If the plant was moved recently from indirect sunlight to direct sunlight, even a couple hours of light through a patio door can cause "sun scorch" which leaves the foliage a washed-out silvery white and usually very dry. A powdery white covering would be powdery mildew which can mean the night temperatures are a little cold. The mildew can be controlled by spraying with a solution of 2 Tablespoons of baking soda in 1 gallon of water.
The solution to your Ficus causing your neighbor's plumbing problems would be for the two of you to split the bill.
Pumpkin leaves could have been eaten by some kind of bug, possibly and most likely an aphid. This is probably why the leaves turned white.
== Some hardwood trees drop sap from their leaves. This acts as a herbicide for smaller plants growing in their shade. An oak, at full maturity can drop 50, 000 gallons of this fluid in a years time and cause white spots on plants like squash, zuchinni, tomatos and other plants.
humidity too low
yes there would be starch in it
how fast it is going
These may be the marks left by leaf miners if they are white and just under the surface. The grub that causes the tunnel will be inside of it somewhere. You can hand squash them or spray with ready made oils for the purpose. Destroy infected leaves.
An infection would cause pitbull to have a swollen eye and filmy white stuff coming out of it.
Ficus trees like part sun and part shade. Also when they are outside you need to make sure that you water them more then you would with them indoors.
The scientific name would be Opuntia ficus-india.
The scientific name would be Opuntia ficus-india.
too much water and or fertilizer,