Fruit Fly talk by Professor Richard Drew
Fruit flies have spread down to Victoria and now some have been discovered in Auckland.
We used to treat with systemic cover sprays but these are not used very much now and growers now have had to turn to less harmful (to human health) methods. These systemic sprays would be ingested by people eating the sprayed fruit as the insecticide travelled into and through the fruit
Adult Fruit Flies can travel 20 to 90 kilometres to reach fruit targets, this is before they mate.
When they have mated they stay within a reasonably small radius of your backyard.
They feed on proteins that they get from the leaves of the fruit trees, etc. They then take 1 to 1 1/2 weeks to mate and a female can lay up to 1000 eggs. They mate at around dusk on the underside of leaves in the orchard, etc.
Protein bait spays aim to target the Fruit Flies before they have commenced laying. They are an important part of the Fruit Fly eradication programme. Once they have commenced laying the Protein baits will not work.
Ammonia and fruit juice traps are not very successful.
Different traps do different jobs. Traps which are in containers do not work very well, except in trapping males. Open Traps work better than ones in containers.
FRUITION traps were developed at Griffith Uni by Professor Drew
FRUITION traps are a blue orb which are hung in the host tree to attract Qld Fruit Fly but yellow to attract many of the other Fruit Fly Types such as the Cucumber Fruit Fly. The sticky traps attempt to mimic the shape of a fruit. They hang in trees and have an odour sachet which attracts all stages of the male and female flies, even the mature females which lay the eggs. They catch the Fruit Flies by way of sticky surfaces and are not enclosed in any container.. They also catch the Cucumber Flies which attack pumpkins, etc. these look very like the Qld Fruit fly.
A comparison of FRUITION, CERA and BIO traps saw the FRUITION catch 99, the CERA 10, and the BIO 1.
Nets are effective barriers, they do not have to reach down to the ground as Fruit Flies attack from on high.
My own way of dealing with fruit flies is with white vege netting made by NetPro. This is a Qld company based in Stanthorpe. I will be trying the FRUITION traps and will report back on these.
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