Entomophaga

, Volume 21, Issue 2, pp 127–130 | Cite as

Competitive displacement ofAnagyrus antoninae [Hym.: Encyrtidae]. by its ecological homologueNeodusmetia sangwani [Hym.: Encyrtidae]

  • M. F. Schuster
  • H. A. Dean
Article

Abstract

The displacement ofAnagyrus antoniaaeTimberlake byNeodusmetia sangwani (Rao) was demonstrated by reduced parasitism by the former in two localities after the latter was introduced into these sites. The competitive factors were: (1) the host-regulative action ofN. sangwani maintained a low host reciprocal balance, and (2) the inability of the female ofA. antoninae at the prevailing host density to find hosts sufficient for reproduction. The lack of competitiveness ofA. antoninae was a result of its inability to develop at high vapor deficits.

Keywords

Plant Pathology High Vapor Host Density Competitive Displacement Competitive Factor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Résumé

Le déplacement deAnagyrus antoninaeTimberlake parNeodusmetia sangwani (Rao) a été, démontré par le parasitisme moindre du premier dans deux localités après l'introduction du second dans cas sites. Les facteurs de compétition sont:
  1. 1o

    l'action régulatrice des populations de l'hôte parN. sangwani se maintient aux faibles densités,

     
  2. 2o

    l'incapacité de la femelle deA. antoninae de trouver suffisamment d'hôtes pour la reproduction, lorsque la densité des hôtes prédomine. Le manque de compétitivité deA. antoninae est une conséquence de son incapacité de se développer lorsqu'il fait très sec.

     
This is a preview of subscription content, log in to check access.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Andrewartha, H. G. &Birch, L. C. — 1954. The Distribution and Abundance of Animals. —Univ. of Chicago Press, Chicago.Google Scholar
  2. Ayala, F. J. — 1969. Experimental invalidation of the principle of competitive exclusion. —Nature 224, 1076–9.PubMedGoogle Scholar
  3. Dean, H. A. — 1964. Introduction and establishment ofAnagyrus antoninae on rhodesgrass scale in Mexico. —J. Econ. Entomol., 53, 694.Google Scholar
  4. Dean, H. A. &Schuster, M. F. — 1958. Biological control of rhodesgrass scale in Texas. —J. Econ. Entomol., 51, 363–366.Google Scholar
  5. Dean, H. A., Schuster, M. F. &Bailey, J. C. — 1961. The introduction and establishment ofDusmetia sangwani onAntoninae graminis in south Texas. —J. Econ. Entomol., 54, 952–954.Google Scholar
  6. DeBach, P. &Sundby, R. A. — 1963. competitive displacement between ecological homologues. —Hilgardia, 34, 105–166.Google Scholar
  7. Flanders, S. — 1966. The circumstances of species replacement among parasitic Hymenoptera. —Can. Entomol., 98, 1009–1023.Google Scholar
  8. Riherd, P. T. — 1950. Biological notes onAnagyrus antoninae Timb. [Hymenoptera: Encyrtidae] and its hostAntoninae graminis (Maskell) [Homoptera: Coccidae]. —Fla Entomol., 33, 18–22.Google Scholar
  9. Schuster, M. F. — 1965. Studies on the biology ofDusmetia sangwani [Hymenoptera: Encytidae]. —Ann. Entomol. Soc. Am., 58, 272–275.Google Scholar
  10. Schuster, M. F. & Boling, J. C. — 1971. Biological control of rhodesgrass scale in Texas byNeodusmetia sangwani (Rao): Effectiveness and colonization studies. —Texas Agr. Exp. Stn. Bull., 1104, 15 pp.Google Scholar

Copyright information

© Le François 1976

Authors and Affiliations

  • M. F. Schuster
    • 1
  • H. A. Dean
    • 1
  1. 1.Texas Agricultural Experiment StationWeslacoU.S.A.

Personalised recommendations