![]() Using a spray bottle, spray on tops and bottoms of leaves until the mixture drips off. Dissolve ½ teaspoon of baking soda and one teaspoon of liquid soap in a gallon of water. Organic options won’t kill the fungus, but will prevent it from spreading. It is recommended to start by applying organic treatment options, working up to the more potent synthetic, chemical fungicides if necessary. However, if much of the foliage is affected and defoliation occurs, the plant will benefit from getting rid of the infection. Virginia Tech Learning Resources Center, VPISU, Bugwood.Solutions: In minor cases of brown spot, there isn’t any need to treat the disease. Southern blight (Sclerotinia rot) on peony ( Paeonia). Mycellia of southern blight on pinnellia ( Pinnellia tripartita) Southern blight on pinnellia ( Pinnellia tripartita) Sclerotia of southern blight on hosta at base of leaf petiole Southern blight causing collapse of hosta ( Hosta)įungal mycelium of southern blight on hosta at base of leaf petiole Wilting and dieback of Japanese anemone caused by southern blight or crown rot Strategies 1, 2, 3, 4, and 5 are strictly organic approaches.ĭieback of hosta from southern blight note, white coarse cottony webbing (mycelium) at the crown of the plant ![]() Pesticides registered for control of crown rot include mancozeb and thiophanate methyl (Cleary 3336). Clean all tools used in digging with a solution of 1–part bleach to 9–parts water to disinfect the tools and reduce spreading the disease to other locations in your garden.Ħ. Increasing the organic content of the soil and improving drainage will make the environment less desirable to the fungus.ĥ. Cover the area with clear plastic and leave it for two to three months in the heat of the summer.Ĥ. If you do not remove the soil and the area receives at least two to three hours of direct sun, solarize it. ![]() Dig out and replace the soil to a depth of 8 inches and 6 inches beyond the diseased area.ģ. Plants can be buried, but do NOT place them in your compost pile.Ģ. Remove diseased plants as soon as they are noticed. Conditions of 86–95 degrees F for several days with intermittent rains are conducive for fungal development.ġ. The fungi which cause crown rot ( Pellicularia rolfsii, Sclerotium delphinii, and Sclerotium rolfsii) survive in the soil and are spread by flowing water, transported or contaminated soil, transplants, and tools. ![]() Enough sclerotia may form to create a crust on the soil. Sclerotia, which resemble mustard seeds and vary from white to reddish tan to light brown in color, develop at the base of the plant. During periods of high humidity, coarse cottony webbing (mycelium) develops and fans out over the stem base and surrounding soil. When the temperature exceeds 70 degrees F, infected plants develop discolored, water-soaked stem lesions near the soil line. The problem generally requires removal of the diseased plant.Ĭrown rot causes deterioration and rotting of the tissues at the crown of the plant causing the leaves to turn yellow, collapse, and die. It affects herbaceous plants and some woody plants but is most commonly found on ajuga, anemone, campanula, chrysanthemum, delphinium, hosta, hydrangea, iris, narcissus, phlox, rudbeckia, scabiosa, sedum, and tulip. Sclerotia of southern blight (resembling mustard seeds) at the crown of Japanese anemone ( Anemone)Ĭrown rot, sometimes called southern blight or southern stem rot, is caused by several soil-borne fungi.
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