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March 18, 2002
I think this crop is a fantastic example of what our industry can do when it puts its mind to it. Six years ago, Angelonia angustifolia was a good little summer annual in the South, but unreliable both in hardiness and in vigor; it was also pretty...
March 18, 2002
Four sets of information are important when assessing the nutritional status of greenhouse crops and developing corrective procedures. First, determine irrigation water quality prior to developing the location. Do this during a wet and a dry period...
March 18, 2002
Commercial, field-grown cut flower production encompasses an incredible array of plant materials, including fresh, dried and preserved flowers, stems and berries. A large portion of fresh and dried cuts in North America is grown outdoors. Cuts are...
March 18, 2002
By the time you read this article, Easter lilies will have been planted, and flowering and height control are likely the major issues remaining for a successful conclusion of this crop. This year, Easter will be on March 31, 2002, and most plants...
March 01, 2002
Two stars of the booming vegetatively propagated bedding plant market are petunias and calibrachoa. These closely related species offer consumers rapid growth, a wide range of colors and durability. The vigor of petunias and calibrachoa, while great...
March 01, 2002
Here it is, the middle of the plug season, and plug growers are wondering how to keep their plugs from stretching or flopping. With short days and low light conditions in much of the country during this time of the year, small seedlings want to...
January 11, 2002
Does ammoniacal nitrogen cause stretch in plants, or conversely, does the alternative nitrogen source, nitrate, cause compactness? What does your experience indicate? Do you have all of the facts? Because the application of high-nitrate fertilizers...
December 28, 2001
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. This chart represents five...
December 28, 2001
This is the time of year when the editors of GPN ask for information on what has been happening with insecticides and other related chemicals and predictions for where they are headed in the near future. Based on recent events, it’s difficult to...
December 03, 2001
Most growers are familiar with aphids, but did you know there are aphids that attack the roots of plants? Yes, the roots. You may be used to looking for aphids on foliage and stems, but with these aphids, you need to pull off the pot and look...
November 30, 2001
Greenhouse carts have gone through many incarnations. The latest is a color-coded, name-plated, transportation and merchandising machine that won’t get lost and doesn’t cost too much. At least that’s what growers want and retailers expect. The...
October 26, 2001
Root rots – Pythium, Phytophthora and Rhizoctonia – are well-known enemies of flowering plants. Some root rots start with the fungal spore Cylindrocarpon, which thrives under wet, soggy or over-saturated conditions. Other fungi, including...
October 26, 2001
As consumers rediscover the ease and beauty of perennials and start to clamor for more varieties, growers must find ways to control the growth of this sometimes unruly group. Plant growth regulators (PGRs) can be an effective method of control, but...
October 09, 2001
Over the past few years, lantana has become one of the more popular spring crops, with several important uses for the grower and home gardener. Many new varieties with varying growth habit and flower color are now available to sustain its popularity...
October 09, 2001
Problems with greenhouse fertilizer programs are common and can result in decreased quality or a prolonged growing period, both of which will decrease profit margin. It is crucial to ensure that the fertilizer needs of your plants are met without...
October 09, 2001
The bad news is that the disease-spreading glassy-winged sharpshooter (GWSS) continues to grab headlines in California. The good news is that the pest is no longer hogging the spotlight. Through innovative research and generous funding, California...
October 09, 2001
  In 2000, I wrote a summary of then current information on one of the newest classes of fungicides for ornamentals –strobilurins. The original compound, strobilurin A, was isolated from a mushroom called Strobiluris tenacellus found growing on...
August 31, 2001
The production requirements of ornamental cabbage and kale can easily be forgotten in the fall because care of the two other major crops, pansies and poinsettias, may take precedence. Production of pansies, poinsettias and ornamental cabbage and...
January 10, 2001
For the past three years, I have been asked to review new disease control products for the ornamental industry. In 1999, I tried to list newer products and their activities, including the broad range of those products now available. In 2000, a two-...
January 10, 2001
Plant growth regulators have been used for many years, primarily as a tool to obtain height control or to promote rooting. Today, there are many fascinating and innovative ways to use the tools of yesterday. Plant growth regulators are now being...