The name may have originally been applied to butterflies of a yellowish color, and/or reflected a belief that butterflies ate milk and butter (compare German Molkendieb (“butterfly”, literally “whey thief”)and Low … ButterflyBushDiseases. Downy mildew is a relatively common problem that can occur when temperatures are cool and the plant’s leaves are wet for a long period of time. Early diagnosis and treatment for any of these diseases will ensure that your ButterflyBush recovers and remains a vigorous grower in your garden for many years. Discover Pinterest’s best ideas and inspiration for Butterflybushdiseases.Click this article to learn more about butterflybushdisease problems. While not a plant well known for problems with pests or disease, butterflybush does fall victim to several strains of root and crown rot, which, according to Laura Pottorff at Colorado State... Butterflybush is a relatively trouble free plant to have in the garden. That being said, there are a few buddleia diseases you ought to look out for if you want your plant to be as healthy as it... A butterflybush with wilting leaves and spotted flowers due to diseases. In my experience, the common ailments affecting butterflybushes include fungal diseases like downy mildew... Downy Mildew On ButterflyBushes. Fungal diseases can become a problem for butterflybushes in cool, damp weather. Another one of the common butterflybushdiseases is rhizoctonia, a fungal root rot that makes leaves yellow and drop and destroys the roots. ButterflyBush Pests and Diseases. Butterflybush is quite resistant to common pests and diseases, but sometimes you may have problems with: Caterpillars. Pests and diseases are usually not big problems for butterflybushes. Maintaining butterflybushes is extremely easy, since these plants adapt so well. ButterflyBush Landscaping Ideas.