Factors Influencing Transmission of Didymella rabiei (Ascochyta Blight) from Inoculated Seed of Chickpea Under Controlled Conditions |
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Authors: | R B E Kimber E S Scott M D Ramsey |
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Institution: | (1) Discipline of Plant and Pest Science, The University of Adelaide, Waite Campus, SA 5064 Glen Osmond, Australia;(2) South Australian Research and Development Institute (SARDI), GPO 397, SA 5001 Adelaide, Australia;(3) Animal and Plant Control Commission, GPO 2834, SA 5001 Adelaide, Australia |
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Abstract: | Ascochyta blight of chickpea (Cicer arietinum), caused by the fungus Didymella rabiei, has the potential to cause 100% crop loss in severe epiphytotics. Management of this disease often involves reducing sources
of inoculum. The influence of sowing depth, host resistance, seed infection level and soil temperature on disease transmission
was investigated in a series of glasshouse and growth room trials using seed artificially inoculated with D. rabiei. A positive correlation (R2=0.9992) was observed between rate of seed infection and the incidence of disease on seedlings. Disease transmission to seedlings
was not significantly influenced by sowing depth (1, 3 and 6 cm) in separate trials on two cultivars. Susceptibility of the
host showed no obvious influence on the frequency of disease transmission in two trials conducted using four cultivars ranging
from highly susceptible to moderately susceptible/moderately resistant. Trials conducted in controlled conditions showed that
there was no obvious relationship between soil temperature (5, 9, 14 and 19 °C) and the incidence of disease on seedlings. |
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Keywords: | Ascochyta rabiei gram blight |
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