STUDIES ON TURCICUM BLIGHT OF SELECTED EARLY AND EXTRA EARLY MAIZE (Zea mays L.) LINES INDUCED BY Helminthosporium turcicum Pass IN ZARIA
STUDIES ON TURCICUM BLIGHT OF SELECTED EARLY AND EXTRA EARLY MAIZE (Zea mays L.) LINES INDUCED BY Helminthosporium turcicum Pass IN ZARIA
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Date
2003-10
Authors
OMO-EBOH, MAMUDU ERAGBAI
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Abstract
During the 1997 and 1998 cropping seasons, studies on turcicum blight of maize
(Zea mays L.) induced by Helminthosporium turcicum Pass were carried out in
Zaria using selected early and extra-early maize lines. The pathogenicity test
carried out in the glass house confirmed Helminthosporium turcicum as the
causative agent of the disease.
Field and glasshouse screening of fifteen early and eleven extra-early maize
lines for their resistance to turcicum blight was conducted in 1997 and 1998.
Seven early lines (AK 9331-DMSR, SynE2, ACR 92TZE Comp. 5-W, Dorke-SR,
Farakoba 90 pool 16DT (HD), NAES pool 16DT, DT-E-Y SR) and five extra-early
lines, TZE-W-SRBC5, CSP-SRBC5, KEB, TZEF-Y-SR, 95.TZEE-W1 were
moderately resistant while CSP x local Raytiri, CSP-SR x TZEE-Y among the
extra-early lines and AB 11, Kamboinse 88 Pool 16DT RE among the early lines
were moderately susceptible.
Sowing date trials at 14-day intervals were conducted in 1997 and 1998 using
early line AB 11 and extra-early line CSP-SR x TZEE-Y. The sowing dates were
June 26, July 10, July 24 and August 7 in 1997; June 29, July 13, July 27 and
August 10 in 1998. In both lines, disease incidences were recorded at 30, 45
and 60 days after sowing (DAS) while severity were recorded at 50, 60 and 70
(DAS). The maximum disease severity (12.71 % and 26. 04%) was recorded on
early maize lines planted on July 24 and 27 (i.e. third sowing date) in 1997 and
1998 respectively. The highest grain yields in both years (1997 and 1998)
(2592.6kg/ha and 1592.6kg/ha) respectively were recorded on maize planted on
June 26 and 29 (i.e., first sowing date) that were least affected with turcicum
blight. For the extra – early lines, the maximum disease severity (9.68% and
38.34%) were recorded on maize planted in July 24 and 27 in 1997 and 1998
respectively. Least severity (7.61% and 17.08%) was recorded on maize planted
on June 26 and 29 in both years with subsequent significantly (p= 0.05) highest
yield (2555.6 kg/ha) in 1997.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL, AHMADU
BELLO UNIVERSITY, ZARIA
IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF
MASTER OF SCIENCE IN CROP PROTECTION
DEPARTMENT OF CROP PROTECTION
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY
ZARIA, NIGERIA.
Keywords
STUDIES,, TURCICUM,, BLIGHT,, SELECTED,, EARLY,, EXTRA,, EARLY MAIZE,, LINES INDUCED,, Helminthosporium,, turcicum Pass,, ZARIA