I'm an avid orchid grower and a few odds and ends thrown in. I use cinnamon for all cuts and 'rotting' spots or damage spots. Cinnamon will burn orchid roots. I don't care to spray for anything. It just goes everywhere and then there are the airborne particles to contend with. I go with a drench. I use Merit 75, which is expensive but will last me a lifetime. I use it as a drench. 1/8 teaspoon to a gallon of water and drench the soil/medium. Now, I have used it on orchids and hoyas and succulents. But not on anything else. This year, I will be applying it to all my plants which will include the arrow leaf plant, table palms, coffee plant, bird of paradise, and a few others (sorry I have no specific names for my plants). I also relate this as I do not know if there are plants sensitive to this product. I drench by watering the plants medium/soil once a week for three weeks in a row and an extra week if I have mealies. The plants take the product up through their roots and into all parts. The insect bites and takes the toxin into its system and dies. You don't have to worry that you have not 'gotten' all the parts nor do you have to worry about scale on the roots or hidden on the plant. No dripping leaves, or wet walls/floors or airborne particles. All in one place - the soil and IN the plant.

Possibly Colocasia esculenta 'Fontenesii'. Did you know the difference between an Alocasia and a Colocasia is that the Colocasia's leaves point downwards? How about that?

Abutilon theophrasti "Velvetleaf"

Definitely an elm, probably a large-growing one (most are). Fruits are generally needed to positively identify wild species, in addition to those are many intentional hybrids, both old and new - and not fully represented in keys and descriptions. You can't count on someone coming up with a 100% reliable species identification based on seeing this picture on the internet. If it happens to be a comparatively distinctive kind that somebody suggests as a possibility then there you are, otherwise even unusually thorough and dedicated tree expert Arthur Lee Jacobson of Seattle, WA (author of NORTH AMERICAN LANDSCAPE TREES, TREES OF SEATTLE, PURPLELEAF PLUMS) cannot give airtight names to every elm tree he has encountered. And this is includes his home territory, probably the last stronghold (alas, no longer) of elms susceptible to Dutch Elm Disease and pretty much no longer represented by full-sized specimens elsewhere.