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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...
November 04, 2003
I know, I know, but I love this plant. I think there is still a lot of room for new cultivars and new forms. Cut me a little slack, and I promise I won't be back to this crop for at least. . . six months. We were doing some work for Ball Floraplant...
October 03, 2003
Tomatoes, the biggest hydroponically produced crop on a worldwide scale, are complex in their physiology and response to crop management techniques since vegetative growth, flowering and fruiting all need to be continually maintained simultaneously...
October 03, 2003
When we started our fall pansy and viola trials three years ago, our objective was twofold: 1) to provide information to growers, breeders and consumers about the performance of different cultivars and 2) to use the trials as a vehicle for consumer...
October 03, 2003
Now that we are in the latter part of October, most poinsettia growers figure their job is finished and are just waiting for the plants to color up so they can be shipped. But this is the most critical time for last-minute adjustments to height...
October 03, 2003
Although it's definitely the plant that counts in the end, you can't deny the effects of container size. It can control your plant's growth in order to meet a specific consumer demand, capitalize on space in order to ameliorate shipping cost, and...
October 03, 2003
Watering and fertilizing are two tasks that take the most amount of time in your greenhouse, and fertilizing is also one of the most important. You want to get the job done quickly and accurately, meaning you want an injector that is easy to install...
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