Also consider that the all-white leaves are more sensitive to sun. If you're not seeing any of the green leaves affected, my first guess would be the white leaf got sunburned, which started it shriveling. I don't find that the few Hoyas I grow outside are affected negatively by a lot of rain. Right now, I've got my latifolia out on my back deck - I only put Hoyas out that are struggling or aren't growing because I think the exposure to fresh air and rainwater will "re-boot" them into growing. Well, that plant has not had a dry moment since I put it out there probably 3 or 4 weeks ago, yet it looks better than it EVER has and it's putting out all kinds of new growth. It doesn't get much direct sun, but a lot of dappled sun and, of course, it's nice and bright all day out there. I would do as Mike suggests just in case you've got some fungus or bacteria started. I always cut off dieing or ugly leaves, because they detract from the overall appearance (and health) of the plant. Denise in Omaha

...could just be a bit of fertilizer burn expressing itself at the tip of the leaf. When that occurs in my plants it typically does not spread...just makes the leaf ugly.

The first defoliation was most likely a function of the change in light between where it was sited at school and the lower light area where it is/was at home. It's very possible that the crispy leaf tips/margins are being caused by over-watering, a high level of salts in the soil (from fertilizer and dissolved solids in your tap water), or a combination of both. If your plant is wilting when you can still detect moisture in the soil, it's almost certain that root function is impaired, and the plant 'perking up' as evening approaches supports that thought. Again, this may be the result of an overly water-retentive soil and the lack of air in the root zone that comes with it, or a high level of dissolved solids (salts) in the soil, or both. Even the recurring insect infestation can be resultant of a suppressed metabolism due to poor root health. The fix when your plant wilts while the soil is still moist is less water, not more, and a flushing of the soil to remove excess salts that may be inhibiting water uptake. A high level of salts in the soil can do the same thing to plants that salt does to cured meats, like ham, bacon, summer sausage ..... When the level of salts in the soil is higher than the level of salts in plant or animal cells (meat), the salt actually pulls moisture from cells. When this condition is severe, a condition called plasmolysis can result as cells collapse and plasma is torn from cell walls. Commonly, we call it fertilizer burn. Al PS - it's much more important to shade the container than the foliage. A light colored cache pot filled with an absorbent material you can keep moist (between the 2 pots) or a pot-in-pot arrangement with the outside pot being white or a light color would probably go a long way toward keeping root temps out of the danger zone.

So new development. The already-sprouted babies have started to develop a darker color. They still have patches of their original, bright green color but now they're much duller. Otherwise, they don't seem to be any different. Should I be worried or is this normal?