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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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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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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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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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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.
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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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