On Annona varieties that are commercial here. They are starting to use lights now to tigger flowers, which is better than chemicals, but bad for the environment. Farmers are starting to switch to LED rather than CFL which is good. I find it gard to believe organic dragon fruit farms with ateings of cfl are organic. They break easy and the bulbs are filled with some pretty nasty stuff.
Annona is sprayed mostly for insects. I did some experiments and found controlling ants with boric acid traps cut down on mealy, scale, aphids etc a LOT. Introducing lacewing eggs biweekly killed the rest. This seems the ideal to me. The ants farm various sucking insects and protect them from things like lacewings, ladybugs, predatory mites etc. Kill them, the breeding crasges and introduction of biological pest control is incredibly effective. Its easier, faster and long term as effective.
Herbacides are also used, though many farmers now mow the lawn more like a western orchard, which is good.
If you go anywhere in taidong county and ask anyone, farmer or not, they all laugh and say annona are sprayed very aggressively. Its pretty established unfortunately. They used to be my favorite fruit, now i never eat them. Organic farms do exist though.
Wax apple is a similar situation, people in pingtung also know about the spray but tend to care less. Wax apples are normally wrapped for darkness, given hormones and flowers commence.
The thing.with bagging fruit is 2 fold. 1 is bugs. Most fruit flies. The other that people try to avoid talking about about is they bag the fruit and spray the fuck out of the trees. Its better as it prevents a lot of chemical contamination, but not all. The amount of non recycleable plastic involved with tree fruit bagging is frankly horrifying.much is burned, much is left in piles to be found by future archaeologists.
Just based on spraying, i would guess the top worst ones would be mango, annona, wax apple. Lots of fruit are sprayed but aome specues do fine without.
Ones that should be easy to find organic are pineapple, banana (this industry greatly improved here once Dole showed up and cleaned up the idiocy), dragon fruit.
Some crops are insanely bad for the environment such as watermelon (heavy spray and grown in river beds), cabbage, cuucmbers, tomatoes, almost anything leafy really.
I make my purchases based on a number of things but ir chemicals i pay for organic on things that have numerous nooks.and.crannies are are next to impossible to wash well. Like broccoli, cabbage. Things with peels i am mor lenient on like banana.