Dragon Fruit attack by pest and diseased

Mealybugs and aphids are a common problem for dragon fruit. Aphids is a sap sucking pests feed on thr sweet sap of the plant. Aphids also attracts ants, who will then feed on the plant as well. 

When there is Aphids, then there is also fungus. Fungus damages the vines and also the fruit itself. It is still edible but the fruit sometimes it is not so sweet