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


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 


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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  1. Carter N., Dixon A. F. G. and Rabbinge R. (1982) Cereal Aphid Populations: Biology, Simulation and Prediction. Pudoc Publications, Wageningen.Google Scholar
  2. El-Amin E. H. (1975) Studies on the ecology of aphids on spring cereals and maize. PhD. thesis, University of London.Google Scholar
  3. Finney D. J. (1971) Probit Analysis. Cambridge University Press, Cambridge.Google Scholar
  4. Hintz S. D. and Schulz J. T. (1969) The effect of selected herbicides on cereal aphids under greenhouse conditions. Proc. N. Centr, Brch. Entomol. Soc. Am. 24, 114–117.Google Scholar
  5. Lowe H. J. B. (1974) Effects of Metopolophium dirhodum on spring wheat in the glasshouse. Plant Pathol. 23, 136–140.CrossRefGoogle Scholar
  6. Mohamad B. M. and van Emden H. F. (1989) Host plant modification to insecticide susceptibility in Myzus persicae (Sulz.). Insect Sci. Applic. 10, 699–703.Google Scholar
  7. Potter C. and Gillham E. M. (1957) Effect of host plant on the resistance of Acyrtosiphon pisum (Harris) to insecticides. Bull. Entomol. Res. 48, 317–322.CrossRefGoogle Scholar
  8. Raman K. V. (1977) Studies on host plant resistance of cowpeas to leafhoppers. PhD. thesis, University of Reading.Google Scholar
  9. Rautapää J. (1972) Effects of herbicides and chlormequat chloride on host plant selection and population growth of Macrosiphum avenue (F.) (Homoptera: Aphididae). Ann. Agric. Fenn. 11, 135–140.Google Scholar
  10. Ries S. K. (1976) Subtoxic effects on plants. In Herbicides: Physiology, Biochemistry, Ecology (Edited by Audus L. J.), Vol. 2, pp. 313–344. Academic Press, London.Google Scholar
  11. Sawicki R. M and Rice A. D. (1978) Response of susceptible and resistant peach potato aphids Myzus persicae (Sulz.) to insecticides in leaf-dip bknssays. Pestic. Sci. 9, 513–516.CrossRefGoogle Scholar
  12. Seiander J., Markkula M. and Tiittanen K. (1972) Resistance of the aphids, Myzus persicae (Sulz.), Aulacorthum solani (Kalt) and Aphis gossypii Glov. to insecticides and the influence of host plantontiiisiesistance. Ann.Agric.Fenn. 11, 141–145.Google Scholar
  13. Sotherton N. W. and van Emden H. F. (1982) Laboratory assessnients of resistance to theaphids Sitobion avenae and Metopolophium dirhodum in three Triticum species and two modem wheat cultivars. Ann. Appl. Biol. 101, 99–107.CrossRefGoogle Scholar
  14. Tottman D. R., Makepeace R. J. and Broad H. (1979) An explanation of the decimal code for the growth stages of cereals with illustrations. Ann. Appl. Biol. 93, 221–234.CrossRefGoogle Scholar
  15. van Emden H. F. (1964) Effect of (2-chloroethyl) trimethyl ammonium chloride on the rate of increase of the cabbage aphid Brevicoryne brassicae L. Nature, Lond. 201, 946–948.CrossRefGoogle Scholar
  16. Watt A. D. (1979) Life history strategies of cereal aphids. PhD. thesis, University of East Anglia.Google Scholar
  17. Watt A. D. and Dixon A. F. G. (1981) The role of cereal growth stages and crowding in the induction of alatae in Sitobion avenae and its consequences forpopulation growth. Ecol. Entomol. 6, 441–447.CrossRefGoogle Scholar

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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