Potato Mop-Top Virus in­cur­sion

Potato Mop-Top Virus (PMTV) was found in New Zealand in Septem­ber and Biose­cu­rity New Zealand, part of the Min­istry for Pri­mary In­dus­tries (MPI), is work­ing in part­ner­ship with Po­ta­toes New Zealand to help man­age the virus.

NZ Grower - - Potatoesnz Inc. -

PMTV is a plant virus that largely af­fects po­ta­toes and is a no­ti­fi­able and un­wanted or­gan­ism in New Zealand un­der the Biose­cu­rity Act.It is not a food safety is­sue and peo­ple can trust the po­ta­toes they eat.

The virus is trans­mit­ted by the soil­borne fun­gus which causes pow­dery scab (Spon­gospora sub­ter­ranean), and can only sur­vive long-term in the potato plant or in the fun­gus.

Once es­tab­lished in fields, the virus can sur­vive in the fun­gus for up to 20 years in soil in the ab­sence of a potato crop. The in­fec­tion of the potato plant can be ei­ther di­rectly from the in­fected mother tu­ber or through a cur­rent sea­son trans­mis­sion via a pow­dery scab in­fec­tion of the roots. Trans­mis­sion can oc­cur via me­chan­i­cal or soil trans­fer­ence so farm biose­cu­rity is im­per­a­tive at this time. Grow­ers will be in­formed by MPI of man­age­ment steps in re­gards to con­tain­ment.

If es­tab­lished in NZ PMTV would be a man­age­able dis­ease. It is es­tab­lished in North Amer­ica and Europe where it is gen­er­ally man­aged ef­fec­tively with­out caus­ing ma­jor pro­duc­tion losses. How­ever, where it is poorly man­aged it can cre­ate pro­duc­tion prob­lems for potato grow­ers.

Af­fected po­ta­toes can dis­play both fo­liar and tu­ber symp­toms of vary­ing sever­ity depend­ing on the sen­si­tiv­ity of the va­ri­ety and the source of in­fec­tion, in­clud­ing;

• Dis­tor­tions to the skin.

• Deep crack­ing, and rust-coloured arcs, streaks or flecks in the tu­ber flesh. • Yel­low coloura­tion on the fo­liar (mother tu­ber in­fec­tions, as seen in photo one above).

While some va­ri­eties may show symp­toms on the skin – PMTV may not be de­tected un­til the tu­ber is cut open. Some po­ta­toes, while in­fected, may not show any symp­toms at all, as in photo two above.

Grow­ers have an im­por­tant role to play in pro­tect­ing their farms, their re­gion and the potato in­dus­try from biose­cu­rity threats.

If you sus­pect you have found PMTV on your prop­erty, con­tact the Biose­cu­rity New Zealand Pests and Dis­eases hot­line: 0800 80 99 66.

Help con­trol the spread of PMTV by main­tain­ing strict hy­giene prac­tices on your farms.

Newspapers in English

Newspapers from New Zealand

© PressReader. All rights reserved.