STUDIES ON THE UREDINALES OCCURRING IN AND AROUND ZARIA
STUDIES ON THE UREDINALES OCCURRING IN AND AROUND ZARIA
No Thumbnail Available
Date
1984-08
Authors
SEKAR, Vanaja
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
In the present study, which is the first of its kind in northern
Nigeria, an attempt was made to collect as many rusts as possible
from both cultivated crops and wild hosts in and around Zaria, to
identify the hosts as well as the rust organisms.
All the rusts studied except two namely, Puccinia cynodontis
and Ravenclia sp. nov. appeared on their respective hosts in one or
more of the spore forms between the months of June through November.
The two rusts P.. cynodontis and Ravenelia sp. nov. were collected
throughout the year. The highest incidence of both uredinia and
telia was observed during September and October Only.
Thirty four different host plants were observed to be
infected by 30 species of rusts. Among the hoet families collected,
the Gramineae was the most highly infected with 48 % of the total
rusts. In all, 10 families of the hosts were infected by one or
more of the rust organisms.
Out of 30 rust species studied, 15 belonged to the genus
Puccinia, six to Uromyces, two to Ravenelia, one each to Mclampsora
and Phakopsora. Four of them belonged to the form genus Aecidium
and one to Uredo. Five of the 30 rust species identified were
found to be of economic importance and these included Puccinia
substriata var. penicillariae on Pennisetum americanum, Puccinia
sorghi and Puccinia polysora both on Zea mays, Puccinia arachidis on
Arachis hypogea and Uromyces appendiculatus var. appendiculatus on
Vigna unguiculata
V
Out of the 30 species of rusts studied, 24 had uredinia,
21 telia and Tour aecidia. The life cycle of the rust Puccinia
substriata var. penicillariae connecting its graminaceous host
Pennisetum americanum and its aecial host Splanum melongena
( Solanaceae ) was carried out for the first time. The life cycle of
a microcyclie rust, Puccinia hoterospora on Sida urens and S. ova ta
was also completed.
A majority of the rusts collected ( 18 out of 30 ) were new
records for Nigeria, these are Puccinia sp. nov. on Hyparrhenia rufa,
Uredo sp.nov. on Imperata cylindrica, Ravenelia sp. nov. on Albizzia
chav .leiri and Tcphrosia bracteolata, Uromyces sp. nov. on Albuca
sudanica and Aecidium sp. nov. on Moaechma ciliaturn. Rottboelia
exaltata was recorded as new host for Puccinia versicolor. Other new
records for Nigeria were Aecidium jasmini, A. hartwegiae, A.mitrocarpi,
Puccinia cyperi, P„romagnoliana, P. ellisiana, P. oahuensis, p.
eritraeensis, P. versicolor, P. leucadis, and P. laterita.
During the course of the studies, 17 of the rusts collected
were found to be parasitised by the hypcrparasites Darluca filum and one
by Juborculina costaricana The perfect stage of D. filum namely,
Eudarluca australis was found infecting the rust Puccinia polysora.
Description
A thesis submitted to the Postgraduate School,
Ahmadu Bello University, in partial
fulfillment of the requirements
for the degree of
MASTER OF SCIENCE
Department of Biological Sciences
Faculty of Science
Ahmadu Bello University, Zaria
NIGERIA
August, 1984.
Keywords
STUDIES,, UREDINALES,, OCCURRING,, ZARIA