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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730 EISSN: 1021-9730
Vol. 5, No. 2, 1997, pp. 189-195
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Bioline Code: cs97024
Full paper language: English
Document type: Research Article
Document available free of charge
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African Crop Science Journal, Vol. 5, No. 2, 1997, pp. 189-195
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The determination of when maize plants were infected with maize streak virus from the position of the lowest diseased leaf
Gibson, R.W. & Page, W.W.
Abstract
Maize plants cv Kawanda Composite A growing in soil in a screenhouse and
ranging in age from 1 - 9 weeks were inoculated with maize streak
geminivirus (MSV) using viruliferous Cicadulina mbila adults caged
either in groups of two or five per plant on top, middle or bottom leaves
in order to determine whether a consistent relationship is present between
symptom development and plant age. Symptoms generally developed first on
the leaf emerging at the time of inoculation or, for older plants, on the
leaf directly below. Leaves which had already emerged did not subsequently
develop symptoms, so the lowermost leaf with symptoms indicated the growth
stage at which a plant was infected. This relationship allows the stages
at which different plants in maize crops were infected with MSV to be
determined from just a few surveys, so facilitating epidemiological studies
at sites which can be monitored only infrequently, such as distant ones or
farmers' fields.
Keywords
Cicadulina mbila, Kawanda Composite A, MSV, symptoms
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fr |
Gibson, R.W. & Page, W.W.
Résumé
Les plantes de mais du cultivar Kawanda Composite A plantes en sol dans une
serre, variant de 1 a 9 semaines d'age ont ete inocules avec la "streak"
geminivirose du mais en utilisant des adultes virulents de Cicadulina
mbila en cage en groupe de deux ou de cinq par plante, au sommet, au
centre ou bien a la base foliaire. Generalement, les symptomes se sont
developpes en premier sur la feuille qui a emerge au moment de
l'inoculation ou sur la feuille directement en dessous de la precedente
pour les plantes plus agees. Les feuilles qui avaient deja emerge n'ont
pas developpe de symptmes, ainsi la feuille plus a la base avec symptmes
a indique le stade de croissance a laquelle la plante a ete infectee. Ceci
permet ainsi la determination, avec quelque peu d'enquetes, des stades
auxquelles les plantes de culture de mais auraient ete infectes avec la
virose du mais, devenant ainsi une methode appropriee pour l'etude de
l'epidemiologie de la maladie en champs des fermiers ou pour des sites
lointains.
Mots Clés
Cicadulina mbila, Kawanda Composite A, MSV, symptomes
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© Copyright 1997 - African Crop Science Society
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