The Low Down on Downy Mildew   Greenhouse Product News August 2005   By A.R. Chase
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What Can Phosphonates Do For You?   Greenhouse Product News April 2005   By A. R. Chase
A review of the literature shows that oomycetes are not the only targets for phosphonates.
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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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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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Bacterial Diseases: Are we losing the battle?   Greenhouse Product News April 2004   By A. R. Chase
With the popularity of perennials, we have seen more bacterial diseases; find out what recent bactericide introductions mean for control and rotation.
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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.

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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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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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.

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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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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Disease Management   Greenhouse Product News March 2001   A. R. Chase
Depending on the disease present and the chemical used, mixing a wetting agent into your fungicide treatment is not always necessary. The trick is knowing what to use and when.
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2001 Product Efficacy Update: Disease Control On Ornamentals   Greenhouse Product News December 2000   By A. R. Chase
Controlling disease on ornamentals has come a long way since copper was first used in the mid-1700s. Growers now have an arsenal that includes both old and new products to protect their crops from disease.
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Disease Control   Greenhouse Product News November 2000   A. R. Chase
As the severity and casualties of downy mildew increase each year, growers are put to the test to uncover the best methods for prevention.

The Slippery Plant Pests: Algae, Moss and Liverwort   Greenhouse Product News July 2000   A. R. Chase
These "simple plants" flourish in the greenhouse environment and appreciate any fertilizer or water not taken up by greenhouse crops; they present a major prevention and control challenge.

Combating Powdery Mildew: A Progress Report for the Year 2000   Greenhouse Product News May 2000   A. R. Chase
New weapons, both conventional and biological, in the war against powdery mildew will provide needed help in controlling this quiet menace in specialty crops, perennials and woody ornamentals.

Rhizoctonia Diseases on Ornamentals   Greenhouse Product News March 2000   A. R. Chase
Capable of causing diseases on foliage as well as on roots and stems, Rhizoctonia spp., are among the most diverse of the fungal pathogens; proper identification is necessary for best control.

Bringing in the New and Bringing Back the Old in the Next Millennium   Greenhouse Product News December 1999   A. R. Chase
The new strobilurin chemistry is highlighted in part one of this article. Next month, an old standby, copper, will be discussed.

Preventing and Controlling Botrytis Blight on Greenhouse Ornamental Plants   Greenhouse Product News October 1998   A.R. Chase
Fungicides should be considered a component of a good IPM and scouting program for this disease, which has a track record of developing fungicide resistance.
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