To read more about crispy brown leaves in houseplants in general, be sure to read my blog post on why plant leaves turn brown and crispy. However, most of them have crispy brown leaf edges. Begonia leaves are turning brown on the edges and dying. They are glucosides (carbohydrates) that are dissolved in the cell sap, which is the fluid in the cell vacuole. Without any doubt, the Begonia maculata is one of the prettiest Begonia plants I have ever seen.. Discard infected plants. Begonia plants come in many varieties and hybrids, in different colors, sizes, and shapes. Although many plants can handle a powdery mildew infestation, the fungus can cause serious injury to begonias. 10 years ago. Red Pigments by Arlene Hoskins. Plant … I've recently become interested in rex begonias and I've acquired a few different plants over several months. Begonias are tropical plants known for their waxy flowers and varicolored leaves. Purchase plants free of symptoms. woodii. On the other hand, you must NOT keep any begonia too wet. The silvery-white polka dots look almost unreal as if they were painted onto the deep olive-green leaves. They looked fine when they first went out a week ago but now some have leaves that have gone limp and are turning white though they are all in new compost to which Miracle Grow and crystals to retain water have been added. Impatients necrotic spot, tobacco ring spot, broadbean wilt, cucumber mosaic, tobacco necrosis virus. The same thing happened to the other begonias that … A few days later leaves on the first plant started to shrivel and take on the appearance of ancient parchment. According to Cornell University, powdery mildew can affect a begonia's … Home > Begonian > Volume 70 (March/April 2003). I recently planted out my begonia plants that I started off from tubers. Pink, red or purple color in leaves is caused by the presence of pigments called anthocyanins. 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