June 11, 2013
Diseases Caused By Pythium
Almost all the crops you grow could be affected by pythium, although geraniums, mums, poinsettias and New Guinea impatiens are more vulnerable than others. Look at some of the symptoms and environmental considerations of pythium and biocontrols and fungicides to suppress the disease.
June 10, 2013
ZeroTol 2.0 Reduces Bacterial Blight In Lilacs
BioSafe Systems’ ZeroTol 2.0 has been proven to reduce bacterial blight on contact. Bacterial blight is a vicious disease for many ornamental crops and it causes small black or brown spots on leaves and stems of plants. A 2012 research study conducted by Oregon State University evaluated the effectiveness of ZeroTol 2.0 against bacterial blight in lilacs. In one evaluation, results found that ZeroTol 2.0 significantly reduced bacterial blight incidence by up to 65 percent. Similarly, the disease severity (shoots with 50 percent blight) was reduced by 60-90 percent in ZeroTol 2.0 treated bushes. ZeroTol 2.0 is a broad-spectrum bactericide/fungicide that increases plant health and reduces losses. ZeroTol 2.0’s active ingredients, H2O2 and PAA, work in unison as a contact chemistry to reduce populations of dormant spores and active disease organisms. For more information on how ZeroTol 2.0 controls bacterial blight, contact BioSafe Systems at 888-273-3088.
June 4, 2013
BASF Launches Empress Intrinsic Brand Fungicide
BASF has launched Empress Intrinsic brand fungicide, an effective drench fungicide for soil-borne diseases. With active ingredient pyraclostrobin, Empress Intrinsic brand fungicide provides protection against four root and crown disease pathogens — Fusarium, Phytophthora, Pythium and Rhizoctonia. Additionally, research shows Intrinsic brand fungicides control disease and give plants resilience to stresses that can occur during production. The product is the second fungicide brought to the professional ornamentals market labeled for disease control and plant health. “The consistent performance of Empress Intrinsic brand fungicide gives nursery and greenhouse growers outstanding control of soil-borne diseases,” says Kathie Kalmowitz, market development specialist for BASF. “When used during transplant and at propagation for rooted plugs and seedlings or rooted cuttings, the plant health benefits of Empress Intrinsic brand fungicide include increased growth efficiency through stronger and enhanced root growth, as well as improved stress tolerance.” Labeled use sites for Empress Intrinsic brand fungicide include greenhouses, […]
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 […]