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Comparative analysis of some parameters affecting maize streak virus (MSV) transmission of various Cicadulina spp. populations

Published online by Cambridge University Press:  19 September 2011

Z. T. Dabrowski
Affiliation:
International Institute of Tropical Agriculture (IITA), P.M.B. 5320, Oyo Road, Ibadan, Nigeria
G. Thottappilly
Affiliation:
International Institute of Tropical Agriculture (IITA), P.M.B. 5320, Oyo Road, Ibadan, Nigeria
H. F. van Emden
Affiliation:
Department of Applied Entomology, University of Reading, Reading RG 2 AT, U.K.
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Abstract

Three populations of C. mbila originating from the rain forest (Ibadan), southern part of sudan savanna (Kadawa, Kano) and the Jos Plateau, and C. triangula population from Ibadan (Moor Plantation) were compared in relation to their ability to acquire and transmit maize streak virus (MSV). Acquisition and transmission efficiency increased with time of access feeding. Joint regression analysis showed that the populations did not differ significantly from each other in transmission efficiency of the virus. Nymphs and adults of some populations acquired MSV in 30 sec and adults transmitted the virus during the 2-hr inoculation access. Efficiency of virus transmission generally increased with acquisition or inoculation time.

The minimum latent period of maize streak virus in the various Cicadulina populations was 14–18 hr and the medium latent period (LP 50) was 16–20hr. Some individuals in all populations retain the virus throughout their lives.

Since the various Cicadulina populations were largely similar in their ability to acquire and transmit the virus into healthy maize, other factors which might be implicated in the epidemiology of maize streak disease are discussed.

Résumé

On procède actuellement à une étude critique des informations diponibles sur la biologie de Cicadulina spp. principalement centrée sur le recours possible à plusieurs espèces pour l'élevage de masse et le criblage en fonction de la résistance du maïs au Virus de la Striure (MSV). L'article qui suit résume les aspects suivants: (a) effet du schéma de dissémination et de la composition de l'espèce sur l'efficacité de la collecte de spécimens vivants en vue de l'éstablissement d'une colonie de base pour l'élevage de masse, (b) effets de la température et de l'humidité sur la biologie et la fécondité des espèces, (c) spécificité des espèces vectrices du MSV, (d) préférence pour le plant-höte et adaptation aux conditions d'élevage de masse. Tous ces paramètres déterminent le choix de diverses espèces de Cicadulina en tant que vecteurs utilisés dans le cadre de la sélection à la résistance au Virus de la Striure du Maïs.

Type
Research Articles
Copyright
Copyright © ICIPE 1987

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