There are organic bananas, but I agree with Tom, it is hard to avoid non-organic stuff. Even the NOP standards acknowledge that and have allowed synthetics on their lists. If you use organic fertilizers like fish meal, bone meal, blood meal, feather meal and composts, there are probably something synthetic that went in them. Fish food for farmed fish is not organic, but allowed because there is no practical substitute. Even if you eat a wild caught salmon, those fish are now swimming in polluted waters. Look at all the tuna with high levels of mecury.
90% of the corn, soybeans, canola, and wheat are gmo. And most of the corn is grown as animal feed for cattle, pigs, and chickens. It is hard to avoid synthetically grown products at the store. It is in everything from cereal and bread, to meatloaf, and tomatoes.
As to bone meal, blood meal and other animal by products, I try to avoid them. Rendering plants are not sent food grade animals, they get the old, the sick and the left overs.
Mad cow disease that was diagnosed in humans as Creutzfeldt Jacobson disease is a prion disease and the people with the highest risk were those who ate organ meats and vegetarian farmers who used and probably inhaled bone meal made from animals that were fed sheep brains. The risk is very low and no one is legally allowed to feed sheep brains or even bone meal to ruminents anymore, but the disease does occur naturally but takes years (over 10) to show up, that is why it usually shows up in dairy cattle who are usually sent to rendering plants not meat packers. The disease is usually not diagnosed until it is in its later stages and is 100% fatal.
BTW while it is not allowed to feed brain and spinal chords to ruminants, they are still allowed to feed it to other animals like pigs. Pigs are usually slaughtered when they are only a few months old, so they do not get the disease.
Happy gardening in Hawaii. Gardens are where people grow.