Hi everyone, I'm new here... :) I have a question regarding a plant that my dad is trying to cultivate. The plant's name is Hylocereus Undatus, also often referred to as Dragon Fruit or Red Pitaya. My dad is trying to grow this in Indonesia. It is a tropical country with lots of humidity and full sun. (Temperature range is well above 25 C/ 77F) There are only dry and wet season in the country. Since it's a species of the Cactaceae genus, it wouldn't be able to stand too much water. We have approximately 2 acres of land in which these plants are growing. However, the plants, for some reason, constantly get this fungi infection that look like the attached pictures. Is there any cost-efficient way to get rid of this fungi infection? I've read that Abamectin, Benomyl and Maconzeb may take care of the problem but I wasn't sure if it was cost-efficient. Also, can the fungi possibly be due to too much water being absorbed by the plants? We have been trying to cultivate this plant for about 6 months now but it has never been fully successful. So far, we have only experienced dry season and the fungi is there. Now that it's turning to be a wet season, the fungi seems to be infecting more plants. How do we get rid of this problem? Thanks!