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Psa symptoms herald spring season change

Psa symptoms herald spring season change

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27 Oct 21 Biosecurity News

Psa symptoms herald spring season change

KVH has to date received two reports of Psa exudate symptoms, one for a previously undetected orchard and the other for a young Gold3 block. Early varieties are now beginning to break bud and growers are recommended to begin monitoring areas more prone to Psa, to build an understanding of where risk may lie this season. Focus on more vulnerable young plants and take care to protect these with directed spray programmes and good frost protection.

If ground conditions have limited the opportunity to apply sprays through winter, now is the time to apply copper at winter rates, ensuring a one-week window is maintained between bud enhancing spays and copper. Research has shown Psa can be present under bud scales as well as on the surface of buds so protection through the bud-break period is key to providing a strong start to the spring programme.

Where pruning gangs are still at work an emphasis on tool hygiene is also recommended.

If Psa-like symptoms are seen for the first time on your orchard report these to KVH on 0800 665 825. Growers can also contact their packhouse technical representative for advice and sample collection if required.

Hill Laboratories carry out routine Psa testing weekly on Wednesdays.


KVH investigates reports of unusual symptoms to identify and manage any biosecurity risks.

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