Understanding Pre-Mix Fungicides
Greenhouse Product News
July 2006
By A.R. Chase
A growing trend in the industry, pre-mix fungicides have
many benefits — from lowered costs to excellent resistance management — yet, they are not the cure-all answer for disease.
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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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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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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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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Finishing Bedding Plants and Perennials
Greenhouse Product News
July 2003
Roger C. Styer
It's time to recap problem areas. My top five encompass the growers' greatest concerns. These top issues are where I spend most of my time with clients.
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Methyl Bromide Alternatives
Greenhouse Product News
July 2003
Ann Chase
The combination of methyl bromide and chloropicrin has long been used to control weeds, nematodes and plant pathogens like Pythium. Some industries have found acceptable alternatives over the past five years and no longer use methyl bromide. Floriculture has been struggling to find an acceptable alternative.
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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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Fungicides on the Horizon
Greenhouse Product News
November 2002
Ann Chase
One of the more interesting aspects of the new products is their diversity. They range from newer, better strobilurins (and their close relatives) to really old (from the 1960s) chemistry being tried in a new arena. Some of the products are already registered on turf, and we should see ornamental labels soon. For those that are not even registered in this country, the wait may be longer, although everyone is looking for reduced-risk products, and that significantly shortens the wait.
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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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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.
Avoiding Top Problems of Poinsettias
Greenhouse Product News
July 2002
Brian E. Whipker, Colleen Warfield, Raymond Cloyd, James L. Gibson and Todd J. Cavins
Poinsettias can, at times, be a problematic crop, but being aware of the more common nutritional, physiological and insect and disease-related problems encountered during production can help reduce the headaches. By watching for potential problems, understanding their causes and knowing the proper corrective actions to take, one can avoid most of these issues.
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What About Generics?
Greenhouse Product News
July 2002
Ann Chase
Although we do not have true generics available for our plant health care needs, we are faced with essentially the same question: What about using a generic? As with most simple questions, the answer is complex.
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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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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.
Don’t Expect Pythium Root Rot to Always Act the Same
Greenhouse Product News
February 2002
Gary W. Moorman and Margery L. Daughtrey
Cornell University trials are teaching researchers more about this troublesome pathogen, how it interacts with the plants it infects and how it is becoming more difficult to control — and what they’ve learned may surprise you.
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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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