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The effect of drought stress and temperature on spread of barley yellow dwarf virus (BYDV)

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1 The effect of drought stress and temperature on the dispersal of wingless aphids Rhopalosiphum padi (L.) and the pattern of spread of BYDV (barley yellow dwarf virus) within wheat plants in controlled environment chambers was quantified. Combinations of three different drought stress levels, unstressed, moderate and high stress level, and three different temperatures, 5 ± 1 °C, 10 ± 1 °C, and 15 ± 1 °C, were investigated.

2 With increased temperature there was an increase in the mean distance of visited plants from the point of release and in the number of plants visited and infected with BYDV. Drought stress had no effect on mean distance moved by aphids at any temperature or on plants infected with virus at 10 °C and 5 °C. When plants were drought stressed, the numbers of plants visited and infected were greater at 15 °C than at 10 °C and 5 °C.

3 A greater proportion of plants visited by aphids was infected with BYDV when plants were stressed than when not stressed. At 15 °C a greater proportion of these plants was infected than at lower temperatures. There was no difference between treatments in the numbers of aphids present at the end of the experiment.

4 It is concluded that drought stress and temperature are of considerable importance in virus spread.
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Keywords: BYDV; Rhopalosiphum padi; drought stress; temperature; virus epide- miology; virus spread

Document Type: Research Article

Affiliations: 1: Department of Entomology and Nematology, and 2: Aristotle University, Faculty of Agriculture, 540 06 Thessaloniki, Greece 3: Statistics, IACR-Rothamsted, Harpenden, Herts AL5 2JQ, U.K. and

Publication date: 2000-08-01

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