OFA Bulletin September/October 2012 : Page 1

September/October 2012 • Number 935 September/October 2012 • Number 935 Top Diseases of Herbaceous Perennials By A. R. Chase he most common diseases of herbaceous perennials in the landscape can differ based on what is being grown. This is, of course, influenced by the area of the country you are talking about. Since the Midwest and Northeast have large concentrations of perennials in landscapes, I asked Marge Daughtrey (Sr. Extension Specialist at Cornell University’s Long Island Horticultural Research and Education Center) what she saw most often. This is the list she provided: foliar nematode, Septoria leaf spot, rust, daylily leaf streak, downy mildew, powdery mildew, Rhizoctonia crown rot, tobacco rattle virus, and Hosta virus X. T Foliar Nematodes Foliar nematodes can be common on Japanese anemone, bergenia, hosta, phlox, echinacea, and ferns. They can be confused with bacterial leaf spots and downy mildew on some plants since they may all develop necrotic lesions that are confined between leaf veins. Symptoms appear first on older leaves; you can sometimes slow down progress by hand picking the affected leaves. Be sure to destroy them or remove completely from the landscape area (do not put into a compost pile). If you irrigate at the ground level you can Continued on page 8 Grasses & Grass-Like Plants for Containers, Borders & Small Gardens By Rita Randolph n all my container and garden designs I consider foliage first. Flowers can be fickle; when the foliage looks great and entertaining to the eye, flowers are a bonus. Bold leaves, glittering spillage, and fine textured foliage each play an important part in the complete design. Grasses and grass-like plants are critical components in the design process adding a graceful stature, texture, and cascading sweeps that blow gently in the breeze. I The taller grasses, both annual and perennial, catch our eyes dancing in the sunlight, especially when in bloom. Large containers have benefited from these for years as most of us are quite familiar with Pennisetum rubrum ‘Purple Fountain Grass’, and use it freely when space allows. It compliments the bold colors of coleus and many of our favorite flowering annuals. Likewise, Continued on page 10 Annual Beauties Inside this Edition ... Top Diseases of Herbaceous Perennials Grasses & Grass-Like Plants for Containers, Borders & Small Gardens Quarantine-37, NAPPRA & Plants to be Planted! Fine Tuning Overhead Calculations 1 1 2 4 Interiorscape Plant Disorders Mealybug & Scale Management: How Can You Deal with Them? The Next Five Years: Opportunities & Challenges for Independent Garden Centers 15 18 21 OFA Member Spotlight News from the American Floral Endowment There’s a New OSHA in Town OFA News 23 24 30 31 OF A Bulletin This is a member benefit of OFA – The Association of Horticulture Professionals. 1

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