Greenhouse Weed Control Tips
Greenhouse Product News
March 2008
By Fred Hulme
Controlling weeds in the greenhouse can be quite challenging. Read on to explore the basics of weed management and learn about some best management practices.
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Diagnosing and Treating Coleus and Downy Mildew
Greenhouse Product News
October 2007
By Mary Hausbeck
Both seed and vegetatively propagated coleus are susceptible to downy mildew, a tricky and elusive disease that is relatively new to the United States. For the latest research on warning signs and effective treatments from MSU, keep reading.
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Sanitation’s Place In An IPM Program
Greenhouse Product News
August 2006
By Brian Hogendorp and Raymond Cloyd
Do you discard plant material and growing debris
into refuse containers and forget about it?
According to University of Illinois researchers,
this “out-of-sight, out-of-mind” philosophy
could lead to continual insect and mite problems.
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Managing Pests In Small Greenhouses
Greenhouse Product News
March 2006
By Colleen Armstrong
The small greenhouse is not immune to insect and mite infestations: Growers must discover the best combinations and use multiple strategies to prevent plant injury and economic loss.
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The Year Combos Came To Town
Greenhouse Product News
November 2005
By A.R. Chase
One of the ways to avoid overanticipation in the future is to only talk about the products the companies themselves are talking about — but this assumes they are better at guessing than anyone else.
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Advanced Treatment of Alternaria
Greenhouse Product News
July 2005
A.R. Chase
Always use pathogen-free plants when available. Early diagnosis of a problem is also critical, since choosing appropriate control measures depends upon an accurate diagnosis.
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The Mealybug Scourge
Greenhouse Product News
May 2005
By Jim Bethke, Oliver Siapno
Early detection of mealybugs is very important, and monitoring requires regular inspection of host plants for waxy white deposits and the presence of ants and or sooty mold.
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Disease-Suppressive Media
Greenhouse Product News
March 2005
By Bridget White
Appropriate technologies such as steam pasteurization, soil solarization and the use of disease-suppressive media are now widely accepted as viable non-chemical alternatives.
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Five Keys to Quality Spring Plants
Greenhouse Product News
February 2005
By Roger Styer By Roger Styer
Days are full of transplanting, watering, moving crops, spraying and other needed duties; however, sometimes growers can forget about some key factors in growing quality plants.
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Fungicides for the Future
Greenhouse Product News
November 2004
By A. R. Chase
I decided to review three new fungicides that are currently under development and are expected to be registered for ornamental use in the next year.
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Ralstonia Again
Greenhouse Product News
November 2004
The good news is that it doesn’t appear that any of the geranium suppliers shipped the disease into the country.
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The Two Mildews
Greenhouse Product News
September 2004
By A. R. Chase
Don’t forget that powdery mildew fungi attack more than leaves.
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Rhizoctonia Rising
Greenhouse Product News
July 2004
By A. R. Chase and Margery Daughtrey
The nurseryman creates ideal conditions for Rhizoctonia diseases by growing plants in covered structures that are heated and irrigated overhead.
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Keeping the Industry Clean
Greenhouse Product News
May 2004
By Bridget White
Visiting both Guatemala and Costa Rica, we spent seven full days on the road learning the basics of stock and seed production.
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Pythium and Recycled Irrigation Water
Greenhouse Product News
May 2004
By Ping Kong, Patricia A. Richardson and Chuan Hong
Reclaiming water may be cost efficient, but are you doing the right things to prevent a Pythium outbreak?
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Managing Mites
Greenhouse Product News
March 2004
By Daniel Gilrein
The good news is that more than 15 miticides are now available for greenhouse use, with no small credit due to the industry in Japan.
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Media pH and EC Effects
Greenhouse Product News
March 2004
By Roger C. Styer
Media pH determines the availability of nutrients to the plant. If you go too high or too low, bad things happen.
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It’s Back
Greenhouse Product News
March 2004
By M.K. Hausbeck
Although downy mildew diseases look the same, they are quite different microscopically with each preferring a particular plant.
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Grower 101: Rapid Diagnostic Kit
Greenhouse Product News
February 2004
By Mike Tiffany
Viral infection often reduces the number of cuttings that a stock plant can produce and can affect the flower color and quality of the plant. Results from rapid diagnostic kit tests are ready in about 10-30 minutes.
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The New Pesticide
Greenhouse Product News
February 2004
By Ron Oetting
We have been waiting for this registration for some time, and it is really exciting to finally have it available for growers to use in their rotation for greenhouse pests.
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Control of Botrytis and Sclerotinia on Ornamentals
Greenhouse Product News
January 2004
A. R. Chase
The first article I wrote for GPN was on Botrytis prevention and control, and it appeared in October of 1998. Five years is probably long enough to wait to do an update since we have maintained an active research program in fungicide control of Botrytis on ornamentals trials each winter. During the past two years, we also started working on Sclerotinia blight on petunia.
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The Latest in Disease Control
Greenhouse Product News
November 2003
Margery Daughtrey
The flower industry is conservative about switching to new materials for disease management. Sometimes this heel dragging stems from contentment, sometimes from misinformation and sometimes from fear or frugality. But if you're reading this article you are doing exactly what you ought to be doing: learning about what is available and what is coming, so you are not caught without any knowledge of options when a particular need arises. File this away so you can drag it out the next time you want some additional guidance on an intriguing chemical.
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Bio-Fungicides
Greenhouse Product News
August 2003
Steve Nameth
Many beneficial fungi and bacteria have been isolated from the soil and tested in private and university-based laboratories as to their ability to control plant pathogens. Recently, some of the more promising of these beneficial fungi and bacteria have been further developed and marketed to ornamental plant growers as an alternative to traditional chemical-based fungicides.
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AFE Research Reports
Greenhouse Product News
August 2003
Steven F. Martinez
Since 1961, the American Floral Endowment (AFE) has invested $11 million in scientific research and educational programs. The Special Reports are a result of Endowment-funded scientific research projects at universities throughout the United States. The reports are written by some of the industry's most respected researchers and are set up to provide readers with a basic understanding of the projects, the results and how results can improve horticulture.
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Top Ten Problems of Vegetative Annuals
Greenhouse Product News
June 2003
Colleen Warfield, Brian Whipker, Christine Casey, Raymond Cloyd, James Gibson and Brian Krug
Below are the top ten problems of vegetative annuals we have observed during extension visits to growers and through plant samples submitted to the North Carolina State University Plant Disease and Insect Clinic. Recognizing potential problems and how to prevent or manage them will, hopefully, keep these problems off your top ten list.
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Controlling Black Root Rot of Bedding Plants
Greenhouse Product News
May 2003
Steve Nameth
Black root rot (BRR) is a common and destructive fungal disease that attacks a variety of greenhouse bedding and pot crops. Stressed plants are more susceptible to infection, making stress prevention key to controlling the disease.
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News on the Grow
Greenhouse Product News
March 2003
Catherine Evans, compiler
Ralstonia solanacearum biovar 3 race 2, one of the vascular, bacterial agents that causes southern bacterial wilt, was recently discovered in a limited number of geranium cuttings that were produced offshore, shipped to U.S. rooting stations and eventually rerouted throughout the Eastern, Southern and Midwestern United States. Because of its inclusion in the U.S. Agricultural Bioterrorism Protection Act of 2002 as "potentially posing a severe threat to plant health or plant products," this most recent disease importation caused a temporary quarantine of hundreds of greenhouses.
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Control of Pansy Downy Mildew 2002
Greenhouse Product News
December 2002
Ann Chase
During the fall-winter of 2002, we experienced a severe outbreak of pansy downy mildew across the United States. It was identified by Dr. G.W. Simone as Peronospora violae, the most common downy mildew pathogen on pansies. The opportunity to concentrate on this downy mildew has not been frequent in our facility so we spent much of our efforts on this disease. Several new fungicides were available for evaluation, and they were each tested over the course of the season. We also expanded the work to include eradication as well as prevention with currently available and experimental fungicides.
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Fusarium in Tulips
Greenhouse Product News
December 2002
Bill Miller
In an earlier article in GPN ("Flower Bulb Transportation and Handling," August 2001), the relationships of Fusarium infection, ethylene production and forcing problems were introduced. In this article, we'll review some of the known information on Fusarium infection in tulip bulbs and describe some non-chemical remedies for its management.
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Grower 101: Diagnosing Plant Diseases of Floricultural Crops
Greenhouse Product News
November 2002
Robert Wick
The ability to make an accurate diagnosis on-site is dependent on a disease that has unique symptoms. Also, the grower needs to have previously identified the problem or have a good illustration or written description to make proper identification. There are a number of diseases that can be easily identified on-site, and there are many that can only be diagnosed in a university or private diagnostic lab.
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GROWER 101: Drip, Drip, Drip. Greenhouse Condensation
Greenhouse Product News
September 2002
J. Raymond Kessler, Jr.
High relative humidity at night and condensation can not only lead to disease problems, but will also reduce light intensity. So what conditions lead to this problem, and what steps can be taken to prevent it?
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Diseases of Perennials
Greenhouse Product News
August 2002
Steve Nameth
Disease control of perennials is very similar to that of herbaceous annuals. Number one is knowing what diseases are important and how to identify them. Before you plant anything, be sure that the material you are planting (seed, corm, rhizome, cutting, etc.) is free from diseases and insect pests. Purchasing propagation material from a reputable producer will help ensure high-quality starting material.
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Top 10 Poinsettia Mistakes
Greenhouse Product News
July 2002
Roger C. Styer
Even though it is mid-summer, poinsettia growers have a long way to go before they can ship their poinsettias. During that long period, many things can go wrong. I’ve boiled down the major mistakes I see poinsettia growers making, along with some suggestions to avoid them. See if any of your mistakes are on this list!
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Studying Phytophthora : Foes of Floral Crops
Greenhouse Product News
June 2002
Margery Daughtrey
Phytophthora is one of the special group of plant pathogens termed “oomycetes” — Pythium and the downy mildews are close kin. Analysis of their DNA has indicated that these organisms are more closely related to algae than to fungi. This is the reason why Phytophthora, Pythium and downy mildews are successfully combated by unique fungicides, such as mefenoxam, metalaxyl and dimethomorph, that would not be effective against the true fungi.
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Vegetative Victory
Greenhouse Product News
June 2002
Terri W. Starman and Kristen L. Eixmann
This year at the Pack Trials in California, growers got a sneak preview of the many exciting new species of vegetative annuals that will be on the market next year (see pages 24 and 100 for details). So if you haven’t started growing vegetative annuals, it’s time to start because they are not going away.
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Ornamental Pepper Production Tips
Greenhouse Product News
June 2002
Brian E. Whipker, James L. Gibson, Ingram McCall, Todd J. Cavins, Colleen Warfield and Raymond Cloyd
There are over 30 cultivars of ornamental peppers available. The production tips listed here may help you fine-tune your growing program to produce a higher-quality crop.
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Virus Diseases of Petunia
Greenhouse Product News
May 2002
Steve Nameth
The purpose of this article is to bring the reader up to speed on the subject of petunia viruses and the diseases they cause in this popular ornamental crop.
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Fungicides for Leaf Spot Diseases of Ornamentals
Greenhouse Product News
April 2002
Ann Chase
Fungal leaf spots are the most common and obvious diseases present during ornamental crop production. In most cases, they are easily noticed, and the temptation to guess specific causes is great. While certain characteristics may often be present with each type of leaf spot disease, there are no hard and fast rules about diagnosing by the “seat of your pants.” Most serious diagnosticians recognize the need to culture the pathogen before making a recommendation for the best treatment.
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Easter Lilies: A Challenge You Can Master
Greenhouse Product News
March 2002
Theo J. Blom and Paul Fisher
This year, Easter will be on March 31, 2002, and most plants will be ready to ship (puffy bud stage) between March 11-26, 2002. This early Easter makes for a very tight schedule and means that it is especially important to use the well-proven tools we describe in this article to help you meet flower date and final height specifications.
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Growing Under Open Roofs
Greenhouse Product News
March 2002
Sven E. Svenson
What is the function of a growing structure? To control the environment or to assist the grower with manipulating healthy plant growth? Should the grower and the plants be forced to adapt to the environment the greenhouse provides, or should the greenhouse provide adaptable environments the grower needs to force the crop? Open-roof structures provide more environmental flexibility compared to traditional greenhouse designs.
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Producing Vegetative Petunias and Calibrachoa
Greenhouse Product News
February 2002
John M. Dole, Brian E. Whipker and Paul V. Nelson
In the following article we will discuss how to cost-effectively grow petunias and calibrachoas with an emphasis on the areas we have been researching: propagation and growth (vine) control.
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Cost-Benefit of Ornamental Fungicides
Greenhouse Product News
January 2002
A.R. Chase
For the ornamental producer, it is hard to stop and take the time to
understand a problematic situation, but reflection is critical if you are going to make cost-effective decisions regarding fungicides. What questions should be
answered before deciding to apply a fungicide for disease prevention or cure?
Here are the most important ones.
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Ornamental Disease Control Products —2002 Update
Greenhouse Product News
December 2001
A. R. Chase
Last year, for the first time, GPN published a table, summarizing efficacy results for fungicide and bactericide ornamental trials at Chase Research Gardens. This year, we decided to do the same thing as an annual update.
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GROWER 101: Disease Primer, Part III: Fusarium
Greenhouse Product News
November 2001
Jim McLaughlin
An unstoppable force and dreaded opponent for any grower, Fusarium is difficult to spot and even more difficult to protect against. Fusarium can ruin a beginning grower’s love for floriculture. Not only is it hard to find the fungus, but it also strikes quickly and causes almost instant damage to your plants. The following helpful hints will arm the beginning grower with the tools he or she needs to identify Fusarium and stop its growth.
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Grower 101: Disease Primer, Part II; Root Rots
Greenhouse Product News
October 2001
Jim McLaughlin
The most dangerous threat to roots and stems, root rots can be stopped with proper care and treatment. Here is an outline of what to look for and how to terminate and prevent these diseases.
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Strobilurn Fungicides Update
Greenhouse Product News
September 2001
A.R.Chase
This "new" chemical class continues to gain usage among growers. Below are the latest developments in strobilurn research.
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Grower 101: Managing Resistance in the Greenhouse
Greenhouse Product News
August 2001
Information on fungicide resistance is authored by Robert Wick
Managing pests and diseases in the greenhouse can be a challenge for even the most experienced grower. When resistance is thrown into the mix, new growers are often overwhelmed.
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Improving INSV diagnosis
Greenhouse Product News
August 2001
By Stephen G.P. Nameth
If you’ve received a"false negative" while thrips or infected plant material spread INSV throughout your impatiens crop, The Ohio State University’s ongoing research to pinpoint virus movement and replication may help you.
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2001 Update on Powdery Mildew Control
Greenhouse Product News
July 2001
By A. R. Chase
The beginnings of a crop disease outbreak can slip even the most scrutinizing eye – find out which fungicides make the grade for effective control of powdery mildew.
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Storing Peonies – Disease Free
Greenhouse Product News
January 2001
By Karen L.B. Gast, Ph.D.
To maximize market opportunity that is limited by seasonal harvesting, peony growers often place cut flowers in cold storage for as long as four weeks. During this time, disease, especially Botrytis, can become a serious problem, sometimes ruining entire crops.
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