View All: Articles

August 06, 2013
Mealybugs are one of the most destructive insect pests of greenhouse and interior plantscape environments. One of the commonly encountered mealybug species of greenhouses is the citrus mealybug, Planococcus citri (Figure 1). Citrus mealybugs are...
July 10, 2013
Many poinsettia growers in the United States and around the world experienced trouble controlling whitefly during the 2012 growing season. It was worse in some places compared to others. The source of the plant material and how growers set up their...
July 10, 2013
It seems like the explosion of new diseases has accelerated in the past 10 years or so. Marge thinks we are being tested. Having mastered the ABCs of plant disease, we are now into the exam period, to see if we can still help people protect their...
June 11, 2013
Pest prevention is imperative for profitable plant production, and integrated crop management (ICM) is one of the best strategies to achieve it. Many growers find planning and implementing an ICM program can be daunting. However, with new...
May 09, 2013
During the past 20 years, rose downy mildew has become a serious problem, causing significant losses to growers almost every year. The disease has been found in nearly every state across the United States (and Canadian provinces). It does not occur...
April 16, 2013
Late in 2006, and certainly during 2007, Western flower thrips (Frankliniella occidentalis) caused a lot of headaches for growers, not only in the United States and Canada, but at a global level. It became clear that some of the pesticides that had...
April 16, 2013
Black root rot (BRR) caused by the fungus Thielaviopsis basicola is a very persistent and damaging disease for growers of bedding plants, herbaceous perennials and some woody species — including poinsettias. This disease is seen most often on pansy...
March 19, 2013
Even though cases of impatiens downy mildew were confirmed in 33 states in 2012, growers are planning to produce Impatiens walleriana this year. However, Bill Calkins, business manager independent garden centers at Ball Horticultural Co., says in...
March 19, 2013
Each year the North American Poinsettia Trials evaluates hundreds of poinsettia cultivars, many of which are new to the market. However, as any poinsettia grower will tell you, selecting the right cultivar is only the beginning. Many decisions have...
February 05, 2013
You would like your plant’s root system to be in balance with the soil, your growing media. Balance in water, balance in food, balance in microbes and balance in organic/inorganic matter all group together to maintain the health of the roots....
December 06, 2012
I have been working on ornamental diseases caused by bacteria for more than 30 years.  This started with diseases of foliage plants at the University of Florida in the 1980s and early 1990s. At that time, the only effective choices were...
December 06, 2012
To learn about diseases affecting primula, click on the PDF link below.
November 12, 2012
To learn about diseases affecting coleus, please click on the PDF below.
October 12, 2012
Although it feels like we are being inundated with new downy mildew diseases, downy mildew of basil was actually first found in Uganda in 1933. The current outbreak started in the United States in field-grown basil in south Florida in October 2007....
September 10, 2012
A plant diagnostic lab is a useful resource for growers with plant problems. Plant pest and disease diagnosis requires a partnership between the lab and the grower, and this article offers best practices on how to take full advantage of the services...
September 10, 2012
To learn more about diseases affecting lobelia, please click on the PDF link below.
August 09, 2012
No matter their size, pests can quickly spread as plant material is moved from facility to facility and become unmanageable, leading to shrink, reduced profits and even loss of native species. In this fifth article, the ornamental pest management...
August 09, 2012
To learn about diseases affecting dieffenbachia and aglaonema, please click on the PDF link below.
July 11, 2012
Western flower thrips (WFT), Frankliniella occidentalis, is still one of the most destructive insect pests of commercial greenhouses feeding on a wide variety of horticultural crops. WFT damage potential is due not only to its ability to directly...
July 11, 2012
In this issue, we present a summary of diseases that occur in ranunculus. Remember: Product controls are based on research trials and do not reflect an endorsement of any sort. To learn more about diseases affecting ranunculus, click on the PDF link...
Email Subscriptions