August 16, 2013
Impatiens Downy Mildew: 2013 And Beyond
Between warnings from garden writers and the national media and extensive signage at garden centers and retail outlets, the public was well aware of a problem with Impatiens walleriana this year. “Some people reported they couldn’t sell the Impatiens walleriana they grew because the press had been so alarming to gardeners that they weren’t purchasing them,” says Cornell’s Margery Daughtrey. Growers were also aware of possible problems with impatiens downy mildew and made adjustments to their production. From what Daughtrey observed in the market, the amount growers cut back on producing Impatiens walleriana varied quite a bit in 2013. Some box stores asked growers to produce them, and that was probably the main channel for their distribution this year, she says. Other growers cut back by 40 to 100 percent. “If they did not cut back extensively, some of them were left with plants that just didn’t sell,” she says. […]
July 30, 2013
Understand Downy And Powdery Mildews With New Research Reports
The American Floral Endowment (AFE) has released two new research reports to help the industry better respond to downy mildew and powdery mildew: • Understanding Coleus Downy Mildew: Special Research Report #134• Understanding Gerbera Powdery Mildew: Special Research Report #135 In Report 134, Blair Harlan and Mary Hausbeck from Michigan State University examine downy mildew on coleus. The researchers have proposed an integrated pest management program to help growers produce high-quality coleus crops untouched by downy mildew. The gerbera daisy industry in the U.S. is booming but powdery mildew on gerberas threatens profits. In Report 135, Michigan State University’s Leah Granke and Mary Hausbeck examine the effects of environmental factors that could provide a framework for an integrated pest management technique to reduce the number of fungicides necessary to produce a healthy, profitable gerbera crop. AFE offers this research and more than 150 other free research reports online. AFE is […]
July 13, 2013
Impatiens Downy Mildew Incidence Down Significantly In 2013
With more than half of the country impacted by impatiens downy mildew in 2012, it’s a bit of a relief to hear that – so far – confirmed reports of the disease appear to be much lower in 2013. According to a presentation by Ball Horticultural Company’s Colleen Warfield and Cornell’s Margery Daughtrey at OFA Short Course, only Florida, Louisiana, Texas, California and most recently Missouri and Kentucky have confirmed reports in both greenhouses and in the landscape. A number of other states have reported the disease in greenhouses, but in most cases, it doesn’t seem to have made its way out into the landscape there. It’s unclear why the disease hasn’t developed as widely this year, but increased awareness among growers, retailers and consumers may have helped blunt the spread of the disease. One new wrinkle has been the discovery of infection in a species other than Impatiens walleriana: […]
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 […]