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Welcome to the Bunnings Workshop community @zotz87. It's fantastic to have you join us, and many thanks for your question.
It would appear that the likely culprits are either codling moth or fruit fly. Codling moths don't like clean trees and gardens, so remove all the debris from around your tree and any that gets stuck in the fork of branches. You can use Yates 200ml Success Ultra Insect Control or Yates 40g Natures Way Caterpillar Killer Dipel Insecticide to kill the larvae, so you'll need to spray before and during the development of the fruit. If you wrap corrugated cardboard around the tree's trunk leading up to fruiting, the larvae like to pupate and sheltered within it. Every couple of weeks, remove the cardboard and place it in a plastic bag left in the sun to kill the larvae.
For fruit flies, you can hang Amgrow Cera Trap 600ml Organic Fruit Fly Traps.
Let me mention our expert horticulturists @Noelle and @Adam_W, to see if they have some advice.
Please let me know if you have questions.
Mitchell
Hello @zotz87
Welcome to Bunnings Workshop. These are good suggestions from @MitchellMc and @Noelle my other suggestion is more labor intensive but will protect your fruit with no chemicals involved. Once the tree has flowered and the fruit has started to come out once they are the size of 20C coins use a zip lock bag on every fruit you can cover. It is a well practiced form of protection in Japanese farming and it has been used for hundreds of years before the introduction of chemical control. Using a sandwich sized bag cut a little bit of the bottom corners of the bag at a 45 degree angle. This will allow trapped moisture to escape and not rot the fruit. Simply press the locking seal until you reach the stem you then use tape at the ends near the stem to prevent the bag from opening in strong wind or rain. Keep an eye as the fruit grows as some will fall prey to worms that have already laid their eggs in the young fruit. It is an alternative if you are very sensitive to chemical sprays or inorganic chemicals that may have seeped in to the fruit. Either way will stop the worms and you get to enjoy your quince!
Cheers,
Red
Credit to : https://www.theimpatientgardener.com/bag-it-up-how-to-protect-fruit-from/
I am a Bunnings team member. Any opinions or recommendations shared here are my own and do not necessarily represent those of Bunnings. Visit the Bunnings website for assistance from the customer service team.
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