Sydney NSW, Australia
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Mango industry discovers highly infectious bacteria as cause of ugly veins of resin canal discolouration
ABC New Rural 

Scientists have worked out what causes ugly veins to appear in mangoes — a breakthrough that could save the industry millions of dollars each year.

Key points:

  • RCD-infected mangoes are safe to eat, but the blemishes and discolouration makes the fruit unsaleable
  • Scientists found RCD spread simply by touching the surface of infected fruit and unaffected mangoes
  • Now known to be spread as a bacteria, it makes it easier to target what control measures are needed

Described for decades as a mystery disorder, resin canal discolouration (RCD) causes bizarre veins to emerge within the mango flesh.

Affected mangoes are safe to eat, but the blemishes and discolouration caused by RCD makes the fruit basically unsaleable.

It is now known that RCD is caused by a bacterial infection and can be easily spread.

"When we started doing trials we were initially thinking it would be quite difficult to spread," said research leader Dr Cameron McConchie.

"Prior to this research we were in a situation where people were saying RCD was maybe caused by temperature changes or a change in fertiliser.

"But now we know it's a bacteria it makes it much easier for everyone to target what the likely control measures are."

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