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December 31, 2002
Tulip forcing in 2002 has been difficult. In many greenhouses, tulip crops were uneven and, overall, very short. Upon flowering, many pots had one or more stems with blind shoots, where the bud may have been aborted at a relatively late stage (...
December 31, 2002
Downy mildews have gained a strong foothold in the horticultural industry throughout the United States and Canada over the past few years. During the fall-winter of 2002, we experienced a severe outbreak of pansy downy mildew across the United...
November 07, 2002
An accurate diagnosis of disease is important for several reasons. Bacterial diseases are not controlled with fungicides, and some bacterial diseases are easily mistaken for fungal diseases. Some fungicides have a narrow spectrum of activity. In...
November 05, 2002
I've been kidding around at some of the recent conferences by polling the audience to determine its makeup. First, I ask how many in the audience work in greenhouses, then how many work in nurseries or both since many nurseries have associated...
November 05, 2002
It seems like only a short while ago since I was trying to write this article for 2001. Now it is 2002, and I wonder what has changed in the past 12 months. Although we have seen registrations for new fungicides during the past couple of years,...
October 10, 2002
Fungus gnats are common pests in greenhouses. Their larvae feed on the roots of many different crops, which can cause direct damage to the crop. The root damage caused by the larvae also makes it easier for fungal pathogens to enter into and infect...
October 10, 2002
Pesticides used today are less toxic and used less frequently than several years ago. Nevertheless, they can be a serious hazard to employees if not stored and used properly. Storage Store pesticides in a room located away from eating areas, boiler...
August 22, 2002
The Native American perennial heuchera has become one of the hottest, most must-have perennial plants for today's gardens. Heucheras belong to the family Saxifragaceae, which includes many other popular perennials such as astilbe, berginia,...
August 22, 2002
We have been plagued with resistance problems in the ornamental industry for several years. My first exposure to resistance was when the leafminer, Liriomyza trifolii, became resistant to the broad spectrum of insecticides used in greenhouse...
August 22, 2002
The good guys, spray wand in hand, have finally chased away the deadly monsters. They have won the battle and are catching their breath when all of a sudden the monsters reappear, and they are off again, fighting for their livelihoods. Like the...
August 20, 2002
Have you every walked into a greenhouse early in the morning on a cool, crisp spring or fall day, slammed the door behind you and found yourself soaking wet? You look up to try to find the source of this indoor precipitation and see rows of big, fat...
August 09, 2002
Whiteflies can be very damaging to greenhouse crops and field and greenhouse-grown cut flowers because of their broad host range, resistance to insecticides and potential to vector a variety of plant virus diseases. High populations of whiteflies...
August 09, 2002
No, whiteflies are not flies. Flies like the typical housefly belong to the order Diptera, which has only two wings. Whiteflies are in the order Homoptera and have four wings. The order Homoptera also include cicadas, planthoppers, treehoppers,...
August 09, 2002
Though it presents some unique challenges, disease control of perennials is very similar to that of herbaceous annuals. Number one is knowing what diseases are important and how to identify them. Before you plant anything, be sure that the material...
August 09, 2002
With restricted re-entry intervals, and fear of resistance development, many growers are looking for alternative methods for controlling whiteflies, and some of them are turning toward biologicals. The most interesting new developments in biological...
July 09, 2002
Well, believe it or not, it’s time for another poinsettia season! Some of you are already tired of poinsettias, having done poinsettia stock plants since last spring. Other growers are just rooting bought-in cuttings and potting up finished...
July 09, 2002
The high cost of human health care, especially prescription medications, has led many of us to that very question. Can I use the generic, less-expensive product or must I purchase the name brand? Although we do not have true generics available for...
July 09, 2002
Poinsettias can, at times, be a problematic crop, but being aware of the more common nutritional, physiological and insect and disease-related problems encountered during production can help reduce the headaches. By watching for potential problems,...
June 11, 2002
There are over 30 cultivars of ornamental peppers available. Many of the older cultivars like ‘Filus Blue’ or ‘Bolivian Rainbow’ are tall-growing and make excellent background plants in the landscape. Plant breeders at the USDA in Beltsville, Md.,...
June 11, 2002
Are you looking for a new potted plant that doesn’t need pinching or disbudding; a fast crop for hanging baskets; an unusual plant to make your container gardens stand apart from the competition; top-quality plants that are easy to grow with no...