GLASSHOUSE STUDIES ON THE RESISTANCE OF SOME ANCIENT WHEAT VARIETIES TO CEREAL APHIDS
GLASSHOUSE STUDIES ON THE RESISTANCE OF SOME ANCIENT WHEAT VARIETIES TO CEREAL APHIDS
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Date
1984
Authors
AKINFENWA, S.
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Abstract
Studies on the resistance of wheat to two cereal aphids (Sitobion avenae
and Metopolophium dirhodum) were carried out in the glasshouse using some
ancient wheats (Einkorn, Emmer and Spelt) as well as some modern wheat
varieties (Bounty, Highbury, Mardler and Maris Kinsman).
The diploid ancient wheat Einkorn was the least preferred by both cereal
aphids and both aphids were also least fecund on this wheat. Infestation
by S. avenae led to least reduction in the growth of Einkorn of the wheat
varieties studied while infestation by M. dirhodum led to a moderate
reduction in the growth of this same wheat. S. avenae spent a short time
on this wheat and a small proportion of the time was spent feeding; most
of the time was spent wandering. In contrast with modern varieties, the
mode of infestation of the ear of Einkorn by S. avenae did not follow any
definite pattern. This ancient wheat was also the least affected by mildew.
Einkorn has clearly shown a high level of resistance to both cereal aphids
exhibiting two components of resistance (antibiosis and preference).
The ancient wheat Emmer (susceptible to M. dirhodum) and the hexaploid
modern wheats Highbury and Mardler seem to show partial resistance to both
cereal aphids but the primitive hexaploid wheat Spelt was very susceptible
to both S. avenae and M. dirhodum.
This study has shown that some ancient wheats are potential genetic sources
for the control of cereal aphids but that others may be as susceptible as
modern varieties. In this study, at least one of the ancient wheats (Spelt)
was as susceptible as the modern Maris Kinsman.
Description
A Dissertation Submitted for the Degree of
DOCTOR OF PHILOSOPHY
at the University of Reading
Department of Zoology
University of Reading
1984
Keywords
GLASSHOUSE,, RESISTANCE,, ANCIENT,, VARIETIES,, CEREAL APHIDS