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BOTRYTIS



Botrytis brown rot of single berries
Botrytis brown rot of single berries
Photo credit: Peter Magarey
Look For Look For Notes

   LOOK FOR

    Look for in shoots
  • Patches of soft brown rot on young stems

    Look for in leaves
  • V-shaped brown areas (with a yellow margin) between the main veins
  • Circular brown areas where physical damage has occurred

    Look for in bunches
  • Small brown spots with ‘slip’ skin on soft berries
  • Buff-grey spore masses where skin has cracked after damage or periods of high humidity
  • Bunches with grey, mouldy growth

   CONDITIONS

  • Spreads rapidly in moist periods especially once the berries soften near harvest
  • Because it is difficult to see Botrytis in flowers or young bunches, use the 'bag test'. Store bags for 5-7 days, then look for the characteristic grey mould.
  • Varieties with thin-skinned berries and/or tight bunches are the most susceptible.
  • Young leaves, bunches and shoots recently damaged by lightbrown apple moth (or other insects), by wind or rain splitting, or by cultural operations, are more likely to become infected.

OTHER BOTRYTIS IMAGES

Botrytis rots young stems especially after they have been damaged by hail Botrytis causes V-shaped regions on leaves Botrytis rots infect leaves in wet conditions Infected flower parts spread disease Typically, Botrytis develops from cracks in the berries Buff-coloured spores of Botrytis grow from rotted berries Typical bunch rot Bunch rot is increased by insect damage

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