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A.R. Chase
A.R. Chase is president and pathologist of Chase Horticultural Research, Inc., floriculture's premier chemical screening and disease diagnostic company.
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The Changing Face Of Ornamental Fungicides
Greenhouse Product News
November 2006
By A.R. Chase
This fungicide review compares
the industry today with the
industry 30 years ago as well as lists the ornamental fungicide
highlights that occurred
throughout the past year.
PDF Version
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.
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.
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.
PDF Version
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.
PDF Version
The Two Mildews
Greenhouse Product News
September 2004
By A. R. Chase
Don’t forget that powdery mildew fungi attack more than leaves.
PDF Version
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.
PDF Version
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.
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.
PDF Version
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.
Which Poinsettias do Consumers Prefer?
Greenhouse Product News
April 2002
Jim Barrett, Rick Schoellhorn and Allen Hammer
Consumer surveys were conducted at Purdue University and the University of Florida, and the results are presented here. While there are some differences in the details of the results, the general information generated by the two studies provides important information.
PDF Version
2001 Poinsettia Trials: Regionally Recommended Cultivars
Greenhouse Product News
February 2002
Jim Barrett and Allen Hammer
The following poinsettia cultivars are recommended for growers to consider. The recommendations are based on university trials and observations of commercial crops. Primarily, this list includes cultivars that the authors have grown at least two years. The cultivars listed as “worth watching” are the new ones that performed well in the Fall 2001 trials.
PDF Version
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.
PDF Version
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.
PDF Version
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.
PDF Version
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.
PDF Version
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.
PDF Version
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.
PDF Version
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.
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.
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