June 4, 2013
Taking The Bite Out Of Boxwood Blight
Boxwood blight was first found in the United States in 2011. Since then, the fungus that causes this disease has been found in 10 U.S. states and three Canadian provinces. In this episode of FloriCAST, take a look at the background of this disease, along with research developments on managing it and tips on avoiding boxwood blight. For more information, go to http://go.ncsu.edu/boxwood_blight_links
May 13, 2013
ZeroTol 2.0 Found To Reduce Bacterial Blight In Lilacs
BioSafe Systems’ product ZeroTol 2.0 has been proven to reduce bacterial blight in lilacs on contact. A vicious disease for many ornamental crops, bacterial blight causes small black or brown spots on leaves and stems of plants. Results from one evaluation in a 2012 research study conducted by Oregon State University found that ZeroTol 2.0 significantly reduced bacterial blight on lilacs by up to 65 percent. Similarly, disease severity (percentage of shoots with 50 percent or more blight) was reduced by 60 to 90 percent in bushes treated with the product. ZeroTol 2.0 is a broad-spectrum bactericide/fungicide that increase plant health and reduces losses. Its active ingredients, H202 and PAA, work in unison as a contact chemistry to reduct populations of dormant spores and active disease organisms. For more information, contact BioSafe Systems at 888-273-3088.
May 7, 2013
Impatiens Downy Mildew Found In Michigan
Impatiens downy mildew has been found in Michigan, according to a brief from Michigan State University Extension. “In the last two weeks, downy mildew on impatiens has been confirmed in Michigan greenhouses spanning four counties,” the report states. “In each case, the disease was widespread within the greenhouse and the losses were nearly 100 percent.” The report recommends some newer fungicides, such as Adorn, Segway, Micora, Orvego and FenStop, for downy mildew control. “It has been our experience through fungicide trials that the most effective fungicides must be used in an intensive application program to protect impatiens from this pathogen when the environmental conditions are favorable for disease development,” the report says. Click here to read the full report from Michigan State University.
April 26, 2013
Oasis Grower Solutions’ Floralife Transportcare Paper Approved For Use In California
Oasis Grower Solutions’ FloraLife TransportCARE Paper has received registration approval from the California Department of Pesticide Registration. This means California growers can join the list of growers who can now protect their flowers and plants while in transit from the spread of Botrytis spores in shipping cartons. Botrytis is a widespread pathogen which causes gray mold. The host preferences of this fungus include virtually every plant grown in a greenhouse or field production, creating coating of grayish brown mold that forms on dead tissue when it sporulates. Wounded or older tissue and flower parts are very susceptible. Some of the crops especially prone to Botrytis include rose, lisianthus, gerbera, dahlia, zinnia, anemone, geranium, exacum, primula, bacopa, fuchsia, cyclamen, poinsettia and vinca. FloraLife TransportCARE is a postharvest waxed tissue paper specially designed and formulated to slow the premature spread of plant pathogen spores on flowers and foliage in boxed shipments. These spores […]
April 16, 2013
Impatiens Downy Mildew Found In Ohio
The devastating impatiens downy mildew disease has been found in Ohio for the 2013 growing season, according to a report from The Ohio State University Extension. “In the last seven to ten days there have been several reports of impatiens downy mildew’s appearance in the Midwest; as of this time we have two reports from Ohio,” according to an article on the Ohio State University Extension website written by Francesca Peduto Hand and Nancy Taylor. “The pathogen that causes the disease, Plasmopara obducens, is extremely aggressive on bedding plant impatiens and Ohio’s impatiens producers should be aware of and scouting for this disease.” The article cites the early symptoms of impatiens downy mildew as a slight curling or mottling of the foliage, which may be subtle. High humidity, however, can result in a heavy coating of white sporulation on the underside of the leaves. “One grower described white dust floating above the […]
April 16, 2013
OHP Relaunches Terraclor 400 Ornamental Fungicide
OHP Inc. has relaunched Terraclor 400 ornamental fungicide for users in greenhouses, nurseries and shadehouses. Terraclor 400 can also be used on landscape and field-grown ornamentals. The liquid fungicide is used for control of tough diseases such as rhizoctonia, sclerontinia and phyllostica. Terraclor 400 can be sprayed, drenched or used as a bulb soak on a variety of woody plants, bedding plants and bulb crops such as gladiolas, hyacinths, iris, tulips and lilies. Terraclor 400 can be used on Southern Magnolia Trees for control of Phyllostica cookeri. The product may also be used as a soil drench on vegetable bedding plants grown in containers or beds including tomatoes, peppers, broccoli and cabbage for control of Rhizoctonia solani prior to transplanting in the field. Terraclor 400 carries a 12-hour REI and a Caution signal word. State registrations are pending. For more information please refer to the Terraclor 400 tech sheet.
April 9, 2013
Why Are Thrips So Hard To Manage
Western flower thrips are probably a pest for at least some of the crops you grow. Learn about the characteristics of thrips’ biology that makes them so difficult to manage and the best methods to control them in your greenhouse in this episode of FloriCAST.
April 5, 2013
Download: Your Rose Rosette Questions Answered
Are certain rose cultivars more susceptible to rose rosette disease than others? Does the eriophyid mite that vectors the rose rosette disease virus vector any other diseases to other ornamental or ag crops? Within what radius of a nursery does multiflora rose need to be eliminated? Many questions were generated during our Rose Rosette Disease: History, Spread And Prevention webinar. We compiled the answers to the questions asked by attendees during the webinar, answered by Jim Amrine, Jr., Professor Emeritus of Entomology, West Virginia University, and Conard Pyle’s Mike Dobres. Click here to download the Q&A from the webinar in PDF format. .
April 1, 2013
Greenhouse Diseases 101: Rhizoctonia
Damping-off of is a general term that describes the death of seedlings from fungal disease. There are several fungal organisms that can cause damping off, including Botrytis, Sclerotinia, Alternaria, Pythium and Rhizoctonia. The last two are the most common culprits. At some point in his or her career, most growers have had the experience of seeing sections of seedling flats turn brown right at the soil line and topple over. This is often an indicative sign of Rhizoctonia (Rhizoctonia solani). Older, sturdier seedlings may die, but are more likely to stay upright. While some fungi are host-specific, Rhizoctonia does not discriminate, and it can infect practically all herbaceous and woody greenhouse crops. Younger plants are most susceptible. The collapse and death of seedlings, which have brown lesions on the stems right at the soil line, is the most commonly associated sign of Rhizoctonia, but the disease can kill seedlings before […]
March 19, 2013
Greenhouse Diseases: Phytophthora
Phytophthora is a serious disease of floriculture crops, and it is especially difficult to control once it has become established. It is one of several organisms that cause root and crown rots. Phytophthora is closely related to Pythium, which also causes root rot. While there are a wide variety of plants that are susceptible to Phytophthora, some are more likely to be infected than others. Poinsettia, rhododendron (azalea), fuchsia, vinca, gloxinia, lantana, African violet, begonia and ornamental peppers are among the more common hosts of the disease. There are several species of Phytophthora, and they are host-specific, meaning each species will only affect certain types of plants. Symptoms To Watch ForInfected plants will display symptoms of wilting and overall decline, including dark lesions, known as cankers, at the crown of the plant. The cankers impede the flow of water and nutrients between the roots and leaves. When they become large […]
March 19, 2013
Four Sources Of Diseases In Vegetable Bedding Plants
How do vegetable seedlings get diseases? Review the four common sources of pathogens in vegetable seedlings – contamination, seed, air currents and insects – and quick tips for managing diseases in this episode of FloriCAST.
February 27, 2013
Greenhouse Diseases 101: Chrysanthemum White Rust
Chrysanthemum white rust (CWR), caused by the fungus Puccinia horiana, is a serious disease with the potential to cause widespread damage both within the greenhouse and to the North American floriculture industry at large if it becomes established on this continent. It originated in China and Japan, but has spread to most other continents, including Europe, Australia, South America and Africa. So far, only isolated cases have been reported in the North America, and aggressive control methods have so far kept the disease from becoming established. Federal quarantine restrictions (six months post-entry) apply to all imported chrysanthemum cuttings, and importation of cuttings from infested countries is prohibited. Disease SymptomsThe first sign of the disease is small white or yellowish spots on the upper leaf surface. Over time, the spots turn brown and may appear sunken. If the leaf is turned over, fuzzy-looking pustules are visible directly underneath the spots. They […]