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Distribution (Phytophthora)

Both P. cactorum and P. syringae are responsible for fruit rot. P. cactorum is often responsible for rotting of fruit in summer and in warm climates, being favoured by warmer temperatures. P. syringae generally causes rotting in northern apple growing …

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Symptoms and recognition (Phytophthora)

Phytophthora rot appears in the orchard and in store and symptoms are similar.  Symptoms vary according to the variety.  The rot is usually firm and the skin easily peeled away. Cox – A firm rot ranging in colour from pale green to mid-brown often with a …

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Other rots that may be confused with Phytophthora rot

Phytophthora rot is usually readily distinguishable on Cox and Bramley but on Gala, Jonagold and Egremont Russet may be easily confused with brown rot ( Monilinia fructigena ). Differences may only be distinguishable by a specialist and may require …

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Disease cycle and epidemiology (phytophthora)

Both P. syringae and P. cactorum are generally widespread in apple orchard soils. They overwinter as resting spores (zoospores) which are formed in fallen apple fruits and leaves and released onto soil when these rot. P. syringae is active at mean air …

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Disease monitoring and forecasting (Phytophthora)

No forecasting methods have been developed for Phytophthora fruit rot.  However, the risk of rotting in store due to Phytophthora can be assessed pre-harvest based on orchard rot history, the amount of bare ground in the orchard, % crop <½ metre (knee …

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Cultural control (Phytophthora)

Throw dropped fruit into alleyway and macerate to encourage rapid rotting. Apply 5% urea spray prior to leaf fall and after leaf fall macerate up leaves in the orchard to encourage rapid breakdown and reduce the risk of colonisation by Phytophthora . …

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Chemical control (Phytophthora)

Pre-harvest In orchards at risk from Phytophthora rot, particularly where orchard rot history has indicated a significant incidence of Phytophthora rot in store following a wet harvest, two fungicide sprays of captan or Bellis (pyraclostrobin + boscalid) …

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