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May 12, 2015
Gardens in 2015 are seeing bold colors and drought-resistant, easy-to-care-for plants that are suitable for containers, borders and landscapes. Each year, GPN compiles a list of award-winning varieties for the year to share with readers. Judges have...
May 12, 2015
This year marks the fourth edition of GPN’s 40 Under 40 program. Like the previous three classes, the members of the Class of 2015 are truly special. The 40 individuals in this year’s class represent all facets of horticulture, but they all have one...
May 12, 2015
Plant protection of greenhouse-grown horticultural crops requires a basic knowledge of the biology, behavior, and life cycle of the most common insect and mite pests such as aphids, whiteflies, thrips, and spider mites. It also requires a...
April 13, 2015
Figure 1. Sprench applications of PGRs have become more popular on aggressive bedding plant crops such as petunia. I’ve noticed an increasing trend in the use of sprench applications of plant growth retardants (PGRs), especially by large-scale...
April 13, 2015
 Abalzin' salvia is currently offered in two colors: Tabasco and Purple. Salvia is one of the most traditional consumer gardening flowers, combining easy care and a long season of color with a host of other great traits. At one point salvia was...
April 13, 2015
‘Hipsters Zooey’ is heat tolerant and performs well across much of the country. Best leaf coloration occurs in locations with morning sun and afternoon shade. For more than twelve years I have featured a wide range of perennials in this column....
April 13, 2015
For years, the horticulture industry has been at the forefront of the sustainability discussion. Greenhouses and nurseries were using recycled materials and initiating waste-reduction plans long before other industries recognized the need for...
April 13, 2015
Vessel Bio Products is situated within the Ohio Agricultural Research and Development Center’s BioHio Research Park. The horticultural division of Vessel specializes in adapting the sustainable soil health methodologies the company developed in...
April 13, 2015
Western flower thrips are some of the most common and damaging insects found on plants grown in greenhouses. These insects have many characteristics that help them become pests; they have a short life cycle going from egg to adult in about two...
April 13, 2015
If you have only been growing one type of plant, for instance tropical foliage plants, you might think all plants get the same diseases. In my 35 years as a plant pathologist, I have worked on nearly all types of ornamentals from cut flowers to...
April 13, 2015
Of course you do! But do you know what 2015 is the Year of? Do coleus, gaillardia and sweet pepper sound familiar? They should, because those are the crops that the National Garden Bureau (NGB) has designated for its “Year of” program for 2015. Each...
February 13, 2015
Have you ever wondered why different groups of plants get different diseases? If you have only been growing one type of plant, such as  bedding plants, you might think all plants get the same diseases. But since I have switched around from cut...
November 07, 2014
Mite. A four-letter dirty word among greenhouse growers. More specifically, the twospotted spider mite.  These common microscopic pests are one of the biggest nuisances professional greenhouse growers treat within their operations, as they can...
November 07, 2014
Retail sales of cannabis began in Colorado on Jan. 1, 2014. Prior to the start of marijuana sales, Colorado voters last fall approved an excise tax of 15 percent that gives the first $40 million to school construction, and also a special sales tax...
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November 07, 2014
ARC:  In a perfect world there would be no disease I suppose. My favorite solution would be a way to make the plants resist disease genetically since that is the epitome of biological control. If your wishes could be granted, what do you think...
October 08, 2014
ARC:  The horticultural industry is getting greener — or at least trying to — as each year passes. I don’t know many plant pathologists who have had successful experiences with biological control agents for disease prevention. I have had mixed...
September 11, 2014
ARC:  How important are cultural controls when you help a grower minimize a disease? I know I like to spend 90 percent of the discussion on water management, using pathogen-free seeds or liners, and giving the plant the best nutrition. Then I...
August 18, 2014
ARC:  I know most plant pathologists recommend preventive disease control and most growers practice “curative” programs. It’s just human nature to wait until evidence of a problem presents itself before acting. What are your most compelling...
July 09, 2014
ARC:  When we both started in our respective careers, most plant disease control products were quite broad in their spectrum of activity.  In 1979, my first exposure to  fungicides was testing an experimental product with...
June 09, 2014
ARC:  Resistance management is becoming more important daily as our fungicides are more targeted than they used to be. It is easy to tell a grower to rotate to help keep resistance from developing. I find growers sometimes prefer to tank mix...
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