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How Long can Rogued Potato Plants Left in the Field Be a Source of Potato Virus Y for Aphids?

Boquel, Sébastien, Zhang, Jianhua, Nie, Xianzhou
American journal of potato research 2017 v.94 no.1 pp. 81-87
Aphis fabae, Myzus persicae, Potato virus Y, Rhopalosiphum padi, culling (plants), potatoes, seed tubers, stylets
Removal of diseased plants (roguing) is commonly practiced in seed potato production. Diseased plants left to desiccate in fields could possibly serve as sources of Potato virus Y (PVY). PVY acquisition by three aphid species (Myzus persicae, Rhopalosiphum padi, Aphis fabae) was evaluated with leaflets from rogued plants for seven days. Results showed greater PVY acquisition rates in non-colonizing aphids species compared to colonizing ones. The proportion of aphids leaving leaflets increased with time (i.e. days after plants were uprooted) and some aphids were carrying PVY in their stylets on each of the seven days of the experiment, suggesting that aphids were able to probe and acquire PVY even when plants wilted. These results confirmed that diseased plants left in fields can serve as a source of PVY for aphids even after they wilted and emphasises that proper actions must be taken to efficiently remove diseased plants from fields.