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Temporal Changes in the Dispersion of Populations of Three Homopterous Insect Pests of Upland Cotton

  • Joginder Singh
  • Z. S. Dhaliwal
  • S. S. Sandhu
  • A. S. Sidhu
Research Article

Abstract

Spatial pattern of distribution of populations of three insect species, namely, Amrasca biguttula biguttula (Ishida), Bemisia tabaci (Genn.) and Aphis gossypii Glov. was studied in Upland cotton (Gossypium hirsutum L.) at an interval of 13–15 days during July, August and September in Punjab. The populations were found to be aggregated from the beginning of season upto 25 August in jassid nymphs, 12 August in whitefly adults and the end of season in apterous aphids. Environmental heterogeneity at low population in July and innate behaviour at high population were responsible for the aggregated dispersion in each of the three homopterans. Based on these observations the appropriate number of samples required to be drawn for population studies were determined which varied with change in pest density in each case.

Key Words

Dispersion Amrasca biguttula biguttula Bemisia tabaci Aphis gossypii cotton 

Résumé

La distribution de la population de 3 especes d’insectes, Amrasca biguttula biguttula (Ishida), Bemisia tabaci (Genn.) and Aphis gossypii Glov. fut analysée sur le coton (Gossypium hirsutum L.) durant un intervalle de 13 à 15 jours pendant le mois de Juillet, Aout et Septembre au Punjab. Les populations etaient aggregées du debut de la saison au 25 Aout pour les chrysalides, au 12 Aout pour les adultes et a la fin de la saison pour les aphides sans ailes. L’heterogènite de l’environnement pour la population au bas niveau au mois de Juillet et le comportement inné pour les populations au niveau elèvé furent responsable de l’aggregation dispersee de chaque groupe d’hemiptères. Se basant sur ces observations, le nombre approprié qu’on necessite pour l’analyse fut determine dans chaque cas ou il y a un changement dans la densite des ravageurs.

Mots Clefs

Dispersion Amrasca biguttula biguttula Bemisia tabaci Aphis gossypii coton 

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References

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Copyright information

© ICIPE-ICIPE Science Press 1990

Authors and Affiliations

  • Joginder Singh
    • 1
  • Z. S. Dhaliwal
    • 1
  • S. S. Sandhu
    • 1
  • A. S. Sidhu
    • 1
  1. 1.Department of EntomologyPunjab Agricultural UniversityLudhianaIndia

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