![]() Good air circulation will also help – dig up and divide overcrowded plantings. When irrigating, use drip or soaker hoses rather than overhead, or water early in the morning so the foliage can dry quickly. Fall-clean by removal of plant tops and fallen leaves at the end of the season can help lessen the amount of overwintering inoculum. Improving aeration by increasing the space between plants helps reduce the chance of Botrytis blight. ![]() There are a few fungicides labeled for use on peonies for this disease, but they would have to be applied early and often to protect the leaves from infection rather than wait until after the disease is present.įor both diseases, good sanitation is the best prevention strategy, including removal of infected foliage as it appears. The fungus overwinters on plant debris and tends to be present every year once it occurs.īotrytis blight also causes blackening of leaves, stems and flowers and is especially prevalent in wet seasons, so it would be a prime suspect this year. The numerous common names reflect the various symptoms, including blotches on leaves and stems and small red spots (measles). Leaf blotch is also called red spot or measles. Water early in the day to allow foliage you may get wet and the soil to dry out a bit as the day warms up. Water at the soil level, or use an irrigation system like drip feeding. Peonies are susceptible to a couple of common fungal diseases – leaf blotch and botrytis blight. Avoid watering overhead and wetting the leaves. Is this something that will spread to the other peonies? Some of my beds are crowded and don’t get good air flow, but these peonies are on the border and not at all crowded. The stems turn black and the foliage dies. ![]() I am a loyal reader of your “Green Thumb.” I’m having trouble with several peony bushes (two out of 12). PPDL/weeklypics/7-27-15.html and Purdue Extension bulletins: Various peony varieties differ somewhat in disease susceptibility. Remove the top 2 inches of soil around the infected plants and replace it with fresh soil and a topdressing of sand or very fine pebbles. The fungus thrives in areas that are cool and moist and where plants are overcrowded. You may also reduce Phytophthora infection by improving drainage. Give adequate space between plants to allow for good air circulation. Several botrytis species are known to infect peony, including Botrytis paeoniae, Botrytis cinerea. Remove and destroy all infected plant parts as soon as they are observed. Management of the disease is reliant on cultural control, site hygiene measures and fungicide inputs. More information on powdery mildew can be found at Botrytis is one of the most economically significant pathogens affecting peony, and can result in crop losses in excess of 20 during wet years. Is this also a shady location? If so, replacing the lilac with a better adapted species might be the best option. The siting of your plant looks like it might suffer from lack of good air circulation, being in the corner, and also not much area for good root growth.
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