As these sucking pests feed on plant tissue fluid, they excrete a sugary, sticky substance called honeydew. Rhododendron 'Dreamland' (Hybrid Rhododendron), Rhododendron 'Anah Kruschke' (Hybrid Rhododendron), Rhododendron 'Lord Roberts' (Hybrid Rhododendron). It's been a bit overwhelming due to the amount of rhododendrons and the extent of the problems I am finding. Check the bark, stems and undersides of the leaves - you're looking for white cottony objects which contain, or have sitting on top, a shield shaped small insect. I've also seen quite a few minute insects crawling about too that I imagine are newly hatched. For a stronger, high-toxicity approach, choose a pesticide with an active ingredient such as bifenthrin or malathion. Sooty mold is a type of plant mold. Fortunately, if you snap into action quickly you can fix the issue and see your garden back to its original good health. Start by eliminating any ant problem. Hi, can anyone tell me what these two are called? Provide consistent, optimal care to rhododendrons, as healthy plants have a greater ability to avoid... Pests. University of California IPM Online: Rhododendron — Rhododendron Spp. Whiteflies are a common pest to rhododendron plants. Tarah Damask's writing career began in 2003 and includes experience as a fashion writer/editor for Neiman Marcus, short fiction publications in "North Texas Review," a self-published novel, band biographies, charter school curriculum and articles for various websites. I have so far tried spraying them with 'Ecover' detergent to try and loosen the black deposits after looking on google but this did not help. Add another photo. Of the many species of whiteflies, those that most often target rhododendron plants are aptly named rhododendron whiteflies (Dialeurodes chittendeni). The sooty mould fungi use these for growth. Virginia Cooperative Extension: Whiteflies, University of California IPM Online: Sooty Mold, University of California IPM Online: Whiteflies, University of California IPM Online: Ants, Garden Pests: White Under Leaf Hydrangeas. If natural enemies do not control whiteflies, saturate the plant with horticultural oil for a low-toxicity approach to pesticide use. Rhododendrons develop best in U.S. Department of Agriculture plant hardiness zones 4 to 8. Add a photo Check for and control ants near infested rhododendrons. I have been left with no option than using a bucket of soapy water and a sponge and working my way along the plants which is a soul destroying job. © Copyright 2020 Hearst Communications, Inc. Purchase natural enemies at garden supply stores. I have recently discovered that my rhododendrons have succumbed to 'sooty mould' and large areas are completely covered in the black mold. What is Sooty Mold? Firstly, a big thank you to all of you for your help in this. If it is scale, you need to deal with that, or the sooty mould will be back, even if you clean all the leaves. Pests Causing Sooty Mold Leaves Scale – Scale insects commonly cause black fungus on rhododendron. Rhododendron, www.greengardener.co.uk is a good source for purchasing predators. Sooty Mold Caused by Whiteflies on Rhododendron Stems Preventive Care. But if left untreated, it will shade the leaves, reduce growth, and invite other unwanted guests to dinner. Add another photo It is a type of mold that grows in the honeydew or secretion of many common plant pests, such as aphids or scale. Provide consistent, optimal care to rhododendrons, as healthy plants have a greater ability to avoid and overcome pests and illnesses when compared with unhealthy plants. These enemies often control potential pest infestations before they become severe. Natural enemies are beneficial insects that kill pests without damaging desired garden plants. Grows on You is a community for gardeners. Ohio State University Horticulture & Crop Science: Rhododendron. Sooty mold wears away once whitefly infestations are under control. Your lovely rhododendron shrubs provide a profuse bloom of spring flowers that create a strong visual impact in the home garden. Be sure to consider where your rhododendron is planted. Damask holds a Master of Arts in English and creative writing from the University of North Texas. More importantly, you need to find the source of the honeydew. Once cleaned, the beautiful leaf is still there though I am worried that these will soon start to die from lack of sunlight. Grow rhododendrons in areas of the garden that offer partial to full shade for best growth; excessive sun exposure may lead to sunscald. Sooty mould growth is most prevalent where air circulation is poor and humidity high, providing periods of extended wetness (although heavy rain may sometimes wash the growth from the leaf surface). 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