Effect of mineral oil on Potato virus Y acquisition by Rhopalosiphum padi |
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Authors: | Sébastien Boquel Marie‐Andrée Giguère Catherine Clark Upeksha Nanayakkara Jianhua Zhang Yvan Pelletier |
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Affiliation: | 1. Comité Nord ‐ Semences, Innovation, Protection, Recherche, Environnement (SIPRE), , Achicourt, 62217 France;2. Department of Biology, University of New Brunswick, , Fredericton, NB, Canada, E3B 5A3;3. Potato Research Centre, Agriculture and Agri‐Food Canada, , Fredericton, NB, Canada, E3B 4Z7 |
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Abstract: | Seed potato crops are currently sprayed weekly with mineral oil to prevent transmission of the Potato virus Y (PVY; Potyviridae: Potyvirus), one of the most prevalent and important non‐persistent viruses affecting potato production. In spite of its wide usage as inhibitor of virus transmission, the mode of action for mineral oil is poorly known. The objective of this study was to quantify the effect of dosage and time from application of mineral oil on the inhibition of PVY acquisition. The bird cherry‐oat aphid, Rhopalosiphum padi (L.) (Hemiptera: Aphididae), known as vector of PVY, was used in all the experiments. The results indicated that mineral oil efficiently decreased PVY acquisition by 75 and 70% 1 day after application of 5 and 10 l ha?1, respectively. The inhibition effect decreased with time from application; mineral oil inhibits acquisition for less than 4 days at 5 l ha?1 and between 8 and 12 days at 10 l ha?1. As mineral oil was detected in the body of fewer aphids when they fed on plants 1 day after oil application, a change in the aphid probing behaviour on mineral oil‐treated plants was deduced. These results support the hypothesis that mineral oil physically inhibits the binding of the virus at the tip of the stylets. |
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Keywords: | virus‐vector interaction crop protection aphids potato non‐persistent virus virus detection Potyviridae
PVY
Hemiptera Aphididae bird cherry‐oat aphid |
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