INTERACTIONS BETWEEN BARLEY YELLOW DWARF VIRUS, APHIDS AND CLADOSPORIUM ON CEREALS
INTERACTIONS BETWEEN BARLEY YELLOW DWARF VIRUS, APHIDS AND CLADOSPORIUM ON CEREALS
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Date
1981-07
Authors
AJAYI, OLUPOMI A.
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Abstract
Field experiments in 1979 revealed that higher
populations of Metopolphium dirhodum (Wlk.) developed
on barley yellow dwarf virus (BYDV)-infected winter wheat
and oats than on healthy plants. More Sitobion avenae (L.)
were similarly recorded in 1980 on BYDV-infected winter
wheat, oats and barley.
In both years, foci of BYDV infection attracted more
immigrant alates than did healthy plants. This observation
was supported by laboratory flight chamber trials in which
aphids were simultaneously presented with a choice of
targets; both M. dirhodum and S. avenae alighted more
frequently on the leaves of BYDV-infected oats and barley
than on those of healthy plants.
The adult size and fecundity of S. avenae were increased
by feeding on BYDV-infected wheat, oats and barley but
M. dirhodum was not affected.
Both BYDV infection and aphid honeydew predisposed
wheat ears to infection by Cladosporium. Individual
M. dirhodum and S. avenae excreted less honeydew on BYDVinfected
than on healthy wheat in the laboratory.
The significance of the interactions between BYDV, its
aphid vectors and C1adosporium is discussed in the light
of the foregoing findings.
Description
Dissertation submitted to the University of London for the
degree of Doctor of Philosopy.
July, 1981
Imperial College of Science and Technology
London
Rothamsted Experimental Station
Harpenden, Herts., Eng1and
Keywords
BARLEY,, DWARF VIRUS,, APHIDS,, CLADOSPORIUM,, CEREALS