Those 'brown nodules' are the reason that the ants are patrolling your citrus. You have a mighty fine infestation of scale insects.

We really can't tell what has been making the holes in your snail vine. Check for critters in the early morning or evening hours.

Thanks for the feedback. Can anyone suggest what might be eating those holes? Or comment on the white blotches found on the plumeria?

Thanks rizo. Checked plants at night to find slugs and cutworms both.

The ants are there helping you control the problem you have, they are not the "pest" many people think they are. Those "brown nodules" look like scale, something a superior oil spray is usually the means of control used for them. Test any oil spray before doing a general spray since some plants are more susceptible to the affect of oil than others.