Easy as to fix man, buy this
https://www.ebay.com.au/itm/Vege-Net-6m-x-10m-Fruit-fly-Insect-exclusion-/272076144011
And a pack of cable ties, I grow all my own fruit and veg as well as weed and use this net for everything in summer. It can stop all bugs, even nats and fruit fly but won't trap...