Hello and welcome to the forum. I live in Panama which also has a tropical climate and I grow a lot of chili's. I also have issues occasionally with white fly's. I usually don't experience them during the rainy season which I am in now. Or, if I do experience them during the rainy season, they aren't as bad of a problem. Its the rainy season now and yes, I am seeing white fly on my plants. I do not have any good news to share with about this problem. They are extremely difficult to control if not impossible. I have some very large, older super-hot peppers that are infected with white fly. Its a waste of time to spray for them. I trim off the branches that are infested. Its best to burn the branches. But, trimming the branches doesn't really help much. I am waiting to kill the plants so I can pick most of the peppers after they ripen. In a week or two, I will euthanize the plants. There isn't really any solution. If I wait too long, white fly's will spread to the other plants. Once they are in the other plants you need to euthanize them as well. Inspect the plants frequently. Kill the plants that are infested. Inspect your yard also. White fly's can live in weeds if there is no other suitable host. Keep all the weeds trimmed back if you see them swarming in the weeds. I really have no advice other than this. White fly's are a disaster. Now, the good news is that you live in the tropics where chili's are quite easy to grow. Make sure you save plenty of seed so you can replant later. Generally, white fly's do not really like wet weather. They like the dry season. But, they can be seen year round in your climate. Don't waste time on expensive cures. I don't believe a satisfactory cure exists. White fly's are part of the hobby depending on where you live. We have to learn to live with them. They are the worst I know.