Hi Krolik, How's your plant doing? Here are a couple of thoughts. 1, Travel can be stressful for plants, they can pick up exposure to who knows what. 2, Bathroom humidity, It may not dry out enough, in there, to kill unwanted organisms, or let the plant cells move water. Consider moving the plant out of there for a few days, or a couple of weeks. Just give it a light morning spritz in it's new home. A flor. plant light -10$ and timer -8$ if the light needs adjusting+ a little, somewhere else. 3, Light anti-fungals/microbials, Neem oil from Logee's, that stuff is good! Meanwhile, have you tried watering with a little green tea, or black tea or coffee that's been thinned, or a spray of water and white vinegar, say from 1/10th to 1/3rd vinegar? And there's lysol spray, or other similar cheap substitute [saw that in gardenweb, just don't remember if it was on begonias]. My begonias perk up with the vinegar spray. One liked half cup of old coffee in its quart+ watering pot too. 4, Soil changes/repot.I had an ailing Sophie Cecile, one I had growing on from cuttings. I took a chance with it, because I didn't want to throw it out. I repotted it, down a little, because of fewer roots, with a little good soil from the yard. The soil had a little clay, a tiny bit of wood ash, some peaty compost, and maybe a little dog residue. They are supposed to like a little clay, and potash is good for fighting ills, and the texture was open from the plant material. It turns out that there's something in dung preferably cow, that helps fight off some virus or fungus or other. It was happy at the end of the summer,when it came out from under a shrub. I'm hoping that you can hold out till spring when you can set it in a protected spot.

Those plants look healthy, and it's normal to lose a few leaves after a repot. Look up plant edema and see if you think that may be going on. I use a chunky mix also but still get that on some leaves periodically. Fluctuations in temp outside are impossible to control, and a lot of them are out where they get rained on. I remove those leaves and don't become alarmed unless leaves are being lost at a rapid rate (or there just aren't many to spare to begin with.)

Are these older leaves from the bottom of the plant or new top growth? If older leaves it could just be natural death of the lower leaves as always happens. Otherwise given all the yellowing, likely some over-watering, perhaps some nutrient deficiency, even some early blight. Your location/zone info on your post would help as it would at least give us a hint as to old the plants are and what your weather has been like - all of which contribute to problems. Also need to know if they are in containers or in the ground? Dave

Again................perhaps location has a something to do with it, but I find that mine do best when I follow BGI's suggestions............ Fertilizer: A water soluble fertilizer is best for giving your plants the nutrients that they need. The slow release long lasting fertilizers do not release the fertilizer fast enough or in a large enough quantity to benefit the plant. I have had good luck with Peter's and Miracle Grow fertilizer although there are other good brands on the market. For a large plant it will not hurt to fertilize it two - three times a week. Brugs may also benefit from Epsom salts (magnesium sulfate) applied at the rate of 1 Tbsp per gallon of water once a month. Brugs should be fertilized only during active growth, not during winter dormancy.