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June 11, 2008
When it comes to low-volume chemical application in the greenhouse, growers have a variety of options to choose from — from mist blowers to targeted low volume sprayers. Coverage is everything. Even the most effective new pesticide is useless unless...
April 11, 2008
Mealybugs are difficult to control because of their ability to reproduce rapidly and protection by a white waxy coat. At Longwood Gardens, we grow plants in a variety of indoor environments. There is a vicious cycle that exists between stock plants...
March 06, 2008
The term “weed” is purely an economic expression that means “a plant out of place.” If you don’t want a particular plant to grow in a given place, it is a weed. When growers talk about weeds, they generally refer to certain plant species, such as...
October 19, 2007
Leaves dropping off plants, brown blotches on leaves and stunted seedling: all telltale symptoms of downy mildew on coleus. Both seed and vegetatively propagated types are susceptible. The brown or blighted areas on diseased foliage have an...
October 19, 2007
Q What’s new in ornamental fungicides? A This is a question I am actually asked quite frequently and one I hate to hear because it makes me think. During the past year, we have seen two new products reach the U.S. market — FenStop and Insignia....
September 19, 2007
When it comes to selecting a miticide to control spider mites or “mites” in the greenhouse or outdoors, there is oftentimes confusion that all miticides are similar in terms of their use patterns and the range of mites that are controlled. However,...
September 19, 2007
Q When I make treatment decisions for mites, can I consider the Eriophyid mites and the Tarsonemid mites as if they are the same? A This is a very thoughtful question and shows the grower knew there was a difference between Eriophyids and...
February 26, 2007
The silverleaf whitefly, Bemisia argentifolii (which is synonymous with the sweet potato whitefly, Bemisia tabaci B biotype) and the twospotted spider mite, Tetranychus urticae, are major arthropod pests in greenhouses. Silverleaf whitefly and...
November 15, 2006
For the last few years, the prospects for new chemistries were rather bleak, so it finally feels good to have some hope. In addition, most of the new chemistries are reduce-risk or organophosphate (OP) replacement products. IR-4 (www.ir4.rutgers....
October 12, 2006
The concept of a clean growing facility is not new; however, in recent years, basic greenhouse and nursery sanitation has become a mainstay of everyday operations. Growers have seen two economically destructive diseases that have decimated crops and...
September 12, 2006
Pesticides are “formulated” in many ways, each with its own characteristics, to meet a wide array of pest control conditions/needs, application methods, applicator/environmental safety, handling/storage conditions and actual pesticidal...
August 15, 2006
Cultural control is often recommended as a strategy to avoid insect, mite and disease problems. Cultural control involves properly implementing irrigation and fertility practices and sanitation, including timely weed, plant and growing medium...
August 15, 2006
It used to be that poinsettia crops had relatively few pest problems, among them greenhouse whitefly and fungus gnats. I have also seen two spotted spider mite, citrus mealybug and brown soft scale on poinsettias, but only rarely. Usually, I would...
July 06, 2006
Over the past few years, we have seen many new active ingredients in fungicides for ornamentals. The new products I will be presenting in this article fall into chemical classes that we are familiar with — things like sterol inhibitors — as well as...
June 14, 2006
Today’s Internet is a gateway to an endless supply of information, and while this can be very helpful, it can also be daunting. Which Web site has the most accurate information? Which is the easiest to maneuver? Which provides the best information...
June 14, 2006
With its ease of production and ability to flower the first year, Coreopsis grandiflora ‘Sunfire’ is a great addition to spring perennial programs. ‘Sunfire’ produces an abundant supply of large, single, yellow blooms with burgundy-red centers, and...
June 05, 2006
Verbenas have a key position among bedding, hanging basket and container crops. They provide pure, bright colors or delicate, pastel shades and generally grow like gangbusters. This innate vigor protects them from some of the disease problems that...
March 23, 2006
Over the past 30 years, I’ve managed all kinds of greenhouses and a common characteristic has been their modest size — smaller or equal to 2,500 sq.ft. Insect problems can be challenging because a grower can experience multiple pest problems in...
December 13, 2005
Humidity levels in the greenhouse can be as important to growers as temperature. The problems associated with high humidity are well known: water dripping off the roof and walls and a high incidence of Botrytis, powdery mildew and other fungal...
December 13, 2005
The Technical Advisory Committee (TAC) was established to respond to requests by the Q biotype Whitefly Taskforce for technical information. The following are the marching orders given to the TAC by the Whitefly Taskforce. Technical experts with...