reared on the ancient wheat variety Emmer (Triticum dicoccum L.) was tested by topical bioassay and found to be lower than that of aphids reared on the modern more susceptible variety Maris Kinsman (T. aestivum L.). On both varieties, tolerance was greater at stem elongation than at the tillering stage of plant growth. All statistically significant differences when plants were treated with Cycocel and MCPA showed that the two chemicals, respectively, reduced and increased aphid tolerance to malathion, in keeping with the effects of the chemicals on induced plant resistance to aphids reported in the literature. Probit mortality slopes were not progressively altered by changes in LC50, so that similar differences in aphid tolerance to malathion were found at both LC50 and LC90 levels.

Key Words

Plant resistance insecticide tolerance malathion Metopolophium dirhodum 

Résumé

La tolérance au malathion du puceron Metopholophium dirhodum (Walker) élevé sur l’espèce ancien “Emmer” (Triticum dicoccum L.) est apparue inférieure à celle des pucerons élevés sur l’espèce moderne, plus sensible “Maris Kinsman” (T. aestivum L.). Sur les deux espèces, la tolérance a été plus importante au stade elongation de l’entre-noeud qu’à celui de tallage. Toutes différences statistiquement significatives, avec des plantes préalablement traitées avec Cycocel et MCPA, ont montré que les deux composés ont, respectivement, réduit et accentué la tolérance du puceron au malathion, conformément aux résultats reportés dans la literature avec des composés utilisés sur la sensibilité aux pucerons des plantes traitées. Le taux de mortalité n’a pas montré un changement progressif en fonction de LC50, si bien que des résultats similaires concernant la tolérance des pucerons au malathion ont été trouvés aux deux niveaux LC50 et LC50.

Mots Clés

Resistance végétale tolérance insecticide malathion Metopolophium dirhodum 

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Copyright information

© ICIPE 1993

Authors and Affiliations

  • P. K. Attah
    • 1
  • H. F. van Emden
    • 1
  1. 1.Department of HorticultureUniversity of ReadingReadingUK

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