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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

Published online by Cambridge University Press:  19 September 2011

P. K. Attah  and
H. F. van Emden
P. K. Attah*
Affiliation:
Department of Horticulture, University of Reading, Reading RG6 2AS, UK
H. F. van Emden
Affiliation:
Department of Horticulture, University of Reading, Reading RG6 2AS, UK
*
*To whom correspondence should be addressed.
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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 Marts 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 LC59 and LC90 levels.

Résumé

La tolérance au malathion du puceron Metopholophium dirhodum (Walker) éievé sur l'espece ancien “Emmer” (Triticum dicoccum L.) est apparue inférieure à celle des pucerons élvés sur l'espèce moderne, plus sensible “Marls Kinsman” (T. aestivum L.). Sur les deux espèces, la tolérance a été plus importante au stade élongation 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, reduit et accentué la tolérance du puceron au malathion, conformément aux réultats réportes dans la litérature 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 Men que des résultats similaires concemant la tolérance des pucerons au malathion ont été trouvés aux deux niveaux LC50 et LC50.

Keywords

Plant resistanceinsecticide tolerancemalathionMetopolophium dirhodumResistance végétaletolérance insecticidemalathionMetopolophium dirhodum
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 14 , Issue 1 , February 1993 , pp. 101 - 106
Copyright
Copyright © ICIPE 1993

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