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February 24, 2004
The silverleaf whitefly, Bemisia argentifolii, invaded greenhouses in the United States in the late 80s and has been a major concern for growers ever since. A big step in the management of this pest was the introduction of imidacloprid (Marathon)...
February 24, 2004
Named after a French botany patron, M. Gaillard, gaillardia (blanket flower) has been a staple of the highway wildflower seed program for decades and is the state flower of Oklahoma. The genus has a reputation for being tough, salt tolerant,...
February 23, 2004
Ajuga ‘Black Scallop’ is a stoloniferous perennial groundcover with deeply bronzed, beautifully scalloped leaves. Cultivars of ajuga belong to the mint family (Lamiaceae), which includes many commercially grown perennials and herbs including...
January 22, 2004
We talked about succulents last month, and these crops are two groups there wasn't space for in that column. With all the emphasis on low water use and the constant demand for color, these two crops should be a mainstay for growers. Incorporating...
January 22, 2004
Val-Co Environmental & Greenhouse Systems, Bird-In-Hand, Pa., kept durability in mind when manufacturing the Better Bench System. The Better Bench, greenhouse/garden center bench is cost effective and has a high weight to square foot ratio, yet...
January 22, 2004
Being a "die hard" plant lover and a commercial perennial grower, I've discovered that there are a lot of really cool plants out there. But how many times are the cool plants not conducive to commercial production? They are, more often than not,...
January 22, 2004
Over the past five years, with the support of Floriculture Industry Research and Scholarship Trust (FIRST), we conducted a series of experiments to develop guidelines for using the daily light integral (DLI) to gauge the light environment in...
January 22, 2004
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...
December 12, 2003
Growers often consider tiarella cultivars prime candidates for their product mix for shady locations. After all, tiarellas provide interesting, deeply cut foliage with contrasting leaf patterns and extended bloom times, and they are easy to produce...
December 12, 2003
A number of inexpensive pen-like instruments are available that can be used in the greenhouse to determine growth medium pH and soluble salts. The cost of the individual pH and electrical conductivity (EC) "pens" ranges from $50-80, and a...
December 12, 2003
In recent years, sales of impatiens -- Impatiens wallerana, double impatiens and New Guinea impatiens -- have been phenomenal. However, one problem with impatiens is premature flower and bud drop, which can be induced by ethylene, low light...
December 12, 2003
Though the Scrophulariaceae and Verbenaceae family names may not sound too familiar, you've most certainly grown some member species. Here, we will look at the currently known responses of perennial plants from these families to plant growth...
November 06, 2003
Now that I have the chance to explain to you what is new in the disease control sphere, I find myself thinking that you might not have taken advantage of what was new last year, or the year before last. The flower industry is conservative about...
November 06, 2003
Each year when we do this special chemical section in GPN, I'm a little envious of the insect and disease folks; they always seem to have new stuff to talk about. New plant growth regulators (PGR) just do not come along as fast. In fact, for the "...
November 04, 2003
Festuca 'Boulder Blue' is an outstanding cultivar of ornamental grass. Although it is new to the commercial perennial trade, Boulder Blue was actually selected more than 25 years ago by plantsman Ted Keuttel of Golden, Colo. This cultivar has been...
November 04, 2003
Primula obconica, sometimes referred to as German primrose has soft, pastel-colored flowers in shades of white, pink, orange, purple or lilac. This primrose is attractive as a flowering potted plant or mixed with other plants in color bowls or...
November 04, 2003
Selecting the correct product for the job is very important to the success of a pest management program, but equally important is the equipment and application technique used to apply the pesticide. To help select the right application and equipment...
November 04, 2003
Over the past decade, the agrochemical industry has developed a range of safer products. These new crop protection tools are much more selective against target pests, exhibit low human toxicity and have minimal impact on the environment. Insect...
November 04, 2003
Increasingly, greenhouse growers are applying plant growth retardants to bedding plants during the plug stage. Spraying plants when they are in the plug stage is a very efficient way to treat them, since there are so many in a small area. It's also...
November 04, 2003
Wouldn't it be nice if you had about 135 different options for mealybug control like I had options for governor a few months ago? Yes, that's right, I live in California. If you had that many options, you would be just as confused picking the best...