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Control of insect transmitted virus diseases in cereals and sugar beet.
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2000-12-01
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Kennedy, T.F., Connery, J., Control of insect transmitted virus diseases in cereals and sugar beet, End of Project Report, Teagasc, 2000.
Abstract
The objective of this investigation was to determine if, in a mild autumn when aphid
numbers were high, the recommended aphicide treatments derived from earlier trial
results were adequate to control BYDV in autumn-sown barley. Investigations on spring barley at Oak Park, 1990-1993, showed Barley Yellow
Dwarf Virus (BYDV) can cause reductions in grain yield of up to 1.4 t/ha. These
studies indicated that the risk of infection increased with lateness of sowing date.
They also suggested that control of the disease might best be obtained by applying an
aphicide at the 4-leaf stage of growth.
The objectives of this investigation were to determine the growth stage at which
aphicide should be applied in order to obtain best control of BYDV and to compare
the effectiveness of systemic and contact aphicides in controlling the disease.Aphid numbers, species and infectivity with virus yellows were monitored in 20 beet
crops between May and July over the period 1990-1999. Monitoring was undertaken
to provide growers with an aphid-spray warning in order to minimise the risk of virus yellows and to establish aphid-thresholds which if exceeded would necessitate the spraying of crops with insecticide.