International Journal of Tropical Insect Science

, Volume 6, Issue 6, pp 661–665 | Cite as

Dispersion Patterns, Sample Unit-Sizes and Techniques for Sampling Cotton Jassid [Amrasca biguttula biguttula (Ishida)] and Whitefly (Bemisia tabaci, Genn.)

  • A. K. Chakravarthy
  • P. K. Ananda Rao


Spatial dispersion of the nymphs of the jassid, Amrasca biguttula biguttula (Ishida), and the adults of the whitefly, Bemisia tabaci Genn. on F414, a Gossypium hirsutum variety, was systematic in Ludhiana (Punjab). Both the jassid and the whitefly displayed no definite pattern along the height of the plant, though a maximum number of whiteflies were recorded at middle canopy (21–40 cm from bottom). Sample sizes of 10–15 plants, selected in a statistically linear fashion represented populations of jassid nymphs and adult whitefly on all four varieties. Sampling jassid nymphs by visual counting and whitefly by split-cage were the most suitable sampling methods for local cotton growers among the various methods compared.

Key Words

Spatial dispersion sample size sampling method cotton jassid whitefly 


La distribution spatiale des nymphes jassids Amrasca biguttula biguttula (Ishida) et le whitefly adult Bemisia tabaci, Genn.) sur la variété F414, a hirsutum était uniforme a Ludhiana (Punjab). Le jaseis aussi bien que le whitefly ne manifestaient anoun échantillon le long de la hauteur de la plantes bien que. Un maximum nombre de whiteflies ont été remarques au dalis central (21–40 cm du bas). Des échantillons de 10–15 plantes, sélectionnés d’une façon liveaive, représentaient statistiquement des populations des nymphes jassids et whitefly adult surtoutes les quatre variétés. Le chantionnage des nymphes jassids en les comptant visuellement et des whiteflies par “split-cage” était le plus convenable pour les cultivateur du coton a Ludhiana parmi les méthodes comparées.


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Copyright information

© ICIPE 1985

Authors and Affiliations

  • A. K. Chakravarthy
    • 1
    • 2
  • P. K. Ananda Rao
    • 1
  1. 1.Departments of Entomology and Plant BreedingPunjab Agricultural UniversityLudhianaIndia
  2. 2.Regional Research StationMudigereIndia

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