The chief cause of drooping rhododendron leaves, as opposed to leaves showing additional symptoms of spots and discoloration, are soil-borne fungal diseases that thrive in moisture. … Rhododendron Leaf Problems. Chemicals are ineffective on this fungus. drooping leaves; please help ; 0 answers. All Rights Reserved. If the shrub continues to droop during the early morning hours, water the rhododendron thoroughly. Soon your rhododendron should perk up with no ill effects from hot temperatures. Nighttime is often the best time to see adult weevil activity. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. During Summer, it is … To avoid drying out, the leaves close their stomata, causing them to curl and droop. Rhododendrons Suffering From Cold Weather. Splitting bark is a dangerous problem and rhododendrons distressed this way may die back. This drooping is not caused by disease or insects, but rather the rhododendron’s natural reaction to windy, dry, cold weather. Sprinkle some Epsom Salts* around the plant to correct the issue. Early weevil identification is important to save the rhododendron. If you try to pull up the roots, the stem may break. To control two-banded Japanese weevils, use Orthene. Our very wet spring may have aggravated the the situation. The bottom of the stem near the soil will be discolored brown, and the roots will look blackened and soggy. If the vole chews all the way around the trunk, the plant will die. Discovering the cause will make treatment options much more effective, and employing basic preventive practices will enable you to avoid the problems in the future. The best way to control the fungus is through prevention. Rhododendron is a genus of plants with more than 850 species, from ground covers to shrubs and trees. Also purchase a foliar spray to control the adult weevils. Drought could have been a major factor in your Rhododendrons brown leaves. If Phytophthera root rot is the problem, the smaller roots will be missing and the larger roots will be discolored… Make sure the root ball of a newly planted rhododendron is level with the soil. Spray the foliage with a fine water mist every day during extreme heat. Rhododendron leaves will often curl and droop in response to cold weather. If the air temperature tops 95 degrees F, the foliage will often droop. If the soil is wet, then the cause is likely a disease or pest. Rhododendrons are fibrous, shallow rooted plants that need good drainage to perform well. Rhododendrons can be planted along foundations, as a hedge, mixed in a landscape theme or as a single-specimen planting. Keep voles away from the trunk of the shrub by not applying mulch all the way to the trunk. There are cultivars available with some resistance to phytophtora dieback. Rhododendron roots grow in a very shallow spread and take a great deal of time to spread out in search of water, so a newly planted rhododendron's roots remain in a tight root ball and are unable to utilize the surrounding soil's water conditions. Rhododendrons are an evergreen bush, which means it sports leaves throughout the year. Chemical fungicides are not effective in controlling phytophthora root rot once symptoms appear. Nonetheless, you should check the soil moisture about 6″ to 1′ below the surface with a moisture probe or a screwdriver. It’s actually a species native to Connecticut, I was told. Phytophthora root rot caused by the fungus Phytophthora cinnamomi likes warm, wet soil. Historically, gardeners have been told to dig a hole twice as wide and twice as deep as the root ball. asked Jul 28, 2013 by anonymous | 119 views. To help prevent this make sure the shrub has sufficient water. Her writing has a strong focus on home improvement, gardening, parenting, pets and travel. I purchased an expensive yellow-flowering rhododendron back in May and planted it in a raised foundation planting I have on the north side of my home. Watch for vole activity. The two-banded Japanese weevils are immune to carbaryl, diazinon and malathion. The soil should never be soggy wet, but it should be moist to the touch. One potential Rhododendron problem is that the leaves are turning yellow. Rhododendrons and azaleas subjected to water shortage will sometimes die, others will just have one section of the plant die. When temperatures drop below freezing, rhododendron leaves may cup and curl at the edges and droop. If the air temperature tops 95 degrees F, the foliage will often droop. If you have clay soil, amend it to improve draining before you plant rhododendrons. Instead of blooming around Memorial Day, it blooms around the 4th of July, nearly 6 weeks later, and is therefore called the 4th of July Rhododendron. Drooping foliage on a rhododendron is common in extreme heat. Choose a mulch that is course so air flow can still reach the roots, but that the soil is shaded to prevent water evaporation. Its symptoms begin with brittle, reddish-brown roots close to the soil. Here’s how to help: Whenever the temperature gets above freezing, give your rhododendron a slow and steady trickle of water until the soil feels damp 8-10 inches down. I have a rhododendron. Phytophthora root rot can cause a rhododendron to suddenly droop and then die. The shrub will simply droop due to low humidity. What is causing this. Rhododendrons encounter diseases, fungi, and climatic issues that can result in brown spots, or even entirely brown leaves. At first it had lots of new growth and nice yellow flowers. The shrubs adore acidic, rich soil and often flourish in woodland settings. What may be causing this problem/ It is not for lack of water. why is my jewel eye sumac drooping? Follow the directions on the label. The larvae of the weevil feed on the roots which slowly kills the shrub. The soil should never be soggy wet, but it should be moist to the touch. They can even be found growing in the arctic and north temperate zones. Mulch around the base of the rhododendrons to help water retention in the roots and prevent drooping. So make sure the hose drips slowly for several hours to thoroughly water the root ball.

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